Products > Test Equipment
HP / Agilent 34401A hidden menu
Hydron:
--- Quote from: imo on January 11, 2023, 10:11:19 am ---Great work guys! While reading about your findings I've been pretty tempted to enable the functions in my meter, but still extremely cautious not to brick it or de-calibrate :)
--- End quote ---
The instructions below should work with all firmware after 07-xx-yy (confirmed on 07, 10 and 11):
--- Quote from: razvan784 on December 03, 2022, 12:43:19 pm ---In version 10 (and maybe others) there are dedicated POKEs that enable the hidden functions:
POKE 28,0,1191 math menu -> min-max: enable sdev, pp
POKE 30,0,1191 temp menu, scpi commands
POKE 31,0,1191 menu -> scale, calc:scale
POKE 32,0,1191 resolution menu -> custom aperture
POKE 33,0,1191 system menu -> store state, recall state
To disable, poke with something other than 1191, e.g. 0
To check if a function is enabled, use
PEEK -10,index,0 where index is
1 sdev, pp
2 temp
3 scale
4 custom aperture
5 save recall
--- End quote ---
If you are concerned about calibration data, then this can be backed up without opening the unit by using the PEEK -1 command: https://www.eevblog.com/forum/testgear/hp-agilent-34401a-hidden-menu/msg4436983/#msg4436983
Note that if you do corrupt it (should be very unlikely if you stick to the known safe POKE commands) then flashing it back would require opening the unit and flashing the EEPROM.
J-R:
I just enabled all these on my unit with revision 10-05-02. No issues. Being able to set the power-on state is particularly a nice feature to have.
iMo:
I started small and added the store state/recall state menus only, and it works!
It starts now with my config, except my lovely SYS/DISPLAY OFF setting which starts always on, it seems (I run the meter with display off all the time)..
dreamcat4:
have been watching with interest. but the problem i have here is....
i have early revision hardware. my firmware version is rev 06-04-01 so maybe that is too old?
coromonadalix:
--- Quote from: dreamcat4 on January 13, 2023, 10:00:49 am ---have been watching with interest. but the problem i have here is....
i have early revision hardware. my firmware version is rev 06-04-01 so maybe that is too old?
--- End quote ---
And you may have to old unobtanium vfd display driver ic ???
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