(4) The reading obtained (Rx) is an approx. earth resistance value.
There is no need for external shorting since P and C terminals are
shorted by using the test leads specified for the simplified
measurement.
Fig. 2
(5) Rx = Re - re
Rx = True earth resistance
Re = Indicated value
re = Earth resistance or earth electrode
(6) Since the measuring current is as low as 2 mA, the earth
leakage breaker (ELCB) does not trip even if the earth side of
the commercial power supply with an ELCB is used.
* Follow the proper connection as shown in Fig. 1. The LED (red)
indicator will be lit. This proves, that a correct current circulation is
under its operation.
5. Maintenance
5.1 Battery replacement
When the symbol “
” appears on the display, replace the batteries
as follows:
1. Disconnect the test leads from the instrument and turn
off the power.
2. Use a screwdriver to unscrew the screw on back cover
then slide the cover, take out the batteries and replace
with new batteries type UM-3.
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