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5.3 Battery Replacement
a. Two batteries are used inside the case to supply power for resistance mea-
surements. One is a 1.5-volt D cell and the other is a 9-volt battery. When it
is no longer possible to adjust the pointer to zero for the R X 1 and R X 100
ranges (refer to ZERO OHMS ADJUSTMENT paragraph 4.20), replace the
1.5-volt cell. When it is no longer possible to adjust the pointer to zero on the
R X 10,000 range, replace the 9-volt battery.
b. To install or replace a battery, de-energize and disconnect test leads from the
Instrument, then remove the cover to the externally accessible battery com-
partment by loosening the single captivated screw.
NOTE: Batteries should be replaced before their useful life has expired.
Failure to do so may result in corrosion and battery leakage.
c. Observe polarity when replacing the 1.5-volt D cell and connect as indicated.
The D cell is held in place with spring clips which also act as battery contact
clips. The 9-volt battery contacts and connector are polarized. To remove the
9-volt battery, first withdraw battery with mated connector from the compart-
ment. Then remove the connector.
5.4 Fuse Replacement
The 1 and 2 ampere fuse (also the 1A spare) is located in the externally acces-
sible battery and fuse compartment. Access to the compartment is obtained by
disconnecting the test leads and loosening the single captivated screw on the
compartment cover. To replace or check a fuse: Apply pressure to the 1 amp fuse
cup then rotate the plate to expose a selected fuse for removal from the panel’s
cavity.
NOTE: When replacing fuses, it is important to use the same type and value as
the ones you have removed.
5.5 Test Lead Inspection
Periodic inspection of the test leads is recommended to detect cuts, burned ar-
eas, deterioration or other damage that could reduce the insulation strength of
leads.
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