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Possible upgrade - Agilent 34410A to 34411A

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coromonadalix:


Edit    sold the L4411A  and got an 34410a  with the populated debug port  (ic+ plug)     old fw 2.21 .... gonna do a normal upgrade and see the plug pinouts with the known schematic

coromonadalix:
Was hard to find a way to solder a thin wire on  the jtag connector to hold the cpu in reset  while reading the eeprom in SPI

Changed the 34410 occurrence to 34411     and it still complained   about the model version

attached is the original  non modded AT24C16  eeprom

if someone  has ideas  loll

The wp pin is tied to ground   maybe its a problem,  my programmer seem able to bypass this ??  i've tried some read an writes ... and seems to work ?

Or someone has an defective 34411a board ?

TheSteve:
You have to mod the eeprom and program the 34411A firmware.

coromonadalix:
While i have pmed TheSteve

Still no luck with info's given here or TheSteve info's

The Firmware updater seems to check something who's not related to the eeprom model found in it  ??

Tried many combinations  eeprom vs the fw  files, no avail,  the meter will request to have proper 34410 fw  .....

TheSteve did apparently manage to convert 2 meters,  no success for me

On the Keysight Connection Manager, even with the 34411 model put in the eeprom,  it will still identify as a 34410A

The populated debug port on my meter doesn't seems to react at all, checked many times against the schematic


I was maybe or surely too fast to upgrade my version 2.21 ???  :palm:  |O

coromonadalix:
the cpu reset is located on theses pads  (pictures attached)   i was not connected properly, i was on the jtag reset pin ...

One side is DCOM  digital ground / metal casing of the meter

I connected the pin 14 of the lm339  u902   to the ground via an 100 ohms resistor


Still no success,    the info is elsewhere  ... not in the eeprom it seems

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