Hi Greg,
Yes, unfortunately the ER1400 is rather difficult to deal with outside
the chassis or without the GPIB option. Programmers to read and write
it were far and few between, and virtually non-existent today. If you
search around you can find some published projects that will do it.
I was considering extracting the Tek 2445/2465 code that does the
writing to create a special EEPROM. A user could place the 100 ER1400
words to be written in a known location, plug the EEPROM in the scope,
boot it, and it would write the block. This would be a way to restore
lost cal values from a previous EXER 02 dump, and the ER1400 could
stay soldered in the scope. However, ER1400 failures appear to be
rare, so this may not be worth the time investment compared to just
getting a re-cal. And an EEPROM programmer would still be needed. I
didn't get much further than identifying the routine that does the
write.
I continue to be hopeful I'll someday find some hidden code that
allows one to write the values from the screen, and knowing Tek it
would work on all the 24xx series, but no such luck yet.
-mark
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On Sun, Apr 24, 2022 at 06:36 PM, Greg Muir wrote:
Mark,
I can appreciate the conservative approach to dealing with this device given
the limited R/W cycles. There may be something that happens during a
calibration sequence in addition to the new changes that would be entered.
Aside from that it looks like you really have to jump through hoops to deal
with this device especially if the scope does not have the option 10.
Greg
