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iMo:
FYI - I've spent a while messing with the new "SCALE" settings.
The GAIN and the OFFSET - the max number of digits to enter is 7 in many orders of magnitude (u,m,K,M,G), positive or negative.. Pretty handy..  :)

PS:

When the SCALE is ON, the display shows 7 digits (ie 9.999,954) and it prints out 8 digits via rs232 (ie. 9.999,9543).

BUT, It seems the new STDDEV (as well as the MIN-MAX/AVRG/P-P) calculation does not work when SCALE is ON..  >:(
r6502:
Hello all,

I just found this interesting thread, basically because I was searching for a possibility, to read calibration data from my 34401a.

I also had a look on the revisions of my device, and I got 03-01-01, so it must be really old firmware. Will it be possible, to update it with a newer release in general and will that be possible without loosing the calibration information? If calibration gets lost, can the calibration information be restored form the read EEPROM content? I must say, I did not read all posts in this thread.

Thanks - Guido
rhb:
Just saw this and want a marker.  Definitely going to study the full thread.  I love the 34401A.

Reg
Hydron:

--- Quote from: r6502 on July 28, 2023, 10:49:30 am ---Hello all,

I just found this interesting thread, basically because I was searching for a possibility, to read calibration data from my 34401a.

I also had a look on the revisions of my device, and I got 03-01-01, so it must be really old firmware. Will it be possible, to update it with a newer release in general and will that be possible without loosing the calibration information? If calibration gets lost, can the calibration information be restored form the read EEPROM content? I must say, I did not read all posts in this thread.

Thanks - Guido

--- End quote ---
I suspect that you are out of luck sorry - seems that later firmware will expect the updated display PCB even if you were able to put the newer FW onto the unit (see https://xdevs.com/doc/HP_Agilent_Keysight/34401A/fw/readme.txt.txt).
It may be possible to read back the cal (well, EEPROM including cal) data though if the same PEEK command works as in FW7+ (I think it was PEEK -1, but check previous posts to be sure). No guarantees though and at your own risk (I'd set cal to secure before trying).
coromonadalix:
yes there is a FW limit for the old unobtanium display  ...   

and normally  you would need to reprogram one ic on the mainboard, and i think the display mcu too


there is tech notes about that ...
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