Battery Replacement - AEMC 3710 User Manual

Q. Can the clamp-on method be used for substation grid resistance
testing?
A. It depends. It can be used as long as the instrument can be clamped
onto a point on the grounding system at a common point where it ties
to the system neutral. Testing a grid must be treated as if it were a
single electrode. Often, clamping on to points within the grid system will
yield a closed loop reading.
Q. How does clamp-on ground testing compare with the standard
"Fall-Of-Potential" test?
A. Empirical testing has validated that when performed correctly, both
methods will provide accurate and repeatable readings for ground elec-
trode resistance.
Q. How large a conductor can the jaw accommodate?
A. The inner diameter of the jaw is 1.25" and can accommodate cables
up to 1000 MCM.
Battery Replacement Procedure
The Clamp-On Ground Resistance Testers are powered by a single 9
volt battery. The battery replacement indicator will display continuously
when battery replacement is required.
Recommended replacement type is Alkaline (IEC 6LF22, 6LR61 or
NEDA 1604A). Ni-Cad batteries may also be used. To change the bat-
tery refer to figure 15, page 17 and follow this procedure.
1. The instrument must be OFF and disconnected from any conductor.
2. Place the meter face down and remove the two Phillips screws on
the back of the instrument.
3. Remove back cover by pulling it down and away from the instrument.
4. Lift the battery away from the case and disconnect the battery.
5. Connect the new battery and position the leads so that they won't get
pinched when the cover is replaced.
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Ground Resistance Tester Models 3710/3730