Syscal R1 Plus, Switch 72
Resistivity Imaging For Environmental Applications

Switch Plus 3D Resistivity Imaging Option
Syscal R1 Plus Console
  • 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.
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Resistivity Imaging
  • 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
Field Layout

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
Data Interpretation Software
  • 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
Output Current Specifications
  • 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.
General Specifications
  • 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
Ordering Information

Order Number
Syscal R1 Plus Switch 48 500-400-0185R1_48