10
3. Ground voltage measurement
One auxiliary grounding rod is required for the ground voltage test.
As long as the instrument is connected to the ground through the test
wire and the auxiliary grounding rod, the other test wires of the
instrument interface cannot be connected to the L and N wires of the
commercial power supply. Otherwise, the leakage may occur, and the
circuit breaker may start up and be dangerous.
Ground voltage test cannot exceed 600V.
Grounding voltage: when the ground fault of the electrical equipment
occurs, the potential difference between the grounding device casing, the
grounding wire, the grounding body and the zero potential point, the
grounding voltage is the reference point of the ground, the potential difference
from the earth, and the earth is zero potential point.
An auxiliary grounding rod is required for the ground voltage test. Note
the difference from the commercial AC voltage test. See the following figure:
After the meter, auxiliary grounding rod, and test line are all connected, after
turning on the power, turn the function selection key to U. The LCD shows the
test result.
4
．
Wire Resistance Verification
In order to improve precision and stability of field measurement of earth
ground resistance, avoid error due to wire resistance change due to prolonged
usage of testing wires; avoid error due to testing wire that is failed to be fully
inserted into tester interface or by poor contact; avoid error due to users
’
replacing or lengthening testing wires and etc., wire resistance verification is
specially designed, which is more accurate on low value resistance
measurement.
As shown in the figure below, press the function button R button to switch
to the corresponding ground resistance measurement position, press
button to start verification. During verification, During the calibration, the
LED indicator flashes. The LCD counts down. After the calibration is
