Home Products Rentals Services Case Histories Contact  
Airborne Surveying Systems
Borehole Logging Systems
Earthquake Detection & Vibration Monitoring
Electromagnetic Systems
Environmental, Engineering & Archaeology
Ground Penetrating Radar
Induced Polarization Systems
Magnetic Susceptibility Meters
Marine Systems
Physical Properties
Proton Magnetic Resonance
Radiation Detection
Resistivity Meters
Seismic Equipment
UXO Detection

Syscal R1 Plus, Switch 72


Switch Plus 3D Resistivity Imaging Option | Syscal R1 Plus Console

Syscal Junior resistivity meterResistivity Imaging For Environmental Applications
  • Compact yet powerful
  • 600 V - 200 W new - 2.5 A
  • Automatic ranging
  • Automatic switching

SYSCAL R1 PLUS Switch-72 is a new all-in-one multinode resistivity imaging system. It features an internal switching board for 72 electrodes and an internal 200 W power source. The output current is automatically adjusted (automatic ranging) to optimize the input voltage values and ensure the best measurement quality. The system is designed to automatically perform pre-defined sets of resistivity measurements with roll-along capability. Four strings of cable with 18 electrode take-out each are connected on the back of the resistivity meter. Made of heavy duty seismic cable, these strings are available with standard 5 or 10 m electrode spacing. Customized cables may also assembled for special arrays or non-standard applications.

Compact, easy-to-use and field proof, the SYSCAL R1 PLUS Switch-72 measures both resistivity and chargeability (IP). It is ideal for environmental and civil engineering applications such as pollution monitoring and mapping, salinity control, depth-to-rock determination and weathered bedrock mapping. It can also be used for shallow groundwater exploration (depth and thickness of aquifers).

With the SYSCAL R1 Plus Switch-48 resistivity surveys can be performed very efficiently with one operator only.

  • Aim: imaging the underground geological structures through surface electrical measurements

  • Principle: transmitting a current I through two electrodes and measuring a voltage V with two other electrodes

  • Apparent resistivity: p = K*V/I, K depending on the electrode separation

  • Resistivity pseudo-section: contoured plot of the apparent resistivity data, using the electrode distance as a pseudo-depth parameter

  • True resistivity section: contoured plot of the resistivity distribution obtained through the inversion of the measured data (using a non linear parameter fitting scheme)

  • Applications: environmental studies, groundwater investigation, civil engineering, archaeology


Preset arrays (Wenner, dipole,) or customized arrays are uploaded through the user-friendly ELECTRE (version 2) PC software. The roll-along capability is implemented.


  • Automatic SP compensation including linear drift

  • Digital stacking for noise reduction

  • Standard deviation computation

  • Noise may be monitored before injection


  • RES2DINV or RESIX-2DI (PC), for pseudo-section inversion to true resistivity (and IP) 2D section.

  • RES3DINV (PC), for inversion to true resistivity (and IP) 3D data


  • Automatic ranging (microprocessor controlled)

  • Intensity: up to 2500 mA

  • Voltage: up to 600V (1200V peak to peak)

  • Power: up to 200 W new

  • Selectable cycle time of 0.5 , 1 or 2 s, programmable from 0.25 to 10 s. 

  • Current measurement precision: 0,5% typical.


  • Measuring process: automatic ranging and calibration

  • Input impedance : 20 MW minimum.

  • Input voltage protection up to 1000V, range from 5 V to +5 V.

  • Power line rejection

  • Voltage measurement precision: 0.5% typical

  • Noise reduction: continuous stacking selectable from 1 to 255 stacks.

  • SP compensation through automatic linear drift correction.

  • Resistivity accuracy: 0,5% typical

  • Induced polarization (chargeability) measured over four predefined windows.

  • Chargeability accuracy: 1% of measured value for input voltage higher than 10 mV.


  • Weather proof

  • Shock resistant fiber-glass case

  • Operating temperature: -20 to +70 C

  • Dimensions: 31 x 23 x 35 cm. Weight: 11.5 kg

  • Internal memory for 2700 readings

  • Power supply: two internal rechargeable 12V, 7 Ah battery ; optional external 12V backup car battery for transmitter power

  • Autonomy with internal battery: several thousands of readings

  • 18 cable string weight: 11 kg each for 5m spacing