You REALLY don't want to mess with that 24 pin NVRAM chip... it contains the
calibration memory. If you bugger the data in it, you get to spend a couple
of grand getting the meter back into working order. I know a couple of people
that did just that.
The solution is to first make a backup copy of the memory contents using the
(undocumented) MREAD command over the GPIB bus. Poul-Henning Kamp figured out
how to do it... buy the man a beer... even better a case of beer... Search
the archives for details.
I just backed up all the memory in my 3 HP3458A's for when the inevitable BIG
BAD DAY comes and the backup batteries go bye-bye. If you happen to have a NI
GPIB-232CV-A (or possibly a Prologix) RS-232 to GPIB converter and can run a
DOS or WIN98 program, I have a program that dumps the memory chips. It has
code for the Prologix in it, but I've only used it with my a Prologix
compatible unit I built... I don't have a real Prologix to test it with.
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