Application
Measurement of grounding resistances (with 3 terminals), soil resistivity (with 4 terminals) and spurious voltages present in the soil.

Resistance measurement method
The equipment injects an electronically stabilised current in the soil, and measures, with high precision, the voltage developed in the soil by means of that current flowing through grounding diffusion resistances. Display shows the Resistance value.

Immunity to interference
Operation frequency: 1470 Hz
This operation frequency complies with the equation:

fg = [(2n + 1) : 2] x fi

Where:
fg = frequency of the current generated by the earth tester.
n = integer number.
fi = industrial frequency (50 or 60 Hz)
The compliance with this equation implies that the operation frequency will not coincide with any harmonic of the industrial frequency, in order to minimise the effect of parasitic currents present in the surveyed soils, by means of the use of appropriate filters.

Operation as a voltmeter
In the voltmeter function, the equipment operates as a AC conventional voltmeter, making ut possible to check the presence and to measure voltages generated by parasitic currents.

Measurements ranges
Resistances: 0-20 Ω; 0-200 Ω; 0-2.000 Ω and 0-20 kΩ
Voltage: 0-200 V~

Accuracy
Resistances measurements: ± (2% of the measured value + 1% of the maximum value of the selected range).
Voltage measurement: ± (2% of the measured value + 1% of end of scale value).

Reading resolution
0.01 Ω in the resistance measurement.
0.1 V in the voltage measurement.

Output power and Current
The output power is less than 0.5W, and the output current is limited to less than 15mA (Peak to peak)

Battery status checking
It makes it possible to verify the battery charge status under normal use conditions.

Audible alarm
It warns the operator in case that there are abnormalities in the current circuit, which make it difficult to obtain a reliable result.