Electronics > Repair
HP 34401a DMM with leaking segments
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iMo:
I've been using rs232 to HC-05. Powered from the meter.
coromonadalix:
You could use an i/o line to switch of your vfd

You have pio2 thru 11 to play with ...

https://www.rhydolabz.com/documents/HC-05_datasheet.pdf

the command at page 11 section 17  should give you what you need

https://www.rhydolabz.com/documents/HC-05%20AT%20Commamd.pdf

just add you on / off circuit on pio line   Ie : an small npn transistor with an small 5v relay ??
iMo:
I plan to use an MCU put inside the meter for such tasks..
The HC-05 will stay outside the box.

PS: the toggling with PIO pins works in AT mode only, afaik.
I've been using it as a dumb serial device passing bytes at 9k6 8N2 to/from the meter.
coromonadalix:
The 34401 can constantly output  " talk only "    if you set it to adress 31 and select gpib or rs232 output ??


From Keysight

In the "talk only" mode, the Agilent 34401A automatically sends readings directly to the GP-IB or RS-232 port. To enable the "talk only" mode, first set the HP-IB address to "31" using the front-panel I/O Menu. Then, select either the GP-IB or RS-232 interface (also in the I/O Menu)
iMo:
Yes it can do via rs232 with the 31 address. It sends out strings (scientific floating point, like "+9.99995790E+00") with results.
For example you may read the rs232 strings with an external MCU and display them on any display you wish then..

PS: the filament changes its resistance when ON, imho. So the current will be smaller after the filament heats up..
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