Electronics > Repair

HP 34401a DMM with leaking segments

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HighVoltage:
Really nice job!
Looking forward to your final design.

bitseeker:
I second what HV said.

Somewhere, I have some Noritake dot matrix VFDs. I think they're 40x2 or maybe 40x4; don't quite remember. If I find them, I'll have to see if they might fit on some of the HP devices I have (DMMs and power supplies). Although replacement isn't necessary now, eventually they might need them.

qu1ck:
All right, here it is. Behold: the secret feature unveiled :D

https://youtu.be/LWxOfaXVN3I

That's right. It's a 240 positions resolution, 20fps bar graph. Supports signed and unsigned measurements.
For high fps you have to switch to 4 digit mode. In 5 and 6 digit modes you get 2-3 fps. You can see fps counter in top right on the display.

Pic of an unsigned measurement:

wictor:
Nice work!

bitseeker:
I love it! :clap: Makes me want to buy another 34401A, but with a bad display, to upgrade it.

Next secret features: graph and histogram? ;D

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