Products > Test Equipment
HP / Agilent 34401A hidden menu
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meandeev:
You cannot put/hold cpu in reset with GPIB adapter or serial port.

I used 2 mini grabbers connected with an 1k resistor.
Take a look at the picture in https://www.eevblog.com/forum/metrology/read-and-restore-calibration-constants-from-a-hp-34401a/msg1743833/#msg1743833
there you can see which cpu pins have to be connected to hold it in reset mode.
dimmog:
Just found a YouTube video that proves the "TEMP MENU" exists in the real instrument!

https://youtu.be/lOqVhv5Ca08?t=49




meandeev:
I was able to decompile the cal-message, here you can find my result of the gambling with bits and bytes ~2 years ago. I put it in something that looks roughly like a C program-file.
But it´s rather useless, because it fits only the 05-01-01 firmware and without the crc-routine one cannot change anything without an error.

Thats why I suggested to decompile the firmware ROM.
meandeev:
 :-//
No compressor, I used yesterday a fresh downloaded Version of Pelles-C, compiled it with full debugging Info.
But you can compile it by yourself, source code is included.

My local Windows defender is fine, Virustotal says 4/68 detected  :o
coromonadalix:
doesnt want to run on my win 10 too   even defender disabled ???

 
Im gonna take the 34401a  who served as a guinea pig  for the  34401a  oled display variant thread,    but t will take a few days to test the poke command and grab the changes int the eeprom ... i do lots of overtime :( 

Dmm has the 07 05 02 fw too
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