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ch_scr:
Maybe dump the rom before and after enabeling the 10mA range as described here: https://www.keysight.com/main/editorial.jspx?cc=DE&lc=ger&ckey=1000001267:epsg:faq&nid=-31895.536880933.02&id=1000001267:epsg:faq
to shed some light on the poke command?
It might als point to the general area where such option bits are stored.

edit:
@meandeev:
Can you elaborate in what formate the cal string is stored, when looking at dimmog's dump there do not appear to be ASCII chars after 0x22  :-//

edit #2:
It appears to be "Packed 7bit ascii" but the offsets might vary with FW version?
I can find:
"HP034401" starting at 0x64
"EQUIP.NET" 0x72

A lot different from the dump i found on xDevs.
"HP9000" (might be coincidence) 0x18
"CAL: 35.7C; 3 Mar" 0x26
".7C; 3 Mar 1992;09" 0x2D
"ar 1992;09:33:58" 0x34
"09:33:58" 0x3B
coromonadalix:
the 10ma range should be stored in the eeprom ??

Im not at home ..   with this command,  is it stored until you disable it thru the other command, does it stay permanently ???

Damn   i'm intrigued by the temp measurements menu loll
ch_scr:
They make it seem like the only way to remove the 10 mA range is to send the second command, and the eeprom is the logical place to store it.
Can you check what cal info string is shown on the device?

You could go crazy with some poke 24,0,1  23 or 26,27 and just see what happens BECAUSE YOU HAVE A BACKUP. DO NOT DO THIS WITHOUT CAL BACKUP. CAL MEMORY CORRUPTION IS LIKELY.

But doing just the one poke to show what bit is flipped (and IF a bit is flipped...) in the dump might shine some light.
Also storing a setting (then dump) and then changing one part of that setting and store it again (dump again) should point to the memory are where settings are stored.
And IF the state settings are stored in the eeprom at all...

edit: In the service manual the "Cal eeprom" is the only place I can find information can be stored in a persistent way by the device itself. Let's see if 10mA and state settings turn up?
razvan784:
I firmly support the above advice to not go poking around without first backing up the EEPROM. That's where the calibration info is stored, because it is the only writeable memory in the device (check the schematic!).
Not only is standard cal data stored there, but also special factory cal data that cannot be restored by going through the usual cal procedure, such as the PWM DAC setting for the input switch precharge amp.
These can be altered through undocumented POKE commands, and some PEEK commands might have side effects as well.
coromonadalix:
Gonna rig something up, i have a pomona soic 8 socket,  just need to make place on my bench loll   

Need to make something to put the cpu in reset while making a eeprom dump, i dont have gpib adapters. 

Should work in serial terminal ?

I have an elnec programmer
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