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ADU-10e

The new ADU-10e (lid removed):

Introduction

Performance Characteristics

The ADU-10e (Analog Digital Unit) is a LF logger with 512 Hz sampling rate for remote reference stations as well as for long term fluxgate recording.

The ADU-10e has 5 channels built in and records either with 512, 256 or 16, 8 Hz using a digital filter.

Multiple ADU-10e 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-10e electronics is housed in a small (41cm x 32cm x 17cm) waterproof box only 6 kg in weight. (from 2024 on the casing will changed to the ADU-11e) In spite of the small size, it contains the complete circuitry for analog signal conditioning of 5 channels, 32 Bit A/D conversion and data storage as well as a very precise GPS controlled time base (using GPS, Galileo and GLONASS).

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

Either the single ADU-10e 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 / or “aduclient” app (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-10e. It is also possible to connect magnetometers from other companies on option.

The ADU-10e 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 32 Bit (LF) Analog/Digital conversion technology
Very low system self-noise
Sampling rates 8, 16 Hz and 256, 512 Hz
System can be operated as a stand-alone or as a multi-channel network system when connecting multiple ADU-10e in a Local Area Network (LAN). An integrated W-LAN module is now standard.
ADU-10e is controlled by any Web-browser without need of further software
ADU-10e is controlled by mobile phone or tablet (“aduclient” app)
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, FGS-03e/FGS-04e and future sensors)
Automated system self-check of ADU-10e and sensors during set up.
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-10e 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 128 Hz
Number of channels	5
Native sample rates of A/D converter	512, 256 Hz; 16, 8 Hz with integrated filter
	(lower sampling rates by off-line digital filtering)
A/D conversion	LF: 32 Bit (data rate max. 512, 256 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
Input resistance	>10 MΩ
Nominal input voltage range (@ gain 1)	switchable between +/- 2.5V and +/-10V
	(is done automatically by selection of sensor type)
System computer	32 bit low-power embedded controller with Linux operating system
Storage media	32 GByte SD card, max 512 GB (4 TB on external USB disk with ext4), USB-pen-drive or other external USB mass storage device
Test facilities	Automatic on 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	100 Mbit 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 100 Mbit ruggedized socket(s)
	3 x Magnetometer 10-pole
	4 x E-field input terminal 6-pole
	1 x Multi-Purpose for fluxgate 12 pole G32K0C-P12QF00-0000
	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
Case	ruggedized, water-resistant case
Weight	appr. 6.0 kg
External dimensions	406330174 mm3
Power Input	9V … 15V DC
Power consumption	2.5W
	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

A MFS coil typically consumes 0.9 W

Tips & Tricks

With the 32 bit resolution the ADC is set to 1.185000E-06 mV for E and 4.740000E-06 mV for H. There is no further need to make gain settings (for ADU-10e and ADU-08e this is gain_2 in direct mode)

Fr fluxgate you may use 256 Hz sampling rate and 32x decimation. Else 512 Hz.

Declaration of EU Conformity

The ADU-10e complies with all EU standards relevant for this product

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

Android^TM is a trademark of “Google Inc”

Windows^TM is a trademark of “Microsoft Corporation”

Linux^TM 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.

	Electric Shock! Risk of electric shock.
	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

	Prior to carrying out maintenance work make sure that the power supply has been turned off and locked, batteries have been disconnected.
	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:

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 Meßgeräte 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 authorised 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.