K4105A
side 34
3. Simplified Measurement
Set the range switch to 2000Ω position and press the test button. LED remains
illuminated during testing. Turn the range switch to 200Ω 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
Battery Replacement
DANGER
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.
CAUTION
Do not mix new and old batteries.
Install 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.
