An Overload Message Is Displayed; Beeping Persists When Turning On The Comparator Function; The Front Panel Keys Are Unavailable - Keysight E4980A User Manual

Troubleshooting
Check Items When Trouble Occurs
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When the normal measurement screen does not appear, there is the possibility
of a failure. Contact Keysight Technologies's Customer Contact, listed at the
end of this guide, or the company from which you bought the device.

An overload message is displayed

An overload is often detected by the E4980A/AL when nothing is connected to
the UNKNOWN terminal.
For conditions where overload occurs, refer to
Measurement Results" on page
If the measurement/DCR/DCI ranges are set at Hold, enable the auto to select
the optimum range. Then set the range at Hold. This may solve a overload.

Beeping persists when turning on the comparator function

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The front panel keys are unavailable

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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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When the power is turned on with the interface board of the E4980A/AL
rear panel removed, the E4980A/AL enters the service mode. In this case,
reset the interface board and then turn the power on.
The E4980A/AL also enters the service mode when the interface board isn't
set properly.
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.
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 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.
"Displaying Errors instead of
71.
Keysight E4980A/AL Precision LCR Meter