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OMEGA 48 Resistivity meter

omega-48-72-96 channels ERT SYSTEM

GEOTECH ERP-1 1D Vertical Electrical Sounding and Profiling Equipment

RESISTIVITY SYSTEM OMEGA-48

OMEGA-48 is a multichannel Resistivity system designed for vertical electrical sounding (VES) and induced polarization (IP) methods on electrical resistivity tomography (ERT) technology.

  • Description
  • Characteristics

OMEGA-48 is a multichannel Resistivity system designed for vertical electrical sounding (VES) and induced polarization (IP) methods on electrical resistivity tomography (ERT) technology.

Resistivity system OMEGA-48 consists of

•Multi-electrode 10-channel Resistivity instrument which includes transmitter, receiver and switching unit connected to current and measuring lines in a single heavy duty cable with waterproof enclosure

•Two sections of multi-core cable with 24 electrode each

•Industrial laptop

•Software for system control, results acquisition, data processing and interpretation:

•developing field measuring protocol, SEQ files,

•managing measuring process, data collection and storage,

•visualization and editing field data,

•automatic data 2D inversion,

•visualization of inversion result.

Resistivity instrument measures amplitude parameters of output current of the transmitter, electrical potential difference between measuring electrodes (apparent resistivity), time parameters of chargeability (apparent chargeability) determined on voltage decay curve at measuring electrodes after switching off the current.

RESISTIVITY SYSTEM OMEGA-48

OMEGA-48 is a multichannel Resistivity system designed for vertical electrical sounding (VES) and induced polarization (IP) methods on electrical resistivity tomography (ERT) technology.

  • Description
  • Characteristics

Resistivity instrument measures amplitude parameters of output current of the transmitter, electrical potential difference between measuring electrodes (apparent resistivity), time parameters of chargeability (apparent chargeability) determined on voltage decay curve at measuring electrodes after switching off the current:

Specifications

 Number of measuring and current electrodes connected to the multi-core cable  48, the multi-core cable consist of two sections, 24 electrodes each, the unit is located in the center
 Number of channels for simultaneous measuring operation  1 to 10. A pair of receiving electrodes for each channel is selected according to protocol
 Number of current lines in simultaneous operation  1. Transmitting electrodes pair is selected according to protocol
 Electrode spacing  1 to 10 m
 Multi-core cable lenght  50 to 500 m (two sections with length from 25 to 250 m)
 Signal form  direct current bipolar impulses of regulated duration with pauses
 Power supply  24 V, external
 Operating temperature  -20 to +50°C (option down to -40°C)
 Transmitter 
 Number of input channels  1 (or 2 lines) (commutation multi-core cable is possible)
 Direct current bipolar impulses of regulated duration with pauses
 Impulses duration  0.2048, 0.4096, 0.8192, 1.6384, 3.2768, 6.5536, 13.1072, 26.2144, 52.4288 seconds
 Duty ratio  0.2 .. 0.5
 Output voltage  30, 100, 300, 500 V
 Instability of output voltage under variation of load resistance  1% at most
 Output current  10 mA to 5A
 Maximum output  capacity  0.5 kW (500 V – 1 A, 100 V – 2 A, 30 V – 5 A)
 Time for complete current cut-off on active load  10 μs at most
 Protection from short circuits on the output
 Receiver 
 Number of input channels  1 to 10 pairs of dipoles
 Input resistance of each channel  at least 20 MOhm
 Range of measured signals  10 μV to 12 V
 Amplitude response of each channel  at least 2 to 3 μV
 Instant dynamic range  at least 90 dB
 Voltage of in phase signal on the input  12.5 V at most
 Amplification rate of the prime amplifier  1, 10, 100, 1000
 Bit length of Sigma-delta analog-digital converter (ADC)  24
 Level of in phase interference suppression  at least 80 dB
 level of industrial interference suppression with frequencies 45 to 55 and 55 to 65 Hz  at least 80 db
 Operating temperature  from -20 to +50°C (option down to -40°C)

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3- Electromagnetic (EM) and Resistivity Transmitters Receivers 1- Electromagnetic EM and Electrical Resistivity Sounding VES
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