Suddenly, I press the "mode" and "mode setup" of E4438C, the screen shows "options not installed" ? Just before the moment，they were work well. And the result of instrument selftest are shown in the below figure.
The "options not installed" message implies the power up configuration did not complete properly. This will happen if a board does not communicate it's identification during power up. You must have option UN7 or 300 if you have a BERT board failure. Check the installed board list and make sure it correlates with the boards installed. It's possible you could just have a dirty connection, so you could try re-seating the boards in the digital card cage.
I had the same problem, Opening the case and re-seating the boards fixed the problem for me.
Retrieving data ...