428 Keysight E4980A/AL Precision LCR Meter
Troubleshooting
Check Items When Trouble Occurs
13-
Beeping persists when turning on the comparator function
o Confirm that the limit range is set up properly.
When the beep is set up to sound when the comparator function is on, the
beep sounds on every completion of measurement if the limit range is set
up improperly.
The front panel keys are unavailable
o Check if the keys are locked.
When the keys are locked, LOCK is displayed in the status display area in
the lower-right corner of the screen.
Press the [Local/Lock] key to unlock the keys.
o Check if the instrument is in the remote mode.
If the E4980A/AL is in the remote mode, RMT is displayed in the status
display area in the lower-right corner of the screen.
Press the [Local/Lock] key to clear the remote mode.
Clearly abnormal measured value
o Measurement of compensation data may have failed.
Measure the compensation data again. For how to measure correction data,
refer to“CORRECTION page” on page 112.
For example,
— setting up the OPEN state and SHORT state inversely.
— the OPEN/SHORT/LOAD is connected incompletely.
— previous correction data is used.
— after correction, different length cable/different fixture is connected or
settings of frequency/level is changed.
For those cases, connect OPEN/SHORT/LOAD properly or fixture/cable
properly and then perform the correction with new conditions.
o If the measured value is still abnormal even after taking the above measure,
turn off the correction function.
When the E4980A/AL enters a local lockout state by sending the LOCAL
LOCK BUS command from the controller, you cannot unlock the remote
mode even if you press the [Local/Lock] key. (Only RMT is displayed in the
status display area, so you cannot distinguish the local lockout state from
a normal remote mode.)
Send the LOCAL BUS command from the controller to cancel this state,
which enables control of the E4980A/AL on the front panel.
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