Maintenance; Cleaning; Calibration; How To Test The Fuse - Fluke 78 User Manual

78
Users Manual

Maintenance

Cleaning

Periodically wipe the case with a damp cloth and deter-
gent; do not use abrasives or solvents.

Calibration

Calibrate the meter yearly to ensure that it meets its per-
formance specifications. Calibration and performance test
procedures are in the 78 Service Manual (PN 666617).

How to Test the Fuse

Test the meter's fuse as shown in Figure 19.

How to Replace the Battery or Fuse

Warning
To avoid false readings, which could lead to
possible electric shock or personal injury, re-
place the battery as soon as the battery indi-
cator (U) appears.
To avoid electric shock or personal injury
Do not allow water to get inside case
Remove any input signals prior to re-
moving test leads and opening case
When servicing the meter, use ONLY
specified replacement parts. See Table 4
for part numbers.
Replace fusible resistor R1 ONLY with
specified replacement part.
Install only specified replacement fuses.
42
Caution
To avoid damaging components, do not lift
the battery straight out. Lift the end of the
battery as shown in Figure 20.
Replace the battery and fuse as shown in Figure 20. The
meter uses a 9 V battery and a F15 A 600 V fuse. To
avoid contamination or static damage, do not touch the
rotary switch or circuit board.
For safety, replace the fuse only with a fuse having a
minimum interrupt rating of 10 kA (Fluke Part No.
820829). Do not bypass the fuse.

Accessories and Parts

When servicing the meter use only the replace-
ment parts specified in Table 4.
Replacement parts are shown in Figure 21. Parts and ac-
cessories are listed in Table 4.
To contact Fluke, call one of the following telephone num-
bers:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: +31 402-678-200
Japan: +81-3-3434-0181
Singapore: +65-738-5655
Anywhere in the world: +1-425-446-5500
Or, visit Fluke's Web site at www.fluke.com.
Note