ADU-10e

The new ADU-10e

Introduction

The ADU-10e (Analog Digital Unit) is a LF logger with 1024 Hz sampling rate for remote reference stations as well as for long term fluxgate recording.

Performance Characteristics

The ADU-10e has 5 channels built in and records either with 1024, 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 Ethernet, or as part of an array, in which each unit is synchronized by its built-in GPS controlled precision clock. Access via WiFi is also built in.

The ADU-10e electronics is housed in a small (WxHxD 33 cm x 12cm x 25 cm) waterproof box. 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.

All metronix magnetometers like MFS-06e, MFS-07e, FGS-03e, FGS-04e, MFS-10e and SHFT-02e & SHFT-03e can be connected directly to the ADU-10e.

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, 1024, 2048 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 or laptop (responsive Web-GUI)
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

Tech. Data	Specs.
Frequency range	DC to 1024 Hz
Number of channels	5
Native sample rates of A/D converter	2048, 1024, 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)
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	128 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, 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. 4.8 kg
External dimensions	WxHxD 33 cm x 12cm x 25 cm
Power Input	9V … 15V DC
Power consumption	2.5W
	depending on operation mode
Operating temperature range	-30°C to + 60°C

You can use syncthing, rsync and WebDAV to transfer data to your office.

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)

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

For long term recording, you may want to add extra E-field protection. Click here for more information.