Keysight E4991B - To Check the Mouse; To Check the External Monitor Output Port; To Check the External Trigger Input

Troubleshooting 1
Impedance Analyzer 31
Step 3. Press and keys on the external keyboard, and
verify that the cursor on the menu bar moves up and down. If it
doesn’t work, the external keyboard or the A80 CPU Module may
be faulty.
To Check the Mouse
Procedure
Step 1.
Connect a mouse to the Keysight E4991B rear panel
USB port.
Step 2. Verify that the mouse buttons work normally. If any
button does not work or the mouse pointer does not move, a
failure in the mouse or the A80 CPU Module is suspected.
To Check the External Monitor Output Port
Procedure
Step 1.
Connect an external VGA color monitor to the External
Monitor Output Port on the Keysight E4991B rear panel.
Step 2. Turn the external monitor on.
Step 3. Verify that the monitor screen view is the same as the
display on the LCD. If the monitor screen view is abnormal, a
failure seems to be in the A80 CPU module.
To Check the External Trigger Input
Procedure
Step 1.
Press key.
Step 2. Press Trigger Mode key.
Step 3. Click External in the menu bar to set the trigger mode
to External.
Step 4. Connect a BNC Short or 50 ohm termination to the
External Trigger Input Port on the rear panel and disconnect it. A
measurement trigger should be generated and a measurement
result should be refreshed.
Step 5. If no trigger occurs, a failure in the A51 DSP board is
suspected.