• 3½ digits display
• Earth resistance measurement
• Spurious voltage measurement
• Resolution: 0.01 Ω
• Resistance reading: up to 20 kΩ
• Audible signal indicates anomalies in the current circuit
Application
Measurement of grounding resistances (3 terminals), soil resistivity (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: 1,470 Hz
This operation frequency complies with the equation:
fg = [(2n + 1)/2] x fi
Where:
fg = frequency of the current generated by the earth meter.
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 it possible to check the presence and to measure voltages generated by parasitic currents.
Measurement ranges
Resistances: 0-20 Ω; 0-200 Ω; 0-2,000 Ω; 0-20 kΩ
Tension: 0-200 V~
Accuracy
Resistances measurements:
± (2% of the measured value + 1% of the maximum value of the selected range).
Voltage measurements:
(2% of the measured value + 1% of end of scale value).
Reading resolution
0.01 Ω in the resistance measurement.
0.1 V din the voltage measurement.