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True-rms Digital Multimeters
Maintenance
57
Maintenance
XWWarning
To avoid electrical shock or personal injury,
repairs or servicing not covered in this manual
should be performed only by qualified personnel
as described in the 287/289 Service Information.
General Maintenance
Periodically wipe the case with a damp cloth and mild detergent.
Do not use abrasives, isopropyl alcohol, or solvents.
Dirt or moisture in the terminals can affect readings and can
falsely activate the Input Alert feature. Clean the terminals as
follows:
1. Turn the Meter off and remove all test leads.
2. Shake out any dirt that may be in the terminals.
3. Soak a clean swab with mild detergent and water. Work the
swab around in each terminal. Dry each terminal using
canned air to force the water and detergent out of the
terminals.
Testing the Fuses
As shown in Figure 28, with the Meter in the S function, insert
a test lead into the W jack and place the probe tip on the
other end of the test lead against the metal of the current input
jack. If the “Leads Connected Incorrectly” message appears, the
probe tip has been inserted too far into the amps input jack. Back
the lead out a bit until the message disappears and either OL or
a resistance reading appears in the Meter’s display. The
resistance value should be between 0.00 and 0.50 Ω for the A
jack and 10.00 ±0.05 kΩ for the € jack.
XWWarning
To avoid electrical shock or personal injury,
remove the test leads and any input signals before
replacing the battery or fuses. To prevent damage
or injury, install only Fluke specified replacement
fuses with the amperage, voltage, and speed
ratings shown in Table 11.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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