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39/41B
Users Manual
54
Operational Test
Use any of the applications shown in this manual to verify volts, amps, and
watts measurability. For a full operational test, refer to the Service Manual
(P/N 601044).
If the Screen Flashes or is Blank at Power-Up
If the screen flashes or is blank at power-up, it may be caused by a low
contrast setting. If neither or the following procedures works, refer to “If Your
Tester Does Not Work” for instructions on returning the unit for repair.
If the instrument flashes a dark test pattern and then appears blank:
Tap
, then hold down for several seconds. A normal screen display
should appear. Adjust to the desired contrast, then tap
again to store the
setting.
If the screen is blank (no dark flash):
Check the batteries. If the batteries read below 1.1V, replace them. If the
screen is still blank, refer to “If Your Tester Does Not Work” for instructions
on returning the unit.
If Your Tester Does Not Work
If your Tester does not work, make the following basic checks:
• Examine the case for physical damage. If you detect damage, contact a
Fluke Service Center. (Refer to the list of service centers at the end of this
manual.)
• Are you testing a live circuit? Test on a known-live circuit.
• Check the batteries, test leads, and Current Probe. If necessary, replace
any of these items.
• Review applicable parts of this manual to make sure you are operating
the Tester correctly.
• When measuring current without the voltage test leads connected, you
must select A
for the phase reference (see Table 1).