Triplett 2000 - Manual (Page 15)

Page 15
3.6 Battery and Fuse Test
Before using the Test Set, and frequently during use, the batteries
and fuses in the Test Set should be tested. Refer to Section 3.7 for
instructions on installing and/or replacing the batteries and fuses if
necessary.
3.6.1 9V Battery Test
Place the Test Set Range Switch in the OFF position. Depress and
hold the Push For Ohms Switch. The Pointer will deflect upscale
and the red NEG Indicator will light. If the Pointer fails to deflect into
the blue BATT OK scale, then both 9V batteries must be replaced.
Replace the batteries if necessary, then repeat this test. Proceed to
the Fuse Test (Section 3.6.2) only after successfully passing this test.
3.6.2 Fuse Test
The Test Set contains two fuses. Both must be tested and found
good for safe operation of the instrument.