Hioki RM3542-50, Instruction Manual

Page: 202 / 234

11.2 Cleaning
196
Before Returning for Repair
If abnormal operation occurs, check the following items.
Symptom Check Items
Nothing is shown on the
screen when the power
switch is turned on.
•
Is the power cord disconnected?
•
Are the connections made correctly?
Check that the power cord is
connected properly. (p. 22)
Keys do not work.
•
Is any key being held down?
•
Is the instrument in the key-lock state (M.LOCK or
F.LOCK is displayed)?
•
Is the remote control communication enabled (RMT
is displayed)?
•
Is the EXT. I/O KEY_LOCK signal asserted to Low
(ON)?
Verify the key operation.
Cancel Key-Lock: (p. 68)
Switch to the local control
(p. 116).
De-assert the KEY_LOCK signal
to High (OFF).
Measurement values are
not stable
•
Is the measurement object a power transformer or
other large inductance?
•
Are the probes and measuring object adequately
shielded?
"Appendix 3 Unstable Measure-
ment Values" (p. A3)
Measurement values are
shifted.
•
Is zero-adjustment ON?
•
Were the CUR and POT terminals connected
before contacting the measuring object?
•
Is the measuring object calibrated correctly?
•
Is a current of more than 10 mA not flowing to the
GUARD terminal?(The shell of the GUARD terminal
and that of the BNC terminal may have made con-
tact)
•
There may be a large thermal emf.
"3.6 Zero Adjustment" (p. 34)
If the cause is unknown
•
Try performing a system reset (p. 75). All settings are returned to their factory defaults.)
11.2 Cleaning
• To clean the instrument, wipe it gently with a soft cloth moistened with water or mild deter-
gent. Never use solvents such as benzene, alcohol, acetone, ether, ketones, thinners or
gasoline. Doing so may deform and discolor the case.
• Wipe the LCD gently with a soft, dry cloth.