Recently I brought a second-hand Keithley 2110 from eBay, and did Self Test. It reports Error 602 "RAM read/write failed". I checked the reference manual, it says:
"Error 602: This test writes and reads a 55h and AAh checkerboard pattern to
each address of RAM U1701. Any incorrect read back will cause a test
failure. This error is only readable from the remote interface."
Just wonder if anyone of you happened to experience the similar problem with Keithley DMM and how you fixed this problem.
Any suggestion is highly appreciated.
BWT, how to check the manufacture date from serial no?
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