Simpson 270 Series - Page 53

Operator Servicing
the pointer to zero for the R X 1 and R X 100 ranges (refer to
ZERO OHMS ADJUSTMENT paragraph 4.19) replace the
1.5-volt cell. When it is no longer possible to adjust the pointer
to zero оп the R x 10,000 range, replace the 9-volt battery.
. Recommended replacement batteries are:
1.5 volt D, NEDA 13F (Burgess Мо. 2 Eveready No. 950). >
9-volt battery, NEDA 1604 (Burgess 2U6 or Eveready 216).
. To install or replace a battery, de-energize and disconnect test
leads from the Instrument, then remove the cover to the ex-
ternally accessible battery compartment by loosening the single
captivated screw.
NOTE: Batteries should be replaced before their useful
life has expired. Failure to do so may result in
battery leakage and corrosion.
. Observe polarity when replacing the 1.5-volt D battery and con-
nect as indicated. The D battery is held in place with spring clips
which also act as battery contact clips. The 9-volt battery con-
tacts and connector are polarized. To remove the 9-volt battery,
first withdraw battery with mated connector from the compart-
ment. Then remove the connector.
FUSE REPLACEMENT
5.4.1 The | and 2 ampere fuse (also the 1A spare) is located
in the externally accessible battery and fuse compartment. Access
to the compartment is obtained by de-energizing and disconnect-
ing the test leads and loosening the single captivated screw on
the compartment cover. To replace or check a fuse: Apply pres-
sure to the 1 amp fuse cup then rotate the plate to expose a
selected fuse for removal from the panel's cavity.
5-2