I have fiche? -90021 dated September 1975 as being for serials starting 1528A
This does not seem to chime with your earliest version but the may be because my dates are fiche release dates and the underlying paper manual may be dated differently
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I also have something marked Electronic Counters and Plugins Users Handbook (Sept 1974 and March 1986 rev 1) 05345-90015 that may contain additional circuit operation details
Also option 011 Operating note? 05345-90011
And GPIB interface supplement? 05345-90022
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- If you send me a link to your 90025 manual then I will compare to my earlier one to see if there are any differences
- I will take a look at the handbook and see if there is anything helpful there
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