7351 Series Digital Multimeter Operation Manual
8.8 Notes Regarding Repair, Replacement, and Periodic Calibration
8-15
8.8 Notes Regarding Repair, Replacement, and Periodic Calibration
8.8.1 Before Asking for Repair
Before asking for repair, refer to and check Table 8-3.
Table 8-3 Before Asking for Repair
Problem Check item Solution
The power supply
cannot be turned on.
Check the power cable. Change the power cable.
Check the power fuse. Replace the power fuse.
Key malfunction. Check whether the RMT indicator is on (in
remote operation).
Press the LOCAL key to return to the local
state.
Panel lock functions. Release the panel lock.
Voltage and resis-
tance cannot be mea-
sured.
Check that the input cable is correctly con-
nected to the V and COM terminals.
Securely connect the input cable to the V
and COM terminals.
Check whether the input cable is in good
condition and not broken.
Change the input cable.
Current cannot be
measured.
Input terminals differ depending on the mea-
surement range.
Check that the input cable is correctly con-
nected to the current input terminals.
200 mA and 2000 mA ranges: mA and COM
terminals
10 A range: 10 A and COM terminals
Securely connect the input cable to the cor-
rect terminals.
Check whether the protection fuse is service-
able and not open.
(For more information on how to check, refer
to 8.1, “Replacing Fuses”.)
Replace the fuse.
For the 10 A terminal, contact ADC COR-
PORATION or a sales representative to
repair this instrument.
Check whether the input cable is in good
condition and not broken.
Change the input cable.
For the high-resis-
tance measurement,
the measurement
value is not stable.
Induction noise is superimposed on the input
cable.
Shield the DUT.
Use a shielded input cable.
Check that the power supply frequency set-
ting is the same as the local commercial
power supply frequency.
Correctly set the power supply frequency to
50 Hz or 60 Hz.
Sampling does not
operate.
Check whether the HOLD indicator is on (in
HOLD operation).
Press the TRIG or HOLD key and check
whether sampling operates.
(During the remote operation, panel keys do
not function. Therefore, after releasing the
remote operation, press any panel key.)
A long trigger delay time is set. Check the trigger delay time.
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