Replacing Fuses; Cleaning; Input Terminals - Fluke 80 SERIES III Service Information

Replacing Fuses

To avoid electrical shock, remove the test leads and any input
signals before replacing the battery or fuses. To prevent
damage or injury, INSTALL ONLY quick acting fuses with the
following Amp/Volt current interrupt ratings:
F1 Fuse: 0.440 A, 1000 V, FAST. Minimum interrupt rating 10,000 A
F2 Fuse: 11 A, 1000 V, FAST. Minimum interrupt rating 17,000 A
To replace the Meter's fuses, refer to Figure 2 and do the following:
1. Turn the rotary switch to
2. Remove the battery door by using a flat-blade screwdriver to turn the battery door
screws 1/4-turn counterclockwise.
3. Remove the three Phillips-head screws from the case bottom and turn the case over.
4. Gently lift the input terminal-end of the case top to separate the two halves of the
case.
5. Remove the fuse by gently prying one end loose, then sliding the fuse out of its
bracket.
6. Replace the fuse only with one specified above.
7. Verify that the rotary switch and the circuit board switch are in the
8. Place the case top on the case bottom, ensuring that the gasket is properly seated and
the case halves snap together above the LCD end. (See Figure 2.)
9. Reinsert the three case bottom screws and the battery door.

Cleaning

To avoid electrical shock or damage to the Meter, never allow
water inside the case. To avoid damaging the Meter's housing,
never apply solvents to the Meter.
If the Meter requires cleaning, wipe it down with a cloth that is lightly dampened with
water or a mild detergent. Do not use aromatic hydrocarbons, chlorinated solvents, or
methanol-based fluids when wiping down the Meter.

Input Terminals

Water, dirt, or other contamination in the
Input Alert beeper even though test leads are not inserted. Such contamination might be
dislodged by turning the Meter over and, with all test leads removed, gently tapping on
the case.
To clean the input terminals more effectively, do the following:
1. Turn the Meter off and remove all test leads from the terminals.
2. Use a clean swab in each of the four terminals to dislodge and clean out the
contamination.
WWarning
and remove the test leads from the terminals
OFF
WWarning
mA µA
A or
position.
OFF
input terminals may activate the
Multimeters
Basic Maintenance
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