15
7. Battery Replacement
DANGER
CAUTION
● Never attempt to open the battery compartment cover, if the outer
surface of the instrument is wet.
●
Never attempt to replace batteries while making measurement. To avoid
shock hazard, turn the instrument off and disconnect the test leads and
the probes from the instrument before opening the battery compartment
cover.
● Do not mix new and old batteries.
● lnstall batteries in the orientation as shown inside the battery
compartment, observing correct polarity.
① Turn off the instrument and disconnect the test probes from the
terminals.
② Loosen two screws on the bottom of the instrument and remove the
battery cover.
③ Always replace all six batteries in correct polarity.
Battery : R6P (AA dry battery) x6
④ Put the cover back in place and tighten the two screws.
② Earth Voltage Measurement
Set the range switch to EARTH VOLTAGE position in the condition of
①. Earth voltage will be indicated on the display. Make sure that the
voltage is 3 V or less.
When the display reads more than 3 V, it may result in excessive
errors in earth resistance measurement. To avoid this, make
measurement after reducing the voltage by turning off the power
supply of the equipment under test etc.
③ Simplified Measurement
Set the range switch to 2000Q position and press the test button. LED
remains illuminated during testing. Turn the range switch to 200Q and
20Ω when the earth resistance is low. This indicated value is the earth
resistance of the earthed equipment under test.
Note : ◇ If the auxiliary earth resistance of auxiliary earth spike C is too
high to make measurement, the display reads ' ... '. Recheck the
connection of each test lead and the earth resistance of auxiliary
earth spike.
④ Simplified Measurement Value
Two-terminal method is used for simplified measurement. In this
method, earth resistance value re of earth electrode connected to
terminal P is added to true earth resistance value Rx and shown as
an indicated value Re.
Re = Rx +re
If the re is known beforehand, true earth resistance value Rx is
calculated as follows.
Rx = Re
-
re
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