Electronics > Repair
HP 34401a DMM with leaking segments
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coromonadalix:
you can turn the display off thru some commands,  you can find the user manual easily

page 132
http://ecee.colorado.edu/~mathys/ecen1400/pdf/references/HP34401A_BenchtopMultimeter.pdf

DISPlay {OFF|ON} 
Turn the front-panel display off or on.
[Stored in volatile memory]


http://cna.mamk.fi/Public/Slabra/Agilent/Multimetro_Digital_34401A_Quick_Reference_Guide.pdf
qu1ck:
That will not cut filament power, it is not digitally controlled.
coromonadalix:
yep you're right  quick

@imo  do you want to save the remaining life of the vfd ??
iMo:
Sure, the filament is permanently on. The command (via remote or from the keypad) switches off all the segments (such it deloads the 2x18V anode voltage) only.

As a first step I want to decrease the power consumption by 4Watts :)

qu1ck:
If I recall correctly you can just pull 2 brown wires from the transformer that provide filament voltage from the power connector block that goes into main board. Isolate the pulled contacts and that's it.

Are you using some sort of GPIB to bluetooth converter?
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