Amprobe GP-2 GEOTEST Ground Resistance and Resistivity

	*Model GP-2 GEOTEST*
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GP-2 GEOTEST Ground Resistance and Resistivity Tester

Benefits

Three point test (fall of potential) measures earth ground resistance as required by equipment manufacturer specifications and as mandated by national code requirements for proper grounding.
Two point test is used to test grounding wires resistance and resistance of connection points between ground system elements i.e. wires and electrodes.
Tests soil for a new ground system design.
Does not require any additional meters to test voltage before grounding test is performed.
Easy to operate.
Data can be stored for later viewing.
Downloads data to a personal computer to generate reports and store historical data.

GP-2 GEOTEST Ground Resistance and Resistivity Tester

Features

Measure Earth Ground Resistance (Ω).
Automatically Calculate Resistivity (mΩ).
Test leads, auxiliary electrodes and software are included for a complete instrument.
Voltage measurement.
Automatically applies three testing frequencies for the most accurate readings.
Auto ranging.
Stores up to 999 measurements in the memory.
DATA download to a PC (via RS-232).

Specifications (23°C ±5°C, <80% R.H.)

Resistance Measurement:

*Range ()**	Resolution	Accuracy()**
0.01Ω to 19.99Ω	0.01Ω	±(2% of Rdg + 3 digits)
20.0Ω to 199.9Ω	0.1Ω	±(2% of Rdg + 3 digits)
200Ω to 1999Ω	1Ω	±(2% of Rdg + 3 digits)

Resistivity Measurement p

*Range ()**	Resolution	Accuracy()**
0.6Ωm to 125.6Ωm	0.1Ωm	±(2% of Rdg + 3 digits)
0.125Ωm to 1.256kΩm	0.001kΩm	±(2% of Rdg + 3 digits)
1.25kΩm to 19.99kΩm	0.01kΩm	±(2% of Rdg + 3 digits)
20.0kΩm to 199.9kΩm	0.1kΩm	±(2% of Rdg + 3 digits)

(*) Automatic selection of the range

(**) If R_p > 100R_E and/or R_c > 100RE, R_p > 50kΩ and/or R_C > 50kΩ, if the instrument carries out the test the accuracy of the instrument is ±(10% of reading).

R_p = resistance of the voltage circuit.
R_c= resistance of the current circuit.
R_E = earth resistance
p = 2ΠDR_E = calculated resistivity

Testing Frequency	125Hz, 75Hz, 41.66Hz
Test Current	10mA
Open-terminal Measuring Voltage	25Vrms
Waveform of Measuring Voltage	Sine-wave

Interfering Voltage:

Amperometric circuit: The measurement is taken with the stated accuracy if the interfering voltage is ≤ 3V, while for interfering voltages between 3V and 30V inclusive, the accuracy decreases progressively; with an interfering voltage of about 30V the instrument does not perform the test.

Voltmetric circuit: The measurement is taken if the interfering voltage is ≤ 3; in case of higher voltages the instrument does not perform the test.

Range	Resolution	Accuracy()**
500V	1V	±(2% of Rdg + 2 digits)

General Specifications

Display	65mm x 65mm LCD
Memory	999 memory locations
Interfaces	Opto-insulated serial output RS-232 (to transfer data to a PC)
Operating Temperature	-10°C to 50°C, <80% R.H.
Storage Temperature	-20°C to 60°C, <70% R.H.
Safety	EN 61010, EN 61557-1, EN 61557-5 standards
Insulation	Class 2, double insulation
Pollution	2
Surge Voltage Category	CAT III 250V (phase to earth)

Power Supply	Six 1.5V size 'AA' batteries (LR6, AM3, MN 1500)
Battery Life	300 measurements approx.
Auto Power Off	Yes
Low Battery Indication	Yes

Dimensions	8.74" (L) x 6.38" (W) x 2.25" (D)
Weight	1000gms (2.2 lb)

Included Accessories

Four each Earth Rods and cables with banana/crocodile clips, Carrying case, Optical serial cable and operators manual.