24/32-Bit Geophysical EM Measurement System





As in seismics, technological advances in electromagnetic recording systems have emphasised the require­ment for simultaneous multi-channel data acquisition.

The Multi-Method Network Geophysical Measurement System ADU‑08e is the result of over 40 years of metronix´s experience in the design and manufacture of electromagnetic geophysical instruments. The electric and/or magnetic field sensors are connected directly to the ADU‑08e (Analog/Digital Signal Conditioning Unit), which is the core unit of this system. Multiple ADU‑08e units can be connected to a network using simple, light-weight and inexpensive network cable or WiFi.

The ADU‑08e electronics are housed in a small waterproof box only 7kg in weight. It comprises the complete circuitry for analog signal conditioning, 24/32 Bit A/D conversion and data storage. A very precise GPS-controlled time base guarantees synchronous recordings even under difficult GPS reception conditions.
The ADU‑08e can be tailored according to the user´s requirements.
The ADU contains 6 slots which can be equipped with different types of A/D converter boards. The A/D converter type broadband is optimized for lower frequency recordings in a range from DC up to 1024 Hz with 32 bit precision whilst the signal range from 1 Hz up to 250 kHz is measured with 24 bit precision. The 6th slot can contain an autonomous 5 channel module: a fluxgate sensor can be connected for low-frequency sounding and induction coils cover the higher frequency range simultaneously.





  • High data quality due to 24/32 Bit Analog/Digital conversion technology
  • 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, WiFi)
  • Compatible with all metronix sensors
  • Automatic unattended recording mode
  • Automated system self check of ADU‑08e and sensors during set up
  • Automatic input offset compensation eliminates self potential of electrodes
  • Realtime display of time series and spectra
  • Automatic determination of best setup of gains and filters on site
  • 12 V battery powered. Only a single battery is required for each ADU incl. sensors
  • Compact, light-weight, ruggedized and water-proof instrument design
  • Wide operating temperature range from -30° C to +50° C


The ADU‑08e has a built-in web server. All necessary setups to run a measurement are controlled by the web interface and can be accessed by any web browser; no software needs to be installed on your laptop or tablet.
Additionally the system can be controlled by easy to use Android / iOS mobile app.
The software ProcMT (free) performs standard and remote reference processing of the time series data using robust algorithms. Online processing inside the ADU‑08e with unattended data publishing on the ADU's web server is available.
Using an external GPS controlled transmitter the ADU‑08e provides CSAMT / CSEM recordings with real-time stacking.



Adu-08e Technical Data

Sample rates 256 Hz to 262 kHz; lower sample rates are created by digital filtering
Number of channels 1 to 5 (one additional slot (#6) is provided and can be used for additional max. 5 channels )
Display 64 char x 5 lines alpha numeric
A/D conversion Low-Frequency section 32 Bit (up to 4,096 samples/sec) , High-Frequency section 24 Bit (up to 262 ksamples/sec)
Dynamic range > 130 dB
System controller 32 bit embedded controller with 4 CPU cores, Linux operating system
Storage media SD card up to 128 GB (pluggable)
Test facilities Automatic power up self test of all important system functions including sensors and display of result on the instrument.
Calibration Automatic calibration (incl. Sensors)
Gain settings and offset compensation Automatically by software
E-field connector input resistance > 10 Mohm, ODU G32KON-T06QP00-000 (ADU E socket) ODU S22KON-T06MPL0-4000 (E-Field cable plug)
H-field connector input resistance 20 kOhm, socket ODU G32KON-T10QJ00-000 (ADU socket) ODU S22KON-T10MJG0-7000 (H-Field cable plug)
Network connection GigaBit Twisted Pair Ethernet, wireless access point by optional WLAN USB device
Satellite receiver 72 channels (GPS, GLONASS, BeiDou, Galileo)
Synchronization GNSS / GPS synchronized clock +/- 30ns rms to satellite reference. Station position is also determined and stored
Interfaces Network, 3 magnetometers, 2 E-field lines, 2 battery inputs, external GPS antenna, 2 x USB
Case ruggedized, waterproof Polycarbonate case
Weight Approx. 7 kg
External dimensions 400 x 330 x 170 mm
Power consumption (with 5 channels) Approx. 5W @ max. sample rate 4096Hz (LF mode), approx. 12W @ higher sampling rates (HF-mode)
Operating temperature range -30°C to + 55°C ambient temperature