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Chapter 4 Measurement Procedure
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NOTE
(6) Earthing resistance measurement
Set the function switch to a suitable position (
x10Ω,x100Ω) and press the measurement
button (
PRESS ON
).
While keeping the button depressed, turn the
dial knob until the galvanometer is balanced.
Then read the indication on the resistance dial
and multiply it with the setting of the range
selector. The result is the earthing resistance.
Measurement result = Rx+Ro (combined
resistance)
In general, you should first choose the
x100Ω setting of the range selector and
then reduce the setting as necessary.
If the 2/3 pole measurement selector
(
TERMINALS) is set to "3a"or"3b", correct
measurement is not possible. Since the
measurement current will be higher in a
position for 3-pole measurement, the leakage
current circuit breaker of a household power
supply may be tripped.
Balancing the galvanometer is invalid where
no scale on the resistance dial.
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