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HP / Agilent 34401A hidden menu

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iMo:

--- Quote from: Hydron on January 13, 2023, 12:45:23 pm ---7 digits with scale. Also you can use the custom aperture to get faster 6-digit readings than otherwise possible.

Edit: to clarify, you get 7 digits (no overrange though, so 9,999,999 count max) on both the output and the coefficients

--- End quote ---

The question is how you would enter those two coefficients into the meter.. How many significant digits of the "gain" and the "offset" you can enter into..
For example in my above example with 7digits, the required 0,999.994.67 would be entered as "0,999.995" (and it is not precise enough for 1uV resolution, even though it is an extreme example when talking 34401A..).

Hydron:
Sounds like you might be expecting a little much from an unofficial feature of a 30 year old 6.5 digit meter!
Won't hurt to enable it and see how you go though. Note that the first digit out of the 7 can be a 9 and you can move the decimal point (i.e. if you think of it as a base-10 float, the 7 digits is the mantissa, and you can change the exponent)

dreamcat4:
can i do all this peeking and poking over the rs232 serial port. or is this gpib only?

Hydron:
RS232 is fine, but I wouldn't do anything other than PEEK without confirmation that FW v6 can enable the extra features - looks like v5 doesn't have them, v7+ does, see post here: https://www.eevblog.com/forum/testgear/hp-agilent-34401a-hidden-menu/msg3228980/#msg3228980
Unfortunately xdevs doesn't have a copy of FW 06-xx-yy to check - if the ROM read commands from this post work then you might be able to dump it to check (and add to the xdevs collection) though: https://www.eevblog.com/forum/testgear/hp-agilent-34401a-hidden-menu/msg4562218/#msg4562218

iMo:
Btw. - would be great to write a small piece of code or a small script for reading out all rom/flash content of the meter in a safe manner..
A no-brainer which will spit out the hex in a standard format without creating a risk, a quick Sunday's afternoon exercise for the experts here - the noobs like me would be thankful..  ;)

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