Multimeters 
  Maintenance   
 35 
Maintenance 
XW Warning 
To avoid possible electric shock or personal 
injury, repairs or servicing not covered in 
this manual should be performed only by 
qualified personnel as described in the 
80 Series V Service Information. 
General Maintenance 
Periodically wipe the case with a damp cloth and mild 
detergent. Do not use abrasives 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 new swab with a cleaning and oiling agent 
(such as WD-40). Work the swab around in each 
terminal. The oiling agent insulates the terminals 
from moisture-related activation of the Input Alert 
feature. 
Fuse Test 
If a test lead is plugged into the mA/μA or A terminal and 
the rotary switch is turned to a non-current function, the 
Meter chirps and flashes “LEAd” if the fuse associated 
with that current terminal is good. If the Meter does not 
chirp or flash “LEAd”, the fuse is bad and must be 
replaced. Refer to Table 8 for the appropriate 
replacement fuse. 
To test the quality of the fuse before measuring current, 
test the appropriate fuse as shown in Figure 10. If the 
tests give readings other than those shown, have the 
Meter serviced. 
XW Warning 
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 
specified replacement fuses with the 
amperage, voltage, and speed ratings shown 
in Table 8.