212 Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter
Troubleshooting
Check Items When Trouble Occurs
12-
An overload message (OVLD) is displayed (when nothing is connected to the
UNKNOWN terminal).
This is normal operation. An overload is often detected by the E4981A when
nothing is connected to the UNKNOWN terminal.
Beeping persists when turning ON the comparator function.
• Check if the limit range is set up properly.
When the beep is set up to sound when the comparator function is ON
(initial setup), 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.
• Check if the instrument is in the remote mode.
If the E4981A 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.
The measured value is abnormal.
• The measurement of correction data may have failed.
Measure the correction data again. For how to measure the correction data,
refer to “Obtaining Correction Data” on page 98.
• When the MULTI correction is ON, check that the channel and the definition
method of the LOAD standard value are selected correctly.
Saving to USB memory fails
Some USB memory does not work with the E4981A. For more information on
USB memory, refer to “USB interface port” on page 195.
An error message or warning message is displayed.
For information on error messages and warning messages, refer to Appendix
D.
If the keys have been locked through the handler interface, you cannot
unlock them by using the front panel keys. Set the /KEY_LOCK signal of the
handler interface to HIGH.
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