ADU-08e

Introduction

Performance Characteristics

The ADU-08e (Analog Digital Unit) is the core unit of the metronix multi-channel Geophysical Measurement System GMS-08. It is the result of more than 40 years of metronix´ experience in the design and manufacture of electromagnetic geophysical instruments.

The ADU-08e can be equipped with up to 6 measurement channels (5 + one internal wired). The standard configuration for wide band MT and AMT consists of 5 broad band (HF+LF combined on one board) channels. The type of channel-boards which are plugged-in will be detected by the system automatically. Multiple ADU-08e units can be connected to a network .

Each ADU can be operated as a stand-alone system, in a network using standard Local Area Network (LAN) using GigaBit Ethernet, or as part of an array, in which each unit is synchronized by its built-in GPS controlled precision clock. An access via Wireless-LAN is also possible.

The ADU-08e electronics is housed in a small (41cm x 32cm x 17cm) waterproof box only 6.5 kg in weight. In spite of the small size, it contains the complete circuitry for analog signal conditioning of up to 6 channels, 24(HF)/32(LF) Bit A/D conversion and data storage as well as a very precise GPS controlled time base (using GPS and GLONASS).

Data is stored on a removable SD card or on a USB pen drive orexternal USB hard-disk or, via the network, on the hard-disk of the connected control computer.

Either the single ADU-08e or a complete network of several ADUs can be controlled via a standard PC. This may be any (ruggedized) laptop with sufficient performance.

Each ADU can be accessed and controlled by any external PC using a standard Web-browser and aduclient software(Linux, Mac, Windows, Andoid).

All metronix magnetometers like MFS-05, MFS-06(e), MFS-07(e), FGS-02, FGS-03e, SHFT-02(e) can be connected directly to the ADU-08e. It is also possible to connect magnetometers from other companies on option.

The GMS-08 system provides a high degree of flexibility for various sensor setups. Due to its scalable and modular concept it can grow with the requirements of the user. The low number of different components also simplifies the spare part requirement.

Features

  • High data quality due to 24 Bit (HF) and 32 Bit (LF) Analog/Digital conversion technology

  • Very low system self-noise for best results in the MT “dead band”

  • Wide frequency range from DC to 250 kHz. Sampling rates from 256Hz up to 524kHz

  • System can be operated as a stand-alone or as a multi-channel network system when connecting multiple ADU-08e in a Local Area Network (LAN). An integrated W-LAN module is now standard.

  • ADU-08e is controlled by any Web-browser without need of further software

  • ADU-08e is controlled by mobile phone or tablet (adu client software)

  • Multiple stand-alone systems are synchronized with GPS clock accuracy.

  • Compatible with all metronix sensors.

  • Automatic unattended recording mode, pre-configured job-lists

  • Plug and Play recording mode if a USB stick with pre-programmed time schedule is inserted

  • Automatic detection of magnetometer type and automatic download of calibration function from sensor (Only for MFS-06e, MFS-07e, MFS-10e, SHFT-02e/03e, FGS-03e/04e and future sensors)

  • Automated system self-check of ADU-08e and sensors during set up.

  • Optional automatic input offset compensation eliminates self-potential of electrodes.

  • Real-time data processing on option (the capabilities of this feature will be further enhanced in future software releases).

  • 12 V battery powered. Only one battery is required for each ADU-08e incl. sensors.

  • Compact, light-weight, ruggedized and water-protected instrument design.

  • Low power consumption

  • Wide operating temperature range from -30°C to +60°C ambient temperature.

  • Multiple methods such as MT, AMT, EMAP, RMT, CSAMT

Technical Data

Frequency range

DC to 524.288 kHz

Number of channels

5 (standard) expandable to 6

Native sample rates of A/D converter

256 Hz to 524.288 kHz selectable by power of 2

(lower sampling rates by on-line digital filtering)

A/D conversion

LF: 32 Bit (data rate max. 4,096 samples/sec)

HF: 24 Bit (data rate max 262,144 samples/sec)

One A/D conversion unit for each channel

Input noise

LF-ADB: 12 nV/√Hz @ 0.1 < f < 2 kHz and gain 16

Ultra low noise mode LF: 6 nV/√Hz @gain 64

HF-ADB: 13 nV/√Hz @ f >1kHz and gain 16

Input resistance

>10 MΩ

Nominal input voltage range (@ gain 1)

switchable between +/- 1.25V and +/-10V

(is done automatically by selection of sensor type)

System computer

32 bit low-power embedded controller with Linux operating system (4 CPU cores)

Storage media

32 - 512 GByte SD card (4 TB on external USB disk with ext4), USB-pen-drive or other external USB mass storage device

Test facilities

Automatic power up self-test of all important system functions including sensors and display of result on the instrument. Automatic creation of log-file

Calibration

automatic calibration

Network connection

GBit Ethernet with RJ45 connector, external WiFi module

Synchronization

72 channels GNSS synchronized clock, accuracy +/-30ns rms accuracy of 1pps signal, station position is also determined and stored (GPS, Glonass, BeiDou, Galileo)

Standard connectors for 5 channel system

1 x Network RJ45 ruggedized socket(s)

3 x Magnetometer 10-pole

4 x E-field input terminal 6-pole

1 x GND terminal

2 x input terminals for 12V battery protected against reverse polarity

1 x ext. satellite antenna MCA-Type socket,

2 x USB2.0 Type A

Status Display

5 lines with 64 alpha numeric characters for display of status information and direct parameter entry

Case

ruggedized, water-resistant case

Weight

appr. 6.2 kg

External dimensions

406*330*174 mm3

Power Input

9V … 15V DC

Power consumption

5.5W – 15W

depending on operation mode

Operating temperature range

-30°C to + 60°C

The system is protected against over voltage; around 16.xx V it should switch off.
All components inside the system are industrial (-40°C .. +85°C) grade with the CPUs on the ADB and Clock/GPS even ranging up to 125°C. Lightning protection is up to 1200V, fuses can be exchanged. Above the system will be seriously damaged

Error Messages

Component

MainIndex

SubIndex

Priority

Message

DisplayMsg.

Description

MCP

1

1

e

meas started incompletely: invalid job file

Start failed: Invalid job

The new measurement job, that should be started, is erroneous. There are errors in the XML syntax or the description of the configuration of the hardware components. Please check your XML job file.

MCP

1

2

e

meas started incompletely: out of memory

Start failed: Out of memory

There is not enough system memory available to start a new measurement. Please stop other currently running measurements before trying to restart the measurement.

MCP

1

3

e

meas started incompletely: ADB sync failed

Start failed: ADB Sync failed

The synchronisation of the ADB boards failed. The recorded data of the single ADB channels may be out of synchronisation. This is a hardware problem. Please contact the Metronix support team.

MCP

1

4

e

disk error: could not write to disk

disk error: could not writeto disk

The ADU-07 system, was not able to write to the CF-card or attached USB stick. This may either happen, if you renamed or deleted ATS files for an active measurement, or there is no free disk space anymore. Please note, that the data series will possibly be corrupted from the time of occurrence of this message.

MCP

1

5

e

meas stopped unexpectedly: meas data error

Unexpect. stop:Measurement data invalid

During recording of data the last data buffers, that were received from the measurement hardware had unequal size for the different channels of the ADB boards. This may only happen, if a measurement stopped because it was either cancelled by you, it reached the “Start / Stop” fill level mark and was started in “Start / Stop mode” or it caused a buffer overflow on the SDRAM buffer on the measurement hardware. In all cases the last data buffer of the measurement (< 4 seconds of data series) may be corrupted.

MCP

1

6

e

meas stopped unexpectedly: buffer full on backplane - data ok

Unexpect. stop:Buffer full on backplane - ok

A measurement was stopped because a buffer overflow occurred in the SDRAM buffer on the measurement hardware. This may be caused, because you made measurements with to high sampling frequency over too long time.

MCP

1

7

i

stop time reached: still downloading data

Stop time reached: Still downloading
Measurement finished as scheduled, but the system is still downloading data. This may happen if using high frequencies where the recorded can not be stored to disk in time.

If you want to start a measurement on the same channels while the data download is not finished, the new measurement will not be started.

MCP

1

8

e

meas stopped unexpectedly: too early

Unexpect. stop:Too early

A measurement stopped , before it reached its desired stop time. This may not happen in normal operation and is an indication for a hardware problem. This should be examined together with the Metronix support team.

MCP

1

9

e

meas stopped unexpectedly: MCP internal error

Unexpect. stop:MCP internal error

This message indicates a problem in the handling of the measurement data in the ADU-07 system. This shall not occur in normal operation and can not be fixed by you. Please call the Metronix support team.

MCP

1

10

e

meas not started

Start failed: Measurement notstarted

This message says, that a measurement could not be started by the ADU-07 system. This may have different reasons. One could be, that all the channels, that are configured for the measurement, are still blocked by another measurement. Another reason could be an invalid hardware configuration fro the ADU-07 system.

MCP

1

11

i

meas ended

Meas. completedcorrectly

This message indicates the stop of a running measurement. The measurement index of the measurement is appended to this messages.

MCP

1

12

i

new meas started

Meas. started

This message indicated the start of a new measurement. The measurement index, that this measurement will have during its lifetime is appended to this message.

MCP

1

13

i

meas timed out

Meas. timed out

This message is created, if not all data of the measurement was received by the CPU board, before the stop time of the measurement was reached. The ADU-07 system will try to stop this measurement and read all lasting data from the SDRAM buffer on the measurement hardware.

MCP

1

14

e

system initialisation error: database

Init error: Database error

At start-up of the system the control program on the ADU-07 could not connect to the MySQL database. This problem could be caused by an database crash, for example if the system was switched off without shutting it down correctly. The database has to be repaired. Please contact the Metronix support team.

MCP

1

15

e

system initialisation error: hardware

Init error: Hardware error

One of the hardware components could not be initialised correctly at start-up of the ADU-07 system. The name of the hardware component is attached to this message. Please check your hardware for errors.

MCP

1

16

i

found new hardware

This message gives you the information, that a new hardware component was detected at start-up of the system. The name of the component is attached to this message.

MCP

1

17

e

meas data error: unequal buffer size due to hardware error

After receiving the last samples of a measurement the size of the buffers for the different channels of a measurement are not equal.

MCP

1

18

e

got data of idle channel

The CPU board reads samples for a channel, that is not recording data. This points to hardware problems or invalid configuration of the ADU-07 system. If this message occurs you must to wait until the backplane SDRAM buffer is empty again, before starting a new measurement. Otherwise the measurement data of the new measurement could be corrupted by old data of the last measurement.

MCP

1

19

i

unexpected MCP state

This is a collective message for unexpected states in the ADU-07 control program. Please send the message with its attached information to the Metronix support team.

MCP

1

20

e

meas started incompletely: inv. sample frequency

One of the channels, that should take part in the new measurement should us a sampling frequency, that is not supported by the according ADB board. The ADU-07 system will choose a fallback value instead.

MCP

1

21

e

data disk space smaller than 5MB

Disk space low

The free disk space on the data disk is smaller than 5 MByte. Please delete old measurement data or clear the “Error List” and “System History” to free up more disk space.

MCP

1

22

i

system is booting

Booting

This message informs you that the ADU-07 system is currently booting up

MCP

1

23

i

selftest is active

Selftest

This message informs you, that the ADU-07 system is currently executing selftest measurements. Attached to this message you can find the step, that is actually executed.

MCP

1

24

i

system is shutting down

Shutting down

This message informs you, that the ADU-07 system is currently shutting down.

MCP

1

25

i

system is sleeping

Sleeping

This message informs you, that the ADU-07 system is going into sleep mode.

MCP

1

26

i

system is ready

Idle

This message informs you, that the ADU-07 system was completely booted up and is ready to execute the selftest procedure.

MCP

1

27

i

system woke up

Woke up from sleep

This message informs you, that the ADU-07 system woke up from sleep mode.

MCP

1

28

e

system sleep error

Sleepmode error

This message informs you, that an error has occurred when entering or leaving the sleep mode.

MCP

1

29

e

meas started incompletely: some channels not available

Start failed: channels not available

This message says, that some of the channels, that should take part in the measurement are not available. This may happen, if they are either still blocked by another measurement, or if they do not support the sampling frequency, that shall be used in the measurement.

MCP

1

30

i

selftest result:

Selftest:

This message shows you the result of the selftest procedure. If it is OK, no problems occurred during selftest. If the result is “NOK”, please examine the selftest results in the “Selftest” page of the Webinterface. At least for one of the hardware components the “Init Error” or “ADB Error” field should show a value unequal 0. You will find the according message in this table in the row, that fits to the component and Subindex you find in the “Init Error” or “ADB Error” field.

MCP

1

31

i

meas cancelled by user

Meas. cancelled

This message informs you, that a running measurement was cancelled by the user. The measurement index of the measurement is attached to this message.

MCP

1

32

i

meas stopped manually

This message informs you, that after receiving the last samples of the measurement, the buffer were unequal of size. This happened, because you cancelled a running measurement. Please note, that the last few seconds (t < 4 seconds) of the time series are lost to avoid corruption of the measurement data.

MCP

1

33

e

OpenMT: socket interface could not be opened/created

This error occurs, if an OpenMT_DataInterface ProcessingObject was configured for the MCP ProcessingQueue and the socket connection could not be created/opened, using the port number that was configured in the XML job file. Maybe the port number is allready in use or there is no valid TCP/IP interface.

MCP

1

34

e

OpenMT: socket interface could not be closed/deleted

This error occurs, if the socket interface could not be closed. Normally this should not happen. The socket with this port number will not be available anymore until the system is rebooted.

MCP

1

35

e

OpenMT: error while sending data via socket interface

This error signals an problem while sending data on the socket interface to the client application. If this error occurs the data may be received incomplete at the receiver/client application. This may happen if for example the client application exits unexpectedly.

MCP

1

36

e

OpenMT: local OpenMT client could not be started

This error occurs if you configured the OpenMT_DataInterface in a way, that a local OpenMT client should be started. This way the data would be processed right on the local system. For some reason the client could not be started. This may happen for example, if the OpenMT executable is not located at “/mtdata/mcp_sys” or there are not enough system resources to start the client.

MCP

1

37

e

OpenMT: local OpenMT client could not be stopped

This error occurs, if the local OpenMT client could not be stopped at the end of the measurement. This may happen, if the OpenMT application allready exited due to some reason, or if OpenMT hang up. In this case the OpenMT process must be killed by hand before it should be started again.

MCP

1

38

i

sleep mode activated

The user has activated the “Sleep Mode”. The ADU-07 system will go to sleep, if this is possible. This will set the CPU board to “Suspend To RAM”. If sleeping, the system is not accessible via the Webinterface anymore.

MCP

1

39

i

sleep mode deactivated

The user has deactivated the “Sleep Mode”. The ADU-07 system will not go to sleep anymore.

MCP

1

40

i

resetting sleep mode config

The user has reset the “Sleep Mode” configuration. Therefore the “Sleep Mode” will be deactivated and furthermore all “Wake Up Periode” will be deleted.

MCP

1

41

i

W-LAN was activated

W-LAN was activated

The W-Lan module was activated.

MCP

1

42

i

W-LAN was deactivated

W-LAN was deactivated

The W-Lan module was deactivated.

MCP

1

43

i

system is rebooting

Rebooting

The system is rebooting.

MCP

1

44

i

AutoCorr: Switched Gain

AutoCorr: Switched Gain

The AutoCorr Processing Object switched the gain for a channel to another value than the one that was used at start-up of the job. This may happen, either because the initial gain settings have been too conservative (switch to higher gain), or because the ADB board is near to be overpowered (switch to smaller gain).

MCP

1

45

i

AutoCorr: Switched DC offset correction

AutoCorr: Switched DC offset correc- tion

The AutoCorr Processing Object switched the DC offset corerction for a channel to another value than the one that was used at start-up of the job. This may only happen, if the DC offset of the time series reaches a value bigger/smaller than +/-400mV. In this case the ADB board is in danger to be overpowered.

MCP

1

46

e

disk error: 1 or more partitions are damaged and must be repaired

disk error: internal SD/CF card is damaged!

The ADU-07e system detected a damaged file system on 1 or more partitions of the internal CF/SD card. Please check the CF/SD card and try to repair the disk, e.g. by re-creating the system disk, using the Metronix update tool. If this problem should occur again afterwards, the disk may have reached its End Of Lifetime and MUST be replaced!

MCP

1

47

e

disk error: target disk is full - stopping jobs recording on this disk

disk error: almost full -> stopping jobs

The target disk is almost 100% full. The ADU-07e system is stopping all jobs that are recording data to this disk.

MCP

1

48

e

disk error: no USB mass storage device mounted - using internal disk instead of

disk error: no USB mounted using int. disk

Data should be recorded to external USB mass storage device mounted to ADU, but no device could be found when the job was started. Maybe the USB devices was detached. Recording to internal disk now instead of external USB device.

MCP

1

49

e

Ejecting TS Data SD-Card
The customer asked the ADU system to eject the TS data SD-Card. If failed, check the SD-Card. Maybe it is already ejected or no SD-Card is inserted into ADU system.

Note that without TS data SD-Card installed the disk space for TS data is very limited. Always make sure that a TS data SD-Card is inserted if a job is started / running.

MCP

1

50

e

Inserting TS Data SD-Card

The customer asked the ADU system to detect/insert a new TS data SD-Card. If this fails, check, if the inserted SD-Card is OK and contains a valid/supported file system, such as EXT-3, EXT-4 or FAT (including exFAT).

MCP

1

51

e

Formating TS Data SD-Card

The customer asked the ADU system to format the currently plugged in Frontpanel SD-Card where all TS data is stored on. All data on the SD-Card will be deleted and the SD-Card will be created with 1 single EXT4 partition.

MCP

1

52

e

No TS Data SD-Card inserted - job will NOT be started

There is no TS Data SD-Card plugged in on Frontpanel. The ADU system will not start the recording as there is no disk space available for the data.

MCP

1

53

e

TS Data SD-Card failed - system will reboot

During operation severe problems arose with the Frontpanel TS Data SD-Card. It failed and is not accessible anymore. The ADU System will reboot itself to try to go back to normal operation. Currently running jobs will be continued after reboot. If this problem occurs again, the Frontpanel TS Data SD-Card MUST be exchanged.

MCP_USB

2

1

e

USB communication timeout

This message advises you, that problems occurred in USB communication between the measurement hardware and the CPU board. This may either be caused by a missing USB connection between CPU board and measurement hardware or hardware problems on this components. Please check your hardware.

MCP_USB

2

2

e

USB driver error

This message says, that the control program has problems with connecting to the USB driver. The reasons may be the same as in the prior message. Additionally there can be problems with the Linux system. Please check your hardware. If everything is OK with the hardware, call the Metronix support team.

MICRO

3

1

e

meas not started: hardware error

Start failed: Hardware error

A measurement could not be started due to problems with the measurement hardware. Please check your hardware.

MICRO

3

2

e

all meas stopped: HW error - data corruption

Unexpect. stop:HW error on backplane

A buffer overflow occurred on the measurement hardware. Therefore all measurements are stopped.

MICRO

3

3

e

Backplane SW: GPS - buffer overflow

An internal buffer overflow occurred in the measurement hardware when accessing the GPS board. This may not happen in normal operation and points to a problem with GPS board. Pleas contact the Metronix support team.

MICRO

3

4

e

Backplane SW: GPS - no Linefeed in GPS sentence

This message occurs, if the data from the GPS board is corrupt. This may happen, if the GPS board is defect or not attached correctly into the slot.

MICRO

3

5

e

Backplane SW: GPS - Timeout in interface - ignore during boot or reset of GPS

This message occurs, if the data from the GPS board is corrupt. This may happen, if the GPS board is defect or not attached correctly into the slot. The message may occur once after start-up of the system.

MICRO

3

6

e

Backplane SW: 5Volt supply fail

This message says, that the 5Volt power supply on the measurement hardware failed. This is a hardware problem. The message may occur once after start-up of the system as at that time the power supply is not fully powered up.

MICRO

3

7

e

Backplane SW: internal error

This is a collective message for the micro controller on the measurement hardware. Please send this message with its attached information to the Metronix support team.

HW_MSG

4

1

i

battery voltage switched to FAIR

Battery FAIR!

The battery voltage switched from GOOD to FAIR. Please check the battery and change it to a new one.

HW_MSG

4

2

e

battery voltage switched to LOW

Battery LOW!

The battery voltage switched from FAIR to LOW. Battery power is now critical and the battery has to be exchanged immediately.

HW_MSG

4

3

e

battery voltage critical: shutting down

Power critical!Shutting down!

The critical battery voltage forced the ADU-07 system to shut down. This functionality is not implemented yet.

HW_MSG

4

4

e

temperature over maximum: shutting down

Temp. critical!Shutting down!

The internal temperature exceeded the maximum value. The system is shutting down. This functionality is not implemented yet.

HW_MSG

4

5

e

temperature under minimum: shutting down

Temp. critical!Shutting down!

The internal temperature exceeded the minimum value. The system is shutting down. This functionality is not implemented yet.

HW_MSG

4

6

e

detected BAD DATA!

Detected BAD DATA!

The CEA “Bad Data” Selftest Step detected bad data in one of the channels. The user should check the complete set-up for this channel (ADB Board - Cable - Sensor). It may be that either the E-Field cables have been cut, or one of the other sensor cables or sensors is broken.

GPS_MSG

5

1

e

GPS board not responding

GPS board not responding

This functionality is not implemented yet.

GPS_MSG

5

2

e

unknown GPS board

During start-up of the ADU-07 system an invalid GPS board was found, that is not supported by the system. Please check you GPS hardware.

GPS_MSG

5

3

i

GPS lost sync

The ADU-07 system lost the synchronisation to the GPS signal. This means, that the state switched from “G3fix - fully synced” to a lower state.

GPS_MSG

5

4

i

GPS gained sync

The ADU-07 system gained a full sync to the GPS signal. If this happens, the ADU-07 system time is synchronised to the GPS time. Even if the system looses the sync afterwards, the system is still synchronised.

GPS_MSG

5

5

i

GPS: no antenna connected

This functionality is not implemented yet.

GPS_MSG

5

6

i

GPS: no satellites found

This functionality is not implemented yet.

GPS_MSG

5

7

i

GPS: insufficient satellites for sync

This functionality is not implemented yet.

GPS_MSG

5

8

e

GPS: no time synchronisation

This functionality is not implemented yet.

GPS_MSG

5

9

i

GPS: toggled Dynamic Mode

GPS: toggled dynamic mode now

The Dynamic Mode of the GPS board was switched from stationary to moving, or vice versa.

BACK_MAIN

6

1

e

main backplane not responding

The main backplane board could not be initialised. Pleas check your hardware.

BACK_MAIN

6

2

e

unknown main backplane type

Main backplane:Unkown type

The ADU-07 system, found an invalid main backplane board that is not supported by the system.

BACK_MAIN

6

3

e

main backplane could not be booted

The controller on the main backplane board could not be booted. This could be caused by an unknown hardware component.

BACK_MAIN

6

4

e

status display not accessible

This functionality is not implemented yet.

SUB_BACK

7

1

e

sub backplane not responding

Sub backplane: No response

The sub backplane board could not be initialised. Please check your hardware.

SUB_BACK

7

2

e

unknown sub backplane type

Sub backplane: Unknown type

The ADU-07 system, found an invalid sub backplane board that is not supported by the system.

SUB_BACK

7

3

e

sub backplane could not be booted

Sub backplane: Boot error

The FPGA on the sub backplane board could not be booted. This could be caused by real hardware problems on the sub backplane board or an unknown sub backplane board.

CAL

8

1

e

cal. board not responding

CAL board: No response

The calibration board could not be initialised. Please check your hardware.

CAL

8

2

e

unknown cal. board

CAL board: unknown type

The ADU-07 system, found an invalid calibration board that is not supported by the system.

ADB

9

1

e

ADB board not responding

ADB board: No response

The ADB board could not be initialised. Please check your hardware.

ADB

9

1

e

unknown ADB type

The ADU-07 system, found an invalid ADB board that is not supported by the system.

ADB

9

2

e

invalid ADB configuration

During the configuration phase for a new measurement the ADB board should be started with a configuration, that is not supported by this ADB board. The measurement will be started using fallback values. The changed configuration is attached to this message. Please check your measurement configuration.

ADB

9

3

e

ADU07-ADB-LF: internal DC offset failure

The internal DC offset on the ADB board is too high and can not be corrected. This points to a hardware problem with the ADB board in this channel. Please check the hardware for errors.

ADB

9

4

e

ADU07-ADB-LF: internal gain correction error

The internal gain correction on the ADB board failed and is out of range. This points to a hardware problem with the ADB board in this channel. Please check the hardware for errors.

ADB

9

5

e

ADU07-ADB-LF: gain out of range 1:1

The gain for combination “gain stage 1 = 1”, “gain stage 2 = 1” is out of range. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

6

e

ADU07-ADB-LF: gain out of range 8:8

The gain for combination “gain stage 1 = 8”, “gain stage 2 = 8” is out of range. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

7

e

ADU07-ADB-LF: gain out of range 1:64

The gain for combination “gain stage 1 = 1”, “gain stage 2 = 64” is out of range. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

8

e

ADU07-ADB-LF: gain out of range 64:1

The gain for combination “gain stage 1 = 64”, “gain stage 2 = 1” is out of range. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

9

e

ADU07-ADB-LF: external offset correction error

The external offset correction on the LF ADB board failed. This points to hardware problems with the offset correction DAC on the ADB board. Please check the hardware.

ADB

9

10

e

ADU07-ADB-LF/MF: 4Hz low pass filter error

The attenuation of the 4 Hz low pass filter on the LF/MF ADB board is out of range. This points to hardware problems with the 4 Hz LP filter on the ADB board. Please check the hardware.

ADB

9

11

e

ADU07-ADB-LF: noise out of range

The noise on the sensor input is out of range. Please activate the 4 Hz low pass filter for noise reduction, if possible and check the sensor connection.

ADB

9

12

e

ADU07-ADB-LF: DC level too high for gain

ADB: DC level too high

The DC level on the sensor input is too high for a amplification. Therefore do not use the gain stages other then 1:1. Otherwise the input signal will exceed the maximum dynamic range of the channel and the measurement data will be useless.

ADB

9

13

e

ADU07-ADB-HF: internal DC offset failure

The internal DC offset on the ADB board is too high and can not be corrected. This points to a hardware problem with the ADB board in this channel. Please check the hardware for errors.

ADB

9

14

e

ADU07-ADB-HF: internal gain correction error

The internal gain correction on the ADB board failed and is out of range. This points to a hardware problem with the ADB board in this channel. Please check the hardware for errors.

ADB

9

15

e

ADU07-ADB-HF: gain out of range 1:1

The gain for combination “gain stage 1 = 1”, “gain stage 2 = 1” is out of range. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

16

e

ADU07-ADB-HF: gain out of range 8:8

The gain for combination “gain stage 1 = 8”, “gain stage 2 = 8” is out of range. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

17

e

ADU07-ADB-HF: gain out of range 1:64

The gain for combination “gain stage 1 = 1”, “gain stage 2 = 64” is out of range. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

18

e

ADU07-ADB-HF: gain out of range 64:1

The gain for combination “gain stage 1 = 64”, “gain stage 2 = 1” is out of range. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

19

e

ADU07-ADB-HF: 1Hz high pass filter error

The attenuation of the 1 Hz high pass filter on the LF ADB board is out of range. This points to hardware problems with the 1 Hz HP filter on the ADB board. Please check the hardware.

ADB

9

20

e

ADU07-ADB-HF: noise out of range

The noise on the sensor input is out of range. Please check the sensor connection.

ADB

9

21

e

ADU07-ADB-HF: DC level too high for gain

ADB: DC level too high

The DC level on the sensor input is too high for a amplification. Therefore do not use the gain stages other then 1:1. Otherwise the input signal will exceed the maximum dynamic range of the channel and the measurement data will be useless.

ADB

9

22

e

ADU07-ADB-COMMON: sync failed

ADB: sync error

The synchronisation of the single ADB boards before a measurement failed. Therefore the single channels of the measurement may jitter by the t = 1/Sample Frequency. This points to a hardware problem. Please check the ADB board for errors.

ADB

9

23

e

ADU07-ADB-MF: 500Hz high pass filter error

The attenuation of the 500 Hz high pass filter on the MF ADB board is out of range. This points to hardware problems with the 500 Hz HP filter on the ADB board. Please check the hardware.

ADB

9

24

e

ADU07-ADB-MF: gain out of range 4:16 (LF)

The gain for combination “gain stage 1 = 4”, “gain stage 2 = 16” is out of range on the LF input circuitry for the ADU07-ADB-MF board. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

25

e

ADU07-ADB-MF: gain out of range 16:4 (LF)

The gain for combination “gain stage 1 = 16”, “gain stage 2 = 4” is out of range on the LF input circuitry for the ADU07-ADB-MF board. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

26

e

ADU07-ADB-MF: gain out of range 4:16 (HF)

The gain for combination “gain stage 1 = 4”, “gain stage 2 = 16” is out of range on the HF input circuitry for the ADU07-ADB-MF board. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

27

e

ADU07-ADB-MF: gain out of range 16:4 (HF)

The gain for combination “gain stage 1 = 16”, “gain stage 2 = 4” is out of range on the HF input circuitry for the ADU07-ADB-MF board. This points to a hardware problem. Please check the selftest results for this step.

ADB

9

28

e

ADU07-ADB: Gain Correction factors out of date -> updated now

ADB: Gain Corr Out Of Date updated now!

The Gain Correction factors that are stored inisde the ADB EEPROMs is out of date. A re-calibration of the Gain Stages should be done by executing the according selftest steps.

ADB

9

29

e

ADU07-ADB: Gain Correction factors are invalid. Using Defaults (1.0).

ADB: Gain Corr Invalid

The Gain Correction factors that are stored inside the ADB EEPROMs are invalid (either because the Cal File is damaged or the File does not fit to the ADB Board type). In either case the Gain Stages need to be re-calibrated executing the according selftest steps. In the meantime all correction factors will be set to 1.0.

ADB

9

30

e

ADU07-ADB: Calibration of Gain Stages failed

ADB: Calibra tion of Gain Stages failed

The Calibration of the Gain Stages failed. The Gain Correction factors are propably invalid now. The Calibration should be re-started. If it fails again a HW problem occured.

ADB

9

31

e

ADU07-ADB: Gain Correction factor out of tolerance window

ADB: Gain Corr.Factor Out Of Range

The determined Gain Correction factor for a certain Gain Stage is out of range. This points to a HW error on the ADB board.

ADB

9

32

e

ADU07-ADB: Unknown error in Gain Stage calibration

ADB: Gain Corr Invalid

An unknown error occured during the calibration of the gain stage. This should not happen. Nothing can be done by the user.

ADB

9

33

e

Unified Fast Selftest cannot be executed on MF board.

ADB: Unified Fast Selftest does not work on ADU07-ADB-MF

The Unified Fast Selftest does not work on the ADU07-ADB-MF board. Please use another selftest mode.

ADB

9

34

e

Detection of LF LSB failed

ADB: Detection of LF LSB failed

The detetcion of the LF LSB failed. This points to a hardware problem, either with the ADB board, or the Calibration part of the Clock/GPS board.

ADB

9

35

e

Detection of HF LSB failed

ADB: Detection of HF LSB failed

The detetcion of the HF LSB failed. This points to a hardware problem, either with the ADB board, or the Calibration part of the Clock/GPS board.

ADB

9

36

e

probe resistance out of range - check electrode and cable

ADB: probe re- sistance out ofrange

The detetcion of the probe resistance failed. Check the E-Field cable or E-Field probe.

ADB

9

37

e

Magnetic Field sensor check failed - check sensor and cable

ADB: Check of Magnetic field sensor failed

The check of the magnetic field sensor failed. It shows wrong phase / amplitude values. Please check the connected Magnetic Field sensor ans sensor cable.

ADB

9

38

e

Gain Stage amplification on ADB is out of range - hardware error

ADB: Gain Stage out of range

The gain amplification for the Gain Stage on the ADB board is out of range. This points to an hardware problem, either with the ADB board or the calibration board.

ADB

9

39

e

Input Divider do not work correctly - hardware error

ADB: Input Divider error

The Input Divider that configure the ADB board to work as E-Field or H-Field channel, do not work correctly. This points to a problem with the ADB board (hardware error).

ADB

9

40

e

Radio Filter do not work correctly - hardware error

ADB: Radio Filter error

The Radio Filter on the ADB board to not work correctly. This is caused by a hardware error on the ADB board. As a result the recorded time series may be overpowered, if you record data in high noise environment (e.g. close to radio transmitters, power lines, …).

ADB

9

41

e

Probe Resistance is too high - check electrode and cable

ADB: Probe Re- sistance too high

The Probe Resistance that has been detected during selftest is too high. This points to either a broken E-Field cable or a broken probe. The E-Field probe and cable for the according channel should be checked, unless the measurement is done on very resitive ground.

ADB

9

42

e

Probe Resistance big anisotropy between Ex and Ey - check elecrode and cable

ADB: Probe Re- sistance big anisotropy

There is a big anisotropy in Probe Resistance between Ex and Ey channels. Unless the measurement takes place ground with very different resistance values for Ex and Ey the electrodes and cables should be checked. Likely they are broken for either Ex or Ey or one of the directions has bad connection to the ground.

GPS_STATUS

10

1

i

GPS Status report

This message shows a GPS status report.

HW_STATUS

11

1

i

HW status report

This message shows a hardware status report containing the actual battery voltage, current and status and other values.

GLOBAL

12

1

e

unknown system identity

GLOBAL: unknownsystem info

This message says, that the measurement contains an invalid system identity, that is not supported by the ADU-07 system. Please check your hardware.

USB_AUTOMOUNTER

13

1

i

USB: scanning device

USB: scanning device

This message says, that a new USB mass storage device was attached and is scanned by the USB Automounter. The USB Automounter will try to mount the device to ist target directory and start any job-lists, if configured.

USB_AUTOMOUNTER

13

2

i

USB: mounting device

USB: mounting device

The device is mounted to the configured target directory.

USB_AUTOMOUNTER

13

3

i

USB: submitting job

USB: submittingjob

The job of the job-list was submitted to the ADU-07(e) internal job table.

USB_AUTOMOUNTER

13

4

e

USB: mounting of device failed !

USB: mounting of device failed

It was tried to mount the device to ist target directory, what failed. Maybe the configured target directory inside the “ADU07Conf” XML file is invalid. Please check the configuration file.

USB_AUTOMOUNTER

13

5

e

USB: start of job failed

USB: starting of job failed

It was tried to start the XML job. This failed. The reason may be that there is no valid XML job file at the location specifed in the ADU07Conf XML file.

USB_AUTOMOUNTER

13

6

e

USB: scanning of device failed

USB: scanning device failed

The newly attached USB device was tried to be scanned by the USB Automounter. This failed. The reason can be that there was no preconfigured directory strutcture or now valid ADU07Conf XML file.

USB_AUTOMOUNTER

13

7

i

USB: device was detached

USB: device wasdetached

An attached USB device was detached again.

USB_AUTOMOUNTER

13

8

i

USB: job-list transferred completely

USB: job-list transferred completely

All jobs of an job-list from an USB device have been transferred completely to the “jobs” table.

USB_AUTOMOUNTER

13

9

i

USB: script was executed correctly

USB: script executed correctly

A script of the script-list inside the ADU07Conf XML file was executed correctly.

USB_AUTOMOUNTER

13

10

i

USB: execution of script failed

USB: script execution failed

The execution of a script defined inside the ADU07Conf XML file failed. Check the script that should be started.

USB_AUTOMOUNTER

13

11

i

USB: script-list executed completely

USB: scipt-listexecuted completely

All scripts of the script-list have been executed.

CON

14

1

i

connector not responding

Connector boardNo response

The connector board could not be initialised. Please check your hardware. If you have an ADU-07 system with old, revision 1.0 connector board this is no problem (Revision 2.0 available since ADU-07e).

CON

14

2

e

unknown connector type

Connector boardUnknown type

The ADU-07 system, found an invalid connector board that is not supported by the system.

CON

14

3

e

failed to configure sensor input dividers

Connector boardFailed to set input dividers

When starting a measurement the ADU-07e system failed to correctly configure the sensor input dividers. This probably is a hardware error on the Connector Board. As a result the sensor input dividers may either be set to 1 or 8 with may result in a time series amplitude beeing to high or low (depending on the sensor type).

SENSOR

15

1

i

no plug and play sensor found

Sensor: No PNP sensor found

The sensor on the specific input could not be initialised. Please check your hardware. If you there is no MFS-06e, MFS-07e or EFD-07e sensor connected, this is no problem.

SENSOR

15

2

e

unknown sensor type

Sensor: Unknown type

The ADU-07 system, found an invalid connector board that is not supported by the system.

SENSOR

15

3

i

invalid XML cal file

Sensor: invalid XML CALfile

The ADU-07 system, found an new, intelligent sensor but was unable to read the sensors XML cal file from it. This may either be caused ba the XML cal file beeing broken, or by the sensor having no XML cal file stored inside ist EEPROM at all. This is cirtical. The sensor will operate properly. If you want to recalibrate the sensor, please contact the Metronix support team.

SENSOR

15

4

i

read XML cal file from sensor

Sensor: read CAL file

The ADU-07 system, found an new, intelligent sensor and successfully read a XML cal file from ist internal EEPROM. The file is stored inside the local database and will be used for all further measurements along with this sensor.

USER

16

1

i

user msg.:

User MSG:

This is a user specific message. It is not created by the ADU-07 system, but by the customer who configured the system.

PWR_STAGE

17

1

i

power stage not responding

Power Stage No response

The connected Power Stage (ARS2000 drive) could not be detected during boot-up of the system.

PWR_STAGE

17

2

e

unknown power stage type

Power Stage Unknown type

During boot-up of the system a Power Stage was detected, but its type information is invalid.

PWR_STAGE

17

3

e

Power Stage error: check manual -

Power Stage error:

Internal error of the Power Stage has occured. Check the TXM-22 manual for a detailed description of the error.

PWR_STAGE

17

4

i

Cleared Power Stage error:

Cleared Power Stage error:

An active error of the Power Stage was cleared.

PWR_STAGE

17

5

e

Undervoltage Power Stage: check power supply

Undervoltage Power Stage

During operation the DC link voltage of the connected Power Stage drop beneath the minimum value. Please check the power supply for the Power Stage.

PWR_STAGE

17

6

e

Overvoltage Power Stage: check braking resistor and operation mode

Overvoltage Power Stage

During operation the DC link voltage of the connected Power Stage exceeded the maximum value. Please check the braking resistor and the operation mode (output frequency and current).

PWR_STAGE

17

7

e

Overtemperature Power Stage: check cooling

OvertemperaturePower Stage

During operation the Power Stage temperature exceeded the maximum value. Please check the cooling of the Power Stage.

PWR_STAGE

17

8

e

Short Ciurcuit in Power Stage: check electrodes and cables

Short Circuit Power Stage

The output of the Power Stage is short circuited. Please check the electrode and cables.

PWR_STAGE

17

9

e

Overload of Power Stage: check operation mode

Overload Power Stage

The Power Stage was overloaded. Please check your operation mode and if needed, reduce the output current.

PWR_STAGE

17

10

e

Failed to load DC link of Power Stage

Failed to load DC link of Power Stage

The DC link of the Power Stage cannot be loaded. Please check the braking resistor and power supply.

PWR_STAGE

17

11

e

Failed to reset Power Stage

Failed to resetPower Stage

The reset of the Power Stage failed. Check the communication interface to the Power Stage (cables).

PWR_STAGE

17

12

e

Failed to acknowledge error in Power Stage

Failed to ack. errors in PowerStage

The acknowledge of errors inside the Power Stage failed. Check the communication interface to the Power Stage (cables).

PWR_STAGE

17

13

e

Failed to enable Power Stage

Failed to enab.Power Stage

The Power Stage can not be enabled. Check power supply and hardware enable signals.

PWR_STAGE

17

14

e

Failed to disable Power Stage

Failed to disable Power Stage

The Power Stage can not be disabled. This is a serious problem. Check the communication cables.

PWR_STAGE

17

15

i

Detecting electrode coupling

Detecting Elec trode Coupling

The TXM-22 started to detect the electrode coupling.

PWR_STAGE

17

16

e

Failed to detect the electrode coupling

Failed to de tect Electrode Coupling

The Power Stage failed to detect the electrode coupling. As a result no signal can be fed into the ground in a correct manner. Please check the electrode coupling.

PWR_STAGE

17

17

e

Emergency Shutdown Active

Emergency Shut down Active

An Emergency Shutdown occured. The Power Stage was switched off therefore. Please check the Power Stage condition and find out the reason for the Emergency Shutdown. Afterwards release the Emergency Switch.

PWR_STAGE

17

18

i

Emergency Shutdown was Cleared

Emergency Shut down was clear ed

The Emergency Shutdown cleared. The Power Stage is ready for operation again.

PWR_STAGE

17

19

e

Lost Connection to Power Stage

Lost Connect tion to Power Stage

The Connection to the Power Stage was lost. No communication can be done between TXB-22 and TXM-22 anymore. Please check the cabling between the two devices.

PWR_STAGE

17

20

i

Reconnected to Power Stage

Reconnected to Power Stage

The connection to the Power Stage was established again. The system is now working correctly again.

PWR_STAGE

17

21

i

Power Stage Output was enabled

Power Stage Output was enabled

The Power Stage Output was enabled and is now outputting signal waveforms.

PWR_STAGE

17

22

i

Power Stage Output was disabled

Power Stage Output was disabled

The Power Stage Output was disabled and is not outputting signal waveforms, even if a job is running. The output current is hardly set to 0.

PWR_STAGE

17

23

e

Sequence Config Error: Base Frequency is 0Hz

Seqc. Config Error: Base Frequency = 0Hz

The configured Sequence is invalid. The base frequency for the output signal was set to 0Hz. This is no valid value. The execution of the Sequence (Joblist) will be stopped.

PWR_STAGE

17

24

e

Sequence Config Error: Rotation Frequency is 0Hz

Seqc. Config Error: RotationFrequency = 0Hz

The configured Sequence is invalid. The “Rotating Dipole” or “Alternating Dipole” functionality is active AND the rotation frequency is set to 0Hz. The joblist will be started, but before a output signal is generated, the error must be acknowledged. The output signals current dipole will not be rotated or alternated.

PWR_STAGE

17

25

e

General Config Error: Invalid Operation mode

General Config Error: Invalid Operation Mode

The configured Sequence is invalid. An invalid operation mode was configured. E.g. in the current version the “HF” mode is not available. The joblist will be started in LF mode instead with the fastest possible output signal frequency.

PWR_STAGE

17

26

e

Invalid FW Version: TXM-22 Operation stopped

Invalid FW Ver sion: Operationstopped

When initialising the ARS2000 (TXM-22 Power Stage) and invalid or not supported FW version was detected inside the Power Stage. For security meanings the operation of the TXM-22 system was stopped. No jobs can be started. Check the Power Stage FW version on the “Hardware Config” page of the User Interface and ask Metronix for support.

PWR_STAGE

17

27

i

Testfirmware was found inside Power Stage

Test FW Versionwas found in Power Stage

A Test FW version was found inside the connected TXM-22 Power Stage. This should only occur in prototypes. As the FW version is marked as Test FW and therefore as untested undefined behaviour may occur. Please inform Metronix of this issue. If Metronix says the FW can be used, this message can be ignored. Otherwhise a FW update with the lates released FW should be done.

GSM

18

1

e

invalid phone number

GSM: invalid phone number

When trying to sent a new status SMS the configured phone number was invalid. As a result the SMS was not sent to the recipient.

GSM

18

2

i

Sending new status SMS

A new status SMS was sent.

GSM

18

3

i

Communication error with GSM modem

A communication error with the GSM modem occured.

Overview

The ADU-08e comes in a waterproof, ruggedized Peli case housing.

adu-08e

The ADU-08e is delivered along with an additional external GPS-antenna and two battery cables.

Figure 3 2 and 2-3 show the ADU-08e and its operating elements. All operating elements are numbered and described in more detail in the following pages.

adu-08e

Operating elements of ADU-08e front-panel

  1. USB Socket

  2. GPS Status LED

  3. Recording Status LED

  4. Battery Status LED

  5. GPS antenna

  6. Binding posts for auxiliary power supply

  7. Key pad

  8. On/Off button

  9. Slot for SD card

  10. Display

  11. Bridge for internal or external GPS Antenna, left is external, right is internal antenna (as shown in the picture)

../../_images/operating_elements_left_side.jpg

Operating elements of ADU-08e left side

  1. Network socket

  2. USB socket

  3. GPS antenna socket

  4. Battery sockets

../../_images/operating_elements_right_side.jpg

Operating elements of ADU-08e right side

  1. E-field connectors

  2. GND socket

  3. Magnetometer connectors

USB Type “A” Connectors

You will find one USB Type A connector on the front lid and another one on the left side for connection of USB mass storage devices or USB WiFi stick. Mass-storage devices and WiFi sticks will be recognized by the operating system automatically.

GPS status LED

This LED shows 3 states:

../../_images/led_off.png

LED off

No GPS synchronization or system in clock hold mode.
../../_images/led_blink.png

LED blink

System has detected sufficient number of satellites, but has not reached the maximum accuracy yet.
../../_images/led_steady_green.png

LED steady green

GPS locked and system fully synchronized.

If the LED is not illuminated despite the GPS-antenna is corrected properly, it may be that the antenna does not have an open view to the sky allowing the system to detect at least 4 satellites in track. In this case it may be helpful to look for another location for the antenna.

If the ADU has been transferred to another location which is far away from the last one with a valid GPS lock (more than 300 km), it can take a while until the system has found a sufficient number of satellites. In this case the stored Almanac of the satellite positions is no more valid for the new location and has to be updated first. This procedure can take up to 15 minutes.

It also may take a longer time if a long time span (more than 1 week) has been passed since the last GPS fix.

Recording status LED

The red LED is switched on if a data acquisition is running.

Battery Status LED

In order to get a quick check of the battery voltage without a laptop connected, this LED is provided. The meaning of the different colors is:

../../_images/battery_good.png

Battery good (voltage higher than 12.0V, fully charged)
../../_images/battery_voltage_fair.png

Battery voltage fair (<12.0V and >10.5V)
../../_images/battery_low.png

Battery low (voltage < 10.5 and > 10.0V) shutdown will come soon.
../../_images/system_shutdown_jobs_closed.png

The system has shut down and closed all running jobs automatically.

The exact battery voltage and current are also shown on the status display and it is monitored in the log file. If the battery voltage gets low, the ADU will shut-down automatically.

GPS Antenna

The built-in GPS antenna receives the signals from the satellites. It needs to have view to the open sky. In case the built-in antenna is used, the ADU may not be installed in a metal box.

Binding Posts for Auxiliary Power Supply

Here a 9 to 15V power source can be connected in order to power the ADU-08e.

Button On / Off

Pushing this button will start the instrument if connected to a power source. In order to shut down a running instrument press the button for a longer time (5 seconds) until you see the shut-down message in the display. Confirm the shut-down and wait for about 30 seconds until the ADU switches off.

On a running system this button is also used to activate a dark status display.

Slot for SD card

Here an SD card can be inserted. It is used for data storage and can have a size up to 200 GByte presently. The size delivered on standard is 32 GByte.

Alpha Numerical System Status Display

The display shows the status of the system after self-test and many other important parameters and information. The display is switched off automatically after a period of 30 seconds in case no button is pushed. In order to switch it on again you need to press the “On” button (8).

Battery Connectors

The ADU-08e is equipped with 2 battery sockets. You can connect a 12V battery or two batteries in parallel for extended operation time. Before the delivered battery cable can be connected, you have to remove the protection cap of the socket. The input voltage is 12 V nominal; the allowed voltage spans from 10.5V to max. 16V.

The inputs are protected against wrong polarity and over and under voltage. If the ADU should not work, check for wrong polarity or wrong voltage. If the instrument shall be operated without interruption, you may use the second battery input to connect a fresh battery. After having it connected, you may disconnect the old battery from the ADU-08e for recharging. An auxiliary 3rd battery input is provided on the front-panel. Here for instance a small Gel- or Li-Ion battery can be connected in order to provide a continuous power-supply when the system is transported to the next site. It may especially be helpful when the distance between two sites is only a few hundred meters as it could be the case in small scale AMT or RMT surveys.

Antenna socket for external GPS antenna

The ADU comes with a built-in GPS antenna which is sufficient for most cases. We also deliver a second external antenna which may be used in difficult reception situations or when the ADU is housed in a metal case. In this case the cable bridge has to be plug into position EXT.

Socket for Network

The network cable is connected to this socket (RJ45 type).

USB socket

A USB device such as USB key or WLAN key can be connected here.

E-field connectors for standard and buffered E-field cable

These four terminals are used to connect the standard or the buffered E-field cables. The plugs on the E-field cable have 6 pins. The center pin 6 is the pin where the standard E-field cable has to be connected to. In a typical arrangement the ADU is located in the center of the two E-field lines. Plug-in the cable connector in a way that the red dots match on plug and socket and push the plug in until it clicks.

Socket 6-pole ODU MiniSnap G32KON-T06QP00-000 Pin

Signal

1

+12V

2

-12V

3

Sensor GND

4

Sensor GND

5

n.c.

6

Input (+ or -)
../../_images/Pinning_of_E-Field_Plug-rear_view_%28to_solder_cups%29.jpg

Pinning of E-Field socket (front view)

GND Socket

This socket is used to connect the grounding rod or electrode with the ADU. The grounding can be done by a steel rod or an electrode. Grounding should be done closely to the ADU.

Caution

Grounding of the ADU is very important as otherwise the inputs can float and may be saturated.

Connector for Magnetic Field Sensors

On the right side of the ADU-08e you will find 3 sockets (10-pole ODU K-series) to connect the magnetic field sensor cables. Plug-in the cable connector in a way that the red dots match on plug and socket and push the plug in until it clicks.

Socket 10-pole ODU MiniSnap G32KON-T10QJ00-000 Pin

Signal

1

+12V

2

-12V

3

H-Chop

4

Sensor GND

5

Cal Signal+

6

Cal Signal -

7

Input +

8

Input -

9

\(I^{2}C\) SDA

10

\(I^{2}C\) SCL
../../_images/pinning_h_field_socket_front_view.jpg

Pinning of H-Field socket (front view)

Installation in the Field

This chapter describes the setup of the ADU-08e and ADU-08e-2C and of the sensors in the field.

Definition of Polarities

The following polarities are defined in the ADU-08e-2C:

E-Fields

EX:

NORTH = Plus

South = Minus

EY:

East = Plus

West = Minus

When applying a DC voltage to the input terminals of the ADU-08e / ADU-08e-2C as described above, the result will be a positive output on the A/D converter. The time series will show a positive value.

Standard Setup

Necessary Components

Only a few components are required:

ADU-08e (9094-0004-05) and /or ADU-08e-2C DataLogger (Metronix Art.No. 9094-0005-02)

 ../../_images/adu-08e.jpg

4 electric field probes (EFP-06) (Metronix Art.No. 8094-0012)

 ../../_images/EFP06.png

4 electric field cables (Metronix Art.No. 8094-0040-00)

 ../../_images/e_field_cable.png

3 magnetic field cables (Metronix Art.No. 8094-0038-20) (5 channel setup)

 ../../_images/coil_connector_small.jpg

3 magnetic sensors MFS or fluxgate / SHFT (5 channel setup)

 ../../_images/mfs06e_dugin.jpg

1 grounding rod + cable or grounding electrode

 ../../_images/steel_rod.png ../../_images/EFP06.png

Control computer, mobile phone or tablet computer for system control

 ../../_images/mobile_phone.png ../../_images/control_computer.png

Placement of Sensors in the Field

../../_images/typical_setup.png

Typical field setup 2 channels

../../_images/typical_5_channel_mt_field_setup.jpg

Typical field setup 5 channels

It is recommended to align the field setup to the north. This means:

  • Ex is heading to the north/south direction (connectors N and S on ADU-08e / ADU-08e-2C).

  • Ey is heading to the east/west direction (connectors E and W of ADU-08e / ADU-08e-2C).

  • Ground electrode or steel rod should be placed close to the ADU-08e / ADU-08e-2C system.

  • Hx is pointing North (cable end South), 5 channel setup with ADU-08

  • Hy is pointing East (cable end West), 5 channel setup with ADU-08

  • Hz is pointing down (cable end up), 5 channel setup with ADU-08; Hz can be skipped in case (no tipper in this case)

Caution

Swapping the connectors (e.g. North/South for Ex) will invert the recorded time series and finally mess up the measurement results.

Note that this issue can be fixed afterwards by inverting the time series before data processing is done.

Caution

Mixing E-Field channel connectors (e.g. using North/West for Ex and South/East for Ey) will completely mix up the recorded time series.

Such time series cannot be repaired anymore!

Caution

Rotated Setups (sensors not orientated North-South, East-West) can lead to later problems when using third party interpretation software.

Set-up of Electrodes

In the standard MT field setup the orthogonal electric fields EX and EY are recorded. For the measurement of one electric field component two electrodes (such as EFP-06) are used. They are dug into the soil with a distance of approx. 80 to 100 m. In order to have an optimum common mode rejec­tion of disturbing radio transmitters, the ADU-08e / ADU-08e-2C should be located in the center of the electric field dipoles.

Note

A long(er) dipole gives you some noise-free amplification of the electric field signals.

If an L-shape setup cannot be avoided you should use 4 probes in any case. The electrodes close to the ADU may NOT be connected with the ground electrode because this would induce a higher noise into the electric field inputs.

The exact alignment of the probe’s location must be determined using a compass and a measuring tape. The distance of the N/S and E/W dipole has to be noted and must be entered in the setup menu later on. The probe location can be marked by pickets to find them faster in the field again.

Dig holes of 20 cm to 30 cm depth and plant the probe into the soil after having added some water. Make sure that the bottom of the probe has a good contact with the soil and cover the probes by soil com­pletely. It is important that the soil is pressed down finally in order to obtain a good con­tact. It also may help to improve the ground resistance by mixing a paste of water and soil and planting the probe into that paste.

In case the soil is very dry, the grounding resistance can be diminished using some Ben­tonite which is mixed with soil around the probes and by adding some water. The Bento­nite will keep the moisture for a longer period of time. If you need to do long term measurements in a dry area, the probes should be dug in deeper (>80cm).

The typical probe resistance ranges between a few hundred Ohms up to 10 kOhms. However, it might be much higher in very resistive areas such as deserts and arid areas etc. In this case the use of the optional buffered cables is required especially for higher frequency recordings. Please also make sure that the E-field cables are not positioned too close to the magnetometers (>1m).

Note

If the probes are not used, make sure that the sponge at the bottom of the protection case is wet by water and that its lid is closed. The cap can also be sealed by some adhesive tape if the probe is not used for a longer period of time. The free cable end should be left outside the protection case in order to avoid corrosion on its open end.

Note

The condition of the electrodes can be checked as follows: take a new, fresh electrode and one of the electrodes which are already in use. Put them on a wet cloth or a container filled with some water on its bottom and check the voltage offset between both electrodes. The voltage should be less than 30mV. If it is much higher the old electrode must be replaced.

../../_images/cable_comes_out_electrode_to_e-field_cable_reel.jpg

The cable that comes out of the electrode is connected to the E-Field cable reel.

../../_images/efp_connected.jpg

Finally, the E-Field connector of the cable reel is connected to the E-Field inputs of the ADU-08e / ADU-08e-2C data logger (N, S, E or W).

Note

After some time of usage the cable coming out of the EFP-06 electrode starts to corrode. Make sure to clean the end of the cable before connecting it to the cable roll to make good contact.

Note

Make sure the EFP-06 electrode has good connection to the ground. In very dry areas use Bentonite additionally in order to increase the conductivity between electrode and ground.

Caution

Bad contact between electrode and soil will cause increased noise in your E-Field data. This is most likely detected by big probe resistance values for the E-Field channels during the instrument´s self-test.

Caution

The EFP-06 are Lead/Lead-Chloride electrodes. Take care to wear proper protection gloves or wash hands after handling with it. Do not eat or drink during installation of the EFP-06 electrodes.

Note

Collect electrode waste separately:

The waste electrodes must be collected separately from other (for example municipal) waste and handed over to competent organization for treatment, recycling, etc.

Set-up of Grounding Electrode or Steel Rod

Place the grounding electrode (or steel rod) close to the ADU-08e / ADU-08e-2C system and connect it to the “Sensor Ground” input of the ADU-08e / ADU-08e-2C system.

Caution

Make sure that the sensor ground has good contact to the earth. Bad contacts for sensor ground may cause floating sensor signals and increased noise inside the time series data.

Set-up of Coils

By default the coils are connected by a 20m cable; the distance to the ADU-08e is necessary to avoid interference, especially when you work with the ADU and connect a cable or change the battery.

Caution

When you walk beside the coil the soil will vibrate and your measurement is destroyed.
Same applies when using the mobile phone.

../../_images/mfs06e_dugin.jpg

Dig a trench at least 30cm deep - oriented North and oriented East; drill a hole as deep as the coil length. The coils must be placed exactly horizontal an vertical (+/- 2 degrees is ok realistically).

Note

Use geographical orientation - not magnetic. Finally you want to plot your data on a map, which are all geographical North orientated.

The MFS coils are not temperature sensitive. The fluxgate is; here you get more stable data if you dig deeper.

Make sure that the cables are not moving in the wind.

Note

The setup spawns a 3D space and all components must be perpendicular.

Set-up of GPS Antenna

The GPS antenna is connected to the “GPS” input of the ADU-08e / ADU-08e-2C. The antenna itself must be placed somewhere with clear view to the sky and should be protected against strong movement by wind.

Note

If time synchronous data shall be recorded, e.g. for means of remote reference data processing it is most important to provide full GPS synchronisation at any time of the recording.

Note

Note that the ADU-08e / ADU-08e-2C res-syncs to GPS only, if the system is NOT recording data. Therefore make sure that the ADU-08e / ADU-08e-2C is fully synced to GPS before the measurement is started.

Boot Up ADU-08e / ADU-08e-2C

When all other components have been installed and connected to the ADU-08e / ADU-08e-2C, the last step is to connect it to a 12V battery. This may be any 12V battery with sufficient capacity (>10Ah). The delivered battery cable is connected to one of the two sockets labeled as „BAT“. Connect the black clamp with the –pole and the red clamp with the +pole of the battery.

Note

A connection with wrong polarity on each of the battery inputs which has been accidentally made will not cause any harm on the instrument.

It will then just simply not start working. After a correct battery connection it will boot up normally.

When the battery has been connected, the ADU-08e / ADU-08e-2C can be switched on by pressing the “Power” button on its front panel.

The ADU-08e / ADU-08e-2C will boot-up and execute the “Self-test” routine. The “Self-test” ends as soon as the “GPS” and “Battery” LEDs on the ADU-08e / ADU-08e-2C Front-panel stop blinking.

Connection of The Field Laptop Computer

The laptop is connected to the ADU-08e / ADU-08e-2C with a network cable or by a WiFi connection in case a supported WiFi stick is inserted and has been activated. A suitable WiFi stick is delivered along with the instrument. As a network cable you may use any standard Cat5e or better network cable with RJ45 plugs. One end of this cable is connected to the socket labeled „NET“, the other end is connected to the Ethernet socket of the laptop computer.

If the communication is ok and after having entered the proper network address which is written on the sticker inside the front cover into your browser you will be able to contact the ADU-08e / ADU-08e-2C. We recommend to book-mark the ADU´s address in your browser.

Note

Make sure that no Proxy Server is selected in your browser settings! The network parameters of your laptop have to be set in a way that it can access the 192.168.60.xxx network address room for LAN access. The number xxx ranges from 0 to 255 and must be different from the last address number of the ADU.

Please refer to chapter 4.2.8.2 for the necessary setup.

Note

Note that the total length of the network cable between ADU and Laptop may not exceed 100m.

Note

Note that for means of power saving the ADU-08e / ADU-08e-2C will deactivate the WiFi after 15 minutes if no device has been connected. You can reactivate WiFi with help of the power button.

Note

Note that your Laptop needs to have a network interface that is configured to work inside the same network segment as the ADU-08e / ADU-08e-2C system.

As the LAN interface of the ADU-08e / ADU-08e-2C does not provide a DHCP server (it does not configure the network card of your laptop automatically, if being connected), this needs to be done manually.

If you connect via WiFi, the network interface of your Laptop is configured by the ADU-08e / ADU-08e-2C automatically.

A detailed description of how to communicate with the ADU is given in the chapters 5,6 and 7.

Manual Configuratioin of LAN Network Interface

The LAN network interface that shall connect to the ADU-08e / ADU-08e-2C must work within the same network address range as the ADU-08e / ADU-08e-2C does. As the ADU-08e / ADU-08e-2C default LAN IP address is within the 192.168.60.XXX range, your Laptop network interface must be configured to an address in the 192.168.60.XXX range, too.

Example for Windows 10:

  1. Open the Network Manager and click on “Network Settings”

 ../../_images/configure_network_1.png

  1. Click on “Ethernet” and afterwards on “Change Adapter Settings”

 ../../_images/configure_network_2.png

  1. Select the network card that shall connect to the ADU-08e / ADU-08e-2C, right click on the entry and select “Properties”

 ../../_images/configure_network_3.png

  1. Select TCP/IPv4 and click on “Properties”

 ../../_images/configure_network_4.png

  1. Select “Manually configure IP address” and configure the IP address to one like 192.168.60.XXX with XXX being different from the one of the ADU-08e / ADU-08e-2C. The ADU number is given on a sticker inside the front panel cover.

 ../../_images/configure_network_5.png

See also connecting to the ADU in troubleshooting

Check the connection, using the “ping” Tool:

../../_images/configure_network_windows10_5.png

If successful, the number of lost packets is 0 (0%). If the connection cannot be created the number of lost packets is 4 (100%)

Pre-Measurement Checks

Once the ADU-08e / ADU-08e-2C has booted up and the self-test has finished (indicated by GPS and Battery LEDs stop blinking), the following checks need to be performed:

  • Check on front panel that GPS and STATUS LED are green.

  • Check that the Battery LED is also green or at least yellow.

Check Self-test Results

The self-test results need to be checked, too. In most cases they will be OK. In case of warnings or critical errors the self-test results MUST be checked before the start of the measurement. This can be done in the following ways:

Mobile App “ADUCLIENT”:

1.) Check “STR” Button on Main Menu If the buttons
colour is green all is OK and the check ends here. If the
colour is yellow or red, click on the “STR” Button and continue with 2.).

 ../../_images/check_str_button.jpg

2.) Check the entries “Severity” and “Message” to find detailed
information about the self-test results error.

 ../../_images/check_entries_severity_message.jpg

Web-interface:

1.) Check status on “Self-test Results” page If it is OK, the checked
ends here. If it is Warning or Critical, continue with 2.)

 ../../_images/check_selftest_result.jpg

2.) Check the detailed descriptions of the Self-test Results error for each board.

 ../../_images/check_detailed_description_self_test_result.jpg

Note

If the Self-test Result is “Warning” the detailed self-test results should be checked. In most cases the measurement can be started.

Caution

If the Self-test Result is “Critical” the reason for the errors MUST be checked and the reason of the problem needs to be fixed before starting any measurements. Otherwise, the system behaviour may be undefined and lead to unusable measurement results.

Start Measurement

If all checks are OK, the measurement can be started, either via the Mobile App ADUCLIENT (see chapter 6), the Web-interface (see chapter 7) or by a pre-configured USB Mass Storage Device (see Job-listEditor” manual).

During the self-test the required gain- and filter-settings are determined. You should follow these recommendations and use the settings for the recording job. The App ADUCLIENT will always use the determined gain and filter settings. When using the web-interface or the job-list editor you must activate this option (Use Auto-gain/Auto-offset) as described in the corresponding chapters 7.3.1.1 or 7.3.2.7.

Front Panel Display

You can interact with the ADU-08e using the display and the buttons located on the front panel. The display provides 64 characters per line. For navigation you have these keys:

../../_images/f1_key_symbol.png

Function keys F1, F2, F3, F4

The meaning of the keys changes with the context. It is displayed in the last line of the display.
../../_images/left_arrow_key_symbol.png

Curser keys

The curser keys left, right, up, down allow to navigate within the display.
../../_images/home_key_symbol.png

Home key

Navigates to the Home screen.
../../_images/back_key_symbol.png

Back key

Skips one menu level back.
../../_images/ok_key_symbol.png

Enter key

Confirms/Selects a menu entry or user input.
../../_images/power_button_symbol.png

Power Button

The Power Button is used to switch on the Front-panel Display,
in case the ADU-08e system is powered on. Long press to the
button will open the “Shutdown / Reboot” menu to power off or reboot the system.

Home Screen

You have 8 menu items which can be selected by the curser keys. With the ENTER key you jump into the next menu level. The maximum menu depth is three.

../../_images/front_panel_menu_1.png

Status Menu

../../_images/front_panel_menu_2.png

REC

Shows the current recording status which can either be:

Idle: no recording active of scheduled

Waiting: A job is scheduled in the future and ADU-08e waits for its start-time

Recording: A job is currently active and the ADU-08e is recording data

GPS

Shows the current GPS status (No fix, G1 fix, G2 fix, G3fix, G4fix). The system is only fully synchronized with G4fix status.

BAT

Shows the current battery status (Supply Voltage and Current drawn from the battery inputs).

TMP

Shows the current internal system temperature in °C

DISK

Shows the amount of free disk space on the data SD card

There ar four soft keys that execute the following functions:

JOBS

Enters the “Job Control” submenu that shows detailed information the current job status as well as the ability to stop all / the currently active job.

GPS

Enters the “GPS” module showing the detailed GPS status as well as providing the ability to reset the GPS (force re-synchronization).

SELFT

Enters the “Self-test” submenu that gives detailed information about the Self-test results of the system (including all ADB boards).

GAINS

Enters the “Gains” submenu showing details about the determined AutoGain values.

Self-test

The “Self-test” menu shows detailed information about the Self-test results.

../../_images/front_panel_menu_3.png

On top of the menu the status of the complete system is shown as follows:

Overall

Status of the complete system (sum of system boards and ADB boards)

System

Status of system boards, like Main Backplane, Connector Board and GPS Board.

ADB

Status summary of the ADB boards.

Each one of the Status may be either

OK

All is OK – no problem with the component

Warning

There is an issue with the board or component – check detailed problem description

Critical

There is an major problem with the component – detailed problem description MUST be checked and the problem must be solved before continuing the survey.

The softkey BOARD displays detailed results of the self-test for each board showing the status of the ADB boards Self-test result (OK, Warning, Critical), the error number index and finally the detailed error description.

../../_images/front_panel_menu_4.png

USB

This screen allows you to do operations with the USB devices connected to the ADU.

../../_images/front_panel_menu_5.png

There are 3 soft keys that execute the following actions:

EJECT

Eject a connected USB mass storage device from the system, making sure that all data is synced (safe remove).

CP-TS

Copy all the time series data from data SD card to the connected external USB mass storage device.

CP-DB

Enters the “Self-test” submenu that gives detailed information about the Self-test results of the system (including all ADB boards).

E-Field

The “E-Field” menu shows detailed information about “Probe Resistance” (contact resistance of the E-Field probes to the ground) and the DC-Offset that was measured on the sensor inputs during Self-test.

../../_images/front_panel_menu_6.png

There are 3 soft keys that execute the following actions:

DET

This will restart the Selfetst Steps that detect the sensors DC offset and probe resistance along with determining best fitting AutoGain values.

SPCNG

This button will lead into the “Sensor Spacing” submenu that is used to configure the E-Field spacing (see following chapter).

E-Field Spacing

The E-Field Spacing submenu shows the currently configured spacing for the electric fields.

../../_images/front_panel_menu_7.png

Pressing the “EDIT” button will switch to the edit mode where the spacing can be changed. All changes will become active in Webinterface and Mobile App, too.

GPS

The “GPS” submenu shows detailed information of the GPS, like position, synchronization status to GPS time and current date / time.

../../_images/front_panel_menu_8.png

There are 2 soft keys that execute the following actions:

RSTSW

This will do a warm-start of the GPS module, just re-synchronising to GPS

RSTHW

This will do a cold-start of the GPS module, resetting all known Sattelite and Almanach information

Note

In both cases any running measurements are stopped before the GPS reset is done!

WIFI/NET

This submenu gives detailed information about the network connection of the system. It shows IP addresses currently used for LAN and WiFi.

../../_images/front_panel_menu_9.png

There are 2 soft keys that execute the following actions:

EDIT

This will enter the “Edit” mode to change the IP address settings for LAN and WiFi. Once the updated network settings are saved, they will immediately become active.

WIFI

This will switch on/off the WiFi. Note that this will only work if an USB WiFi device is connected to the ADU-08e system.

System

This submenu shows the last 10 messages of the ADU-08e System History (log of all executed actions).

../../_images/front_panel_menu_10.png

There are 4 soft keys that execute the following actions:

IP

This will enter the “WiFi/NET” menu.

←

This will scroll to the next System History message.

→

This will scroll to the prior System History message.

CP-DB

This will dump the current contents of the ADU-08e system database to disk. It can afterwards be downloaded from “<IP Address of ADU>logDBDump”. The dumped database can be send to Metronix for detailed help in case of system problems.

Reading data from ADU-08e

The ADU-08e provides a network file system to easily read recorded measurement data from the system. For this purpose the laptop or mobile device must be connected to the ADU-08e system as described in chapter 4.2.8.1.

Additionally, the measurement data can directly be read from the ADU-08e data SD card that is accessible from the front panel.

Caution

Make sure that the ADU-08e system is powered down before you remove / exchange the data SD card.

Caution

Do not forget to insert an SD card before the ADU is started and a recording shall be made. Otherwise disk space will be very limited as the recorded data would be stored on the internal µSD card.

Reading data from Windows systems

If using a Windows™ operating system follow the following steps to connect to the ADU-08e data directory:

1.) Open “Explorer”, right click on “This Computer” and afterwards click on “Map Network Drive”

 ../../_images/reading_data_1.jpg

2.) Enter the target IP address and network drive name, e.g. \ \192.168.40.1\data And click on “Finish”

 ../../_images/reading_data_2.png

3.) Enter Username and Password Username: aduuser Password: neptun

 ../../_images/reading_data_3.png

Now the ADU-08e data directory is directly accessible like a standard Windows network drive in your Explorer.

../../_images/reading_data_4.png

Hint

Make sure you disconnect the network drive if you disconnect from the ADU-08e system as otherwise the Windows Explorer may show very long time lags as it tries to connect to the non-existing network drive.

Hint

The time series data can be read at any time, even during an active recording.

Caution

Do not move / delete / rename directories or files that are part of the currently active measurement as this will stop the measurement as the ADU-08e is not able to write any data to those files anymore.

Reading data from Linux systems

The easiest way to read data from ADU-08e systems using a Linux Operating System is to mount the ADU-08e data network drive, using the “mount” command:

mount –o username=aduuser,password=neptun //<IP address>/data /<target dir>

As an alternative you may use the standard Linux Explorer (like Dolphin or Konqueror) and directly enter the Samba share name:

smb://aduuser@<IP address>/data

Transfer Functions

Transfer Function of HF-Channel

The theoretical transfer function for the HF-channel is given below:

\(\\F_{HF - Channel} = G_{1} \cdot F_{1} \cdot F_{2} \cdot F_{3} \cdot F_{4}\)

with

\(\\G_{1} = 1\) or 4, 8, 16 depending on gain setting of first stage

\(\\F_{1} = \frac{1}{1 + P_{1}}\) ; \(\\P_{1} = i \cdot \frac{f}{338 kHz}\)

\(\\F_{2} = \frac{1}{1 + P_{2}}\) ; \(\\P_{2} = i \cdot \frac{f \cdot G_{1} }{100 MHz}\)

\(\\F_{3} = \frac{1}{1 + P_{3}}\) ; \(\\P_{3} = i \cdot \frac{f}{1.59 MHz}\)

\(\\F_{4} = \frac{P_{4}}{1 + P_{4}}\) ; \(\\P_{4} = i\frac{f}{482 Hz}\) if high-pass is switched on.

\(\\F_{4} = 1\) if high-pass is switched off.

(gains and input divider are calibrated in the LSB, you don’t see them)

Comparison Measured Data and Theoretical Function HF

../../_images/TRF_ADU-08e_ADB08e-HF_DIV-1_LF-RF-2_Gain1_1-4-8-16_amplitude_theo_measured.png ../../_images/TRF_ADU-08e_ADB08e-HF_DIV-1_LF-RF-2_Gain1_1-4-8-16_phase_theo_measured.png

Spectra for non MT usage should be corrected above 20 kHz.

Comparison Measured Data and Theoretical Function HF with 500 Hz high pass on

../../_images/TRF_ADU-08e_ADB08e-HF_DIV-1_Gain1-1_DAC-off_Gain2-1_LF-RF-off_LF-LP-off_HF-HP-500Hz_SensorResistance-250_measured_amplitude.png ../../_images/TRF_ADU-08e_ADB08e-HF_DIV-1_Gain1-1_DAC-off_Gain2-1_LF-RF-off_LF-LP-off_HF-HP-500Hz_SensorResistance-250_measured_phase.png ../../_images/TRF_ADU-08e_ADB08e-HF_DIV-1_Gain1-1_HF-HP-500Hz_vs_HF-HP-off_amplitude.png ../../_images/TRF_ADU-08e_ADB08e-HF_DIV-1_Gain1-1_HF-HP-500Hz_vs_HF-HP-off_phase.png

The small artefact in the measured phase is related to the fact that the signal is suppressed by the filter

Spectra for non MT usage should be always corrected

Transfer Function of LF-channel

The formula for the transfer function of an LF-channel is as follows:

\(\\F_{LF - Channel} = G_{1} \cdot G_{2} (\cdot G_{3}) \cdot F_{1} \cdot F_{2} \cdot F_{3} \cdot F_{4}\)

prefer to set \(\\G_{1}\) (gain stage 1) ONLY; 4 == excellent, 8 == perfect, 16 not needed, 1 … maybe low

Gains and input divider do not appear in the ats file, they are calibrated into the LSB

\(\\F_{1} = \frac{1}{1 + P_{1}}\) ; \(\\P_{1} = i\frac{f}{318 kHz}\)

\(\\F_{2} = \frac{1}{1 + P_{2}}\) ; \(\\P_{2} = i\frac{f }{2 MHz}\)

\(\\F_{3} = \frac{1}{1 + 1.414 \cdot P_{3} + P_{3}^{2}}\) ; \(\\P_{3} = i \cdot \frac{f}{4Hz}\) if 4 Hz Low-pass is switched on

\(\\F_{3} = 1\) if 4 Hz low-pass filter is switched off.

and

\(\\F_{4} = \frac{1}{1 + P_{4}}\) ; \(\\P_{4} = i \cdot \frac{f}{10.5 kHz}\) if RF-2 on & DIV-8 = on (default for coil, not used for E)

\(\\F_{4} = \frac{1}{1 + P_{4}}\) ; \(\\P_{4} = i \cdot \frac{f}{30 kHz}\) if RF-1 on & DIV-8 = on (not used for E)

\(\\F_{4} = \frac{1}{1 + P_{4}}\) ; \(\\P_{4} = i \cdot \frac{f}{\frac{0.159}{(R_{sensor} + 200) \cdot 7.27E^{-9}Hz}}\) if RF-2 on & DIV-1 = on (default for electrodes < 1500 Ohm contact resistance, default for buffer electrodes, not used for H) )

\(\\F_{4} = \frac{1}{1 + P_{4}}\) ; \(\\P_{4} = i \cdot \frac{f}{\frac{0.159}{(R_{sensor} + 200) \cdot 470E^{-12}Hz}}\) if RF-1 on & DIV-1 = on ( electrodes > 1500 Ohm contact resistance, not used for H)

Comparison Measured Data and Theoretical Function LF

../../_images/TRF_ADU-08e_ADB08e-LF_DIV-1_LF-RF-2_Gain1_1-8-16_amplitude_theo_measured.png ../../_images/TRF_ADU-08e_ADB08e-LF_DIV-1_LF-RF-2_Gain1_1-8-16_phase_theo_measured.png

Summary

For MT corrections are useless because channels are divided.

Additionally you may use f_sample / 4 as highest interpretation frequency; with the LF Board your are also already in the linear range.

For the HF board @65 kHz you have f_sample / 4 as highest interpretation frequency 16 kHz where the influence is still tiny.

For f_sample 130, 260 and 524 kHz corrections may apply for non MT applications

Declaration of EU Conformity

The ADU-08e complies with all EU standards relevant for this product (see below).

Terms and Abbreviations

Term

Meaning

AC

Alternating Current

ADB

Analog/Digital Board

ADU

Analog/Digital Unit (data logger)

ADU-08e

Data logger with max 6 channels E/H and sampling rates from 524 kHz downwards

ADU-08e 2ch

Data logger with max 2 channels E and sampling rates from 524 kHz downwards

ADU-10e

Data logger with 5 channels E/H and sampling rates from 256 Hz downwards

AMT

Audio Megnetotellurics

ATS

Advanced Time Series format (the data format in which the ADU stores the data – it consists of a data header and a binary data section)

ATSS

ATS Stream Data; palin 32bit int or 64 bit double stream

.JSON

corresponding header of the ATSS binary stream

CSAMT

Control Source Audio Magnetotellurics

DB

Data Base

DC

Direct Current

DHCP

Dynamic Host Configuration Protocol

EFP

Electric Field Probe

FGS

Fluxgate Sensor

FW

Firmware

GNSS

Global Navigation Satellite System

GPS

Global Positioning System

HF

High Frequency

HW

Hardware

Job

A recording job in which the start time, the stop time, the used sampling rates and the used filters are defined.

LAN

Local Area Network

LED

Light Emitting Diode

LF

Low Frequency

MCP

Master Control Program Controlsoftware on CPU Board, ADB Board, …

MFS

Magnetic Field Sensor

MT

Magnetotellurics

RMT

Radio Magnetotellurics

SD

Secore Digital Card – a storage media

SW

Software

TS

Time Series (the recorded data)

USB

Universal Serial Bus

UTC

Universal Time Coordinated

W-LAN

Wireless Local Area Network

XML

Extensible Markup Language

Trademarks

AndroidTM is a trademark of “Google Inc”

WindowsTM is a trademark of “Microsoft Corporation”

LinuxTM is a trademark of “The Linux Foundation”

Safety Notes

The ADU is a data logger for geophysical applications. It digitizes and records data from electric and magnetic field sensors. It may only be used for this purpose. Any usage apart from this application is not covered by this manual and must be avoided.

Used Symbols

Note

Important information and notes.

Caution

Non-observance may result in severe property damages.

Danger

Non-observance may result in property damages and in personal injuries.

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Electric Shock! Risk of electric shock.
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Grounding Symbol: System needs to be grounded.

Danger Resulting From Misuse

Danger

If the ADU is used during thunderstorms it can happen that a direct lightning strike hits a connection cable especially an electric field cable. This can destroy the system.

If the ADU is operated during such conditions personal injury and even death of the operating person can occur. Operation during thunderstorms is not allowed.

Caution

The ADU corresponds to IP 6 degree of protection as well as pollution degree 5. Make sure that the environment corresponds to this degree of protection and pollution degree (IP65).

Caution

Only use replacement parts and accessories approved by the manufacturer.

Note

The safety rules and regulations of the country in which the device will be operated must be complied with.

Caution

The environment conditions defined in the product documentation must be kept. Safety-critical applications are not allowed, unless specifically approved by the manufacturer.

Note

For notes on installation corresponding to EMC, please refer to chapter 9. The compliance with the limits required by national regulations is the responsibility of the manufacturer of the machine or system.

Caution

The technical data and the connection and installation conditions for the ADU are to be found in this product manual and must be met.

Danger

The general setup and safety regulations for work on power installations (for example DIN, VDE, EN, IEC or other national and international regulations) must be complied with.

Non-compliance may result in death, personal injury or serious property damages.

Note

Without claiming completeness, the following regulations and others apply:

VDE 0100

Erection of power installations with nominal voltages up to 1000 V

EN 60204-1

Safety of machinery - Electrical equipment of machines Part 1: General requirements

EN55011:2009 + A1:2010

Industrial, scientific and medical (ISM) radio-frequency equipment – Electromagnetic disturbance characteristics – Limits and methods of measurement.

EN61000-4-6-2014

Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-6:2013); German version EN 61000-4-6:2014

EN61000-4-8-2010

Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement techniques - Power frequency magnetic field immunity test (IEC 61000-4-8:2009); German version EN 61000-4-8:2010

EN ISO 12100

Safety of machinery - General principles for design - Risk assessment and risk reduction

Safety Notes for Assembly and Maintenance

The appropriate DIN, VDE, EN and IEC regulations as well as all national and local safety regulations and rules for the prevention of accidents apply for the assembly and maintenance of the system. The plant engineer or the operator is responsible for compliance with these regulations:

Caution

The ADU must only be operated, maintained and/or repaired by personnel trained and qualified for working on or with the system.

Caution

Prevention of accidents, injuries and/or damages:

  • Take care of heavy components, like MFS-06e/07e sensors. Getting hit by these components may cause serious injuries.

  • Keep the electrical equipment voltage-free disconnecting the battery and protect it from being switched on, in the case of:

    • Maintenance and repair work

    • Cleaning

    • long machine shutdowns

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    Prior to carrying out maintenance work make sure that
    the power supply has been turned off and locked, batteries have been disconnected.
    ../../_images/IEC60417-5036.svg

    The external supply battery may push very big currents, if being shorted.

  • Be careful during the assembly. During the assembly and also later during operation of the ADU, make sure to prevent from being flooded by water (e.g. during very heavy rain fall). Additionally take care that the maximum ambient temperature of 50°C is not exceeded, e.g. by protecting the ADU against direct impact from the sun.

  • Electronic devices are never fail-safe. It is the user’s responsibility, in the case an electrical device fails, to make sure the system is transferred into a secure state.

Protection against Contact With Electrical Parts

The appropriate DIN, VDE, EN and IEC regulations as well as all national and local safety regulations and rules for the prevention of accidents apply for the assembly and maintenance of the system. The survey manager is responsible for compliance with these regulations:

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DANGER! Risk of electric shock! The external supply battery may push very big currents, if being shorted.

Protection against Electrical Shock By Means Of Protective Extra-low Voltage (PELV)

All connections and terminals of the ADU are at a level of +/- 12VDC and therefore are protective extra-low voltage.

It is designed safe from contact in correspondence with the following standards:

  • International: IEC 60364-4-41

  • European countries within the EU: EN 61800-5-1

Danger

High electrical voltages due to wrong connections must be avoided!

Danger to life, risk of injury due to electrical shock!

Only devices, electrical components and wires with a protective extra low voltage (PELV) may be connected to connectors and terminals with voltages between 0 to 50 Volts.

Protection against Dangerous Movements

Not applicable as the ADU does not contains any moving parts.

Protection against Contact with Hot/cold Parts

Danger

In case the ADU is operated during very hot/cold weather the housing parts of the ADU may get very hot/cold. In this case the risk of injury is given, if the system is touched.

Protection during Handling and Assembly

Handling and assembly of certain parts and components in an unsuitable manner may under adverse conditions cause injuries.

Danger

Risk of injury due to improper handling!

Personal injury due to pinching, shearing, cutting, crushing!

The following general safety notes apply:

Note

  • Comply with the general setup and safety regulations on handling and assembly.

  • Use suitable assembly and transportation devices.

  • Prevent incarcerations and contusions by means of suitable protective measures.

  • Use suitable tools only. If specified, use special tools.

  • Use lifting devices and tools appropriately.

  • If necessary, use suitable protective equipment (for example goggles, protective footwear, protective gloves).

  • Do not stand underneath hanging loads.

  • Remove leaking liquids on the floor immediately to prevent slipping.

General Notes

In case of damage resulting from non-compliance with the safety notes in this manual, metronix Messgeraete und Elektronik GmbH will not assume any liability.

Note

Prior to the initial use you must read chapter 1.

If the documentation in the language at hand is not understood accurately, please contact and inform your supplier. Sound and safe operation of the instrument requires proper and professional transportation, storage, mechanical installation, and project planning – with a consideration of the risks as well as the protective and emergency measures – plus the proper and professional electrical installation, operation, and maintenance of the devices. Only trained and qualified personnel is authorized to handle electrical devices and systems:

TRAINED AND QUALIFIED PERSONNEL

in the sense of this product manual or the safety notes on the product itself are persons who are sufficiently familiar with the project, the setup, assembly, commissioning and operation of the product as well as all warnings and precautions as per the instructions in this manual and who are sufficiently qualified in their field of expertise:

  • Education and instruction concerning the standards and accident prevention regulations for the application, or authorisation to switch devices/systems on and off and to ground them as per the standards of safety engineering and to efficiently label them as per the job demands.

  • Education and instruction as per the standards of safety engineering regarding the maintenance and use of adequate safety equipment.

  • First aid training.

The following notes must be read prior to the initial operation of the system to prevent personal injuries and/or property damages:

Note

The following notes must be read prior to the initial operation of the system to prevent personal injuries and/or property damages:

  • These safety notes must be complied with at all times.

  • Do not try to install or commission the ADU before carefully reading all safety notes contained in this document. These safety instructions and all other user notes must be read prior to any work with the ADU.

  • In case you do not have any user notes for the ADU, please contact your sales representative. Immediately demand these documents to be sent to the person responsible for the safe operation of the ADU.

  • If you sell, rent and/or otherwise make this device available to others, these safety notes must also be included.

  • The user must not open the ADU for safety and warranty reasons.

  • Professional site layout and survey planning is a perquisite for sound operation of the ADU!

Danger

Inappropriate handling of the ADU and non-compliance with the warnings as well as inappropriate intervention in the safety features may result in property damage, personal injuries and electric shock.