Resistivity Meters

A selection of standard, four electrode, resistivity meters offering a range of transmitting power and capabilities:

G-Ohm Earth Resistance Tester for Utilities

A more powerful solution for utilities performing Fall Off Potential Measurements, and grounding studies. The G-Ohm system offers improved data quality due to automated stacking and digital filtering, with automatic correction of self potential.

• Automatic
• Data storage
• Field proof

• Earth resistance measurements
• Ground resistivity

• Measurement and display of Earth resistance and resistivity (Wenner)
• Internal memory up to 2000 readings
• Fully automatic measurement
• Attractive outputs:
  • 200V maximum output voltage
  • 25 W maximum output power
  • 500 mA maximum output current
• Automatic fixing of the output voltage in relation with the level of the measured signal
• Quality control of the measurement through standard deviation.
• Display of measured voltage, intensity of current, resistance and resistivity.
• Accuracy better than 1%
• Serial link for transfer to PC

• LCD display: 4 lines of 20 characters
• Keypad: 6 functions keys
• Dimensions: 23 x 18 x 12 cm
• Weight: 3.5 kg
• Internal rechargeable battery: 12V, 3 Ah
• Possibility of connecting an external 12V car battery
• Autonomy: 1000 readings typ.
• Operationg temperature range: -10° to +50°C

• G-Ohm console, instruction manual, data transfer cable and software.

SYSCAL Kid, entry level model for depths to 50m

Syscal Kid Resistivity Meter for shallow ground water studies, archaeology, and geologic mapping.

• Automatic ranging
• Direct resistivity reading
• Built in data logger
• Field proof

• Shallow ground resistivity
• Archaeology surveys
• Civil engineering
• Geological mapping

Specifications:

Transmitter Specifications

• Automatic current setting
• Accuracy: 1%
• Maximum Output Current: up to 500mA
• Max. Output Power: 25W
• Max. Output Voltage: 200V (400V peak to peak)
• Pulse Duration: 0.5s, 1s and 2s

Receiver:

• Resistivity computation
• Automatic ranging
• SP compensation including linear drift
• Digital stacking for noise reduction
• Input Impedance: 22 Mohms
• Input over voltage protection up to 200V
• Input Voltage Range: -2.5V to +2.5V
• Resistivity range: 0.001 to 100,000 Ohm meters
• Resistivity precision: 1% typical

Miscellaneous:

• LCD display of 4 lines, 20 characters
• Keypad: 6 functions keys
• Dimensions: 23 x 18 x 12cm
• Weight: 3.5kg, including battery
• Power Supply: Internal 12V rechargeable battery, or external 12V
• Operating Temp. Range: -10°C to +50°C
• Internal rechargeable batter: 12V, 3Ah
• Autonomy: 100 readings typical
  Internal memory of 2000 readings with full readings: sp, voltage, current, resistivity

Syscal Kid console, instruction manual, data transfer cable and software.

SYSCAL Junior Resistivity Meter, depths to 100m

Syscal Junior resistivity meter for ground water exploration and contaminant studies, grounding measurements, and geologic mapping.

Features

• Unique 2 channel design measures both voltage and current simultaneously
• Maximum voltage 800 V Peak to Peak
• Maximum output current 1.2 A
• Compatible with automated electrode switching system
• 20 Bit A/D converter
• Chargeability / IP Measurements

The Syscal Junior resistivity meter is an ideal instrument for applications with depths of investigation in the range of 100 meters or less. The 100W transmitting power is quite adequate at these depths and the light weight of the Junior resistivity meters, only 7 kg with internal battery, makes easy work of moving along your profile. The combined transmitter/receiver unit is micro processor based and features a large, easy to read LCD display.

Measurement is fully automatic. Pressing the Start/Stop key to initiate a measurement will first cause the SP value to be measured and then stored. The Junior will then display the average values of voltage and current, with standard deviation, until the stop key is pressed. If the operator has selected the appropriate electrode array and spacing parameters the apparent resistivity value is calculated. Memory storage for 1000 sets of readings with all related parameters is provided.

The SP value is displayed so that noisy conditions may be observed. SP compensation is recalculated during stacking with every third stack, providing excellent linear drift correction. Automatic ranging during digital stacking improves noise reduction. A 20 bit A/D converter is used to provide the best resolution and highest quality data.

Power is supplied from internal rechargeable battery, or external 12V. The battery charger is external and may be switched between 110 or 220V. Typical operation time on the fully charged internal battery is greater than 3,000 cycles. Data transfer is provided by standard RS232 port.

The unique two channel design of the syscal resistivity meters, allows for measurement of both voltage and current during stacking. This provides the most optimized design to ensure the best data quality and noise rejection. Noise rejection is greater than 120 dB at power line frequencies. Voltage resolution after stacking is 1 microvolt, with accuracy of better than 0.5%.

Specifications:

Transmitter Specifications:

• Resolution: 10µA
• A/D Converter: 20 bit
• Accuracy: 0.5%
• Maximum Outout Current: 1.2 A
• Max. Output Power: 100W
• Max. Output Voltage: 400V (800V peak to peak)
• Pulse Duration: 0.5s, 1s and 2s

• Voltage Measurement Specifications:
• Resolution: 1µV after stacking
• Accuracy: 0.5%
• Output Impedence: 10 Mohms
• Input overvoltage protection up to 1000 V
• Input Voltage Range: -10V to +10V
• Automatic SP Bucking: (-10V to +10V) with linear drift correction (up to 1 mV/s)
• 50Hz and 60Hz power line rejection
• Continuous Digital Stacking: up to 250 stacks

• LCD display of 2 lines, 20 characters
• Weather resistant case
• Dimensions: 31 x 21 x 25cm
• Weight: 7kg, including battery
• Power Supply: Internal 12V rechargeable battery, or external 12V
• Operating Temp. Range: -20°C to +70°C
• Storage Temp. Range: -40°C to +80°C

• Syscal Junior resistivity meter console, instruction manual, data transfer cable and software.

SYSCAL R1 Plus Resistivity Meter, depths to 200m

Syscal R1 Plus Resistivity Meter for deep ground water exploration, geologic mapping, IP surveys, grounding studies. Now with 200W of Power.

Features:

• Measures voltage & current simultaneously
• 200 W new Output Power
• 1200 V Peak to Peak
• 2.5 A Maximum Current
• Automated Electrode Switching System Available
• 20 Bit A/D Converter
• Chargeability / IP Measurements

The Syscal R1 Plus resistivity meter is the most powerful, internally powered, transmitter/receiver unit available for DC resistivity applications. It features 200W output and may be powered from internal rechargeable battery, or external 12 V. Surveys to depths of 200 meters can be achieved with confidence.

The unique two channel design of the Syscal resistivity meters permits measurement of voltage and current simultaneously. This results in an instrument with very high accuracy and freedom from noise. Noise rejection is better than 120 db at power line frequencies. A 20 bit A/D converter provides excellent resolution and data quality.

The large, high contrast, LCD screen, with large keypad, allow the R1 to be used easily in field conditions. The case is fully watertight, with the only access through the top keypad, which is protected by O ring seals.

At the start of each measurement the SP value is displayed. This value is also stored with each reading. SP compensation is automatic, with linear drift correction, using digital filtering. The SP value is measured during stacking with every third stack, and his new value is then used for applying the SP correction. This results in very accurate correction of the SP drift reading.

Automatic ranging during digital stacking improves noise reduction. Up to 250 stacks may be done per measurement. During stacking a running average of voltage and current permits the operator to observe data quality. Standard deviation for each measurement is stored with the reading.

With input of type of array, and geometrical electrode spacing values, the R1 will calculate and store the apparent resistivity. Up to 1,000 measurements are stored, with voltage, current, resistivity, geometrical parameters, and a station number. Data transfer is provided by serial link.

Power is supplied from internal rechargeable battery, or external 12 V. The battery charger is external, and compatible with either 110 or 220 V. Typical field operation time from the internal battery is more than 3,000 readings.

The Syscal R1 Plus resistivity meter is compatible with the automated electrode switching unit called the Intelligent Node System. With this system the operator can design the array and sampling routine desired, then download this to the R1 for execution in the field. Up to ten arrays may be preprogrammed and downloaded to the R1. In the field these are recalled, and minor adjustments may be made, such as number of stacks. Each array may be run for whatever number of profiles are needed, up to the capacity of the memory storage. Back in the office, files are uploaded, and results are automatically displayed. Multiple profiles may be merged to create the final color pseudosection.

The Syscal R1 Plus resistivity meters are unmatched in power output, and unmatched in data quality, thanks to its unique two channel design. This design, which permits the simultaneous measurement of both voltage and current, allows accurate readings to be made, even in noisy conditions. Be sure to specify this two channel design when you want the best data available.

For compatible modeling software see the Resix Plus package.

Specifications:

Transmitter:

• Resolution: 10µA
• Accuracy: 0.3%
• Max. Output Current: 2.5 A
• Max. Output Power: 200 W new
• Maximum Output Voltage: 600V (1200V peak to peak)
• Pulse Duration: 0.5s, 1s and 2s

Receiver:

• Voltage Measurement Specifications:
• Resolution: 1 µV after stacking
• A/D Converter: 20 Bit
• Accuracy: 0.3%
• Output Impedance: 10 MOhms
• Input over voltage protection
• Input Voltage Range: ± 10V
• Automatic SP Bucking: (±10V) with linear drift correction (up to 1 mV/s)
• 50Hz and 60Hz power line rejection
• Continuous Digital Stacking : Up to 250 stacks

Miscellaneous:

• LCD display of 2 lines, 20 characters
• Weather resistant case
• Dimensions: 21 x 31 x 21 cm
• Weight: 9.5kg, including battery
• Power Supply: Internal 12V 7Ah rechargeable battery or external 12V
• Operation Temp. Range: -20°C to +70°C
• Storage Temp.: -40°C to +80°C

Syscal R1 Plus resistivity meter console, batteries, transit case, data transfer cable and software.

SYSCAL Pro Ten Channel Resistivity Meter

Syscal Pro ten channel resistivity meter for deep ground water exploration, ERT monitoring systems, and marine resistivity applications.

• Ideal for deep groundwater surveys
• Marine surveys
• Remote monitoring
• Optional Imaging configurations

The Pro features a graphics screen with display of the IP curve. Up to 20 IP windows may be selected either automatically or with user defined slices. GPS integration is standard allowing recording of the location of the meter, or when in continuous marine acquisition mode, allowing continuous position recording. The internal clock features two alarms so that an array be run at future operator specified times. The Pro is available as an automated sampling imaging system with up to 96 electrodes supported internally, and up to 4,000 electrodes supported through the use of external switch boxes. Please see Syscal Pro Switch Imaging System for further details.

Automatic injection ranging, so that the voltage does not need to be selected is standard, as is the simultaneous measurement of both voltage and current, for the most accurate resistivity measurements. Input impedance is 100MOhm. Noise rejection through automatic SP compensation, with real time filtering, provides high quality data even in culturally noisy conditions. Notch filters for 50 and 60Hz are standard. Automatic calculation of apparent resistivity is made when user selects appropriate array type and spacing. Memory storage for 21,000 readings is standard.

Software to permit marine acquisition is standard. This software, running on a local PC, allows recording of GPS position and display of pseudo sections while collecting data. The marine cable is plugged into the top of the instrument, with a typical cable configuration of 13 stainless steel, or optionally graphite, electrodes spaced at 25m.

Software for data transfer, formatting, and processing is supplied as standard. This software allows output of data file for all commercially available modeling programs for 1, 2, or 3D inversion, including IP modeling. Ability to filter output data file for such variables as excluding readings with standard deviations in excess of user defined limits, ability to input topographic data, and to create pseudo section file to output to Surfer for contouring is standard.

Output Specifications:

• Automatic injection ranging, microprocessor controlled.
• Current, up to 2.5A.
• Voltage, up to 1,000V(2,000V peak to peak), or up to 1,500V(3,000V peak to peak) with external converter.
• Power, up to 250W standard, up to 1,200W with external optional converter.
• Pulse Duration, 0.2, 0.25, 0.5, 1, 2, 4, or 8 seconds.
• Current Precision, 0.2% typical.

• Input Impedance, 100MÙ.
• Input voltage, Channel 1 is 15V, Channels 2-10 are additional 15V, input protection 1,000V.
• Notch Filters, 50 and 60Hz.
• Voltage Measurement, precision 0.2% typical, resolution 1 microV.
• Automatic Stacking and Averaging to operator specified standard deviation.
• Automatic SP correction with linear drift correction on every third stack, with real time digital filtering.
• Induced Polarization, total chargeability plus 20 automatic or user defined slices.

• Data flash memory for 21,000 readings.
• Serial link RS232 data transfer.
• Operating Temperature, -20 to +70?C.
• Weight, 10Kg, Size 31 x 23 x 23cm.
• Power supply, 2 internal rechargeable 12V 7.2Ah batteries, with external 12V available.