Technical Specifications - TENTECH MTD 20KWe Manual De Uso

4. Technical Specifications

Application
Resistance
measurement method
Immunity to interference
Operation as a voltmeter
Measurement ranges
Accuracy
: Measurement of
terminals), soil resistivity (4 terminals) and
spurious voltages present in the soil.
: 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.
Resistance value.
: Operation frequency: 1470 Hz
This operation frequency complies with the
equation:
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.
: 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.
: Resistances: 0-20Ω; 0-200Ω; 0-2,000Ω; 0-20kΩ
Voltage: 0-200V∼
: 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)
20
grounding resistances
Display shows
(3
the