Electronics > Projects, Designs, and Technical Stuff

Fluke 731B Voltage Standard Restoration and Mods?

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Conrad Hoffman:
When that's done, put it in a cardboard box or picnic cooler with a small light bulb and see how far it moves with temperature. Might be great, might be awful, but then you'll know.

TERRA Operative:
I'll give that a go, would be interesting to try to see what happens at different temperatures.



Below are screenshots for each range setting (Some are reposts of previous images).
They all look pretty good except some weirdness on the 1V range. Anyone got any ideas what went there? It was done in a room between around 22.5 - 23.5 degrees, so it shouldn't be too much of an issue with temperature drift.
I noticed a handwritten note on the schematic saying that if there is "T.C problems only on 1v range, change R20 - R23", which is listed as a resistor set, part number 391417. I'm hoping they aren't the problem...

Let me know if you have any ideas.....

iMo:
Off the 1V histogram it seems it jumps ~2.5uV between two values almost 1:1. Bad contact?

TERRA Operative:
That's what I am thinking.
Maybe I bumped it and the leads got wiggled a bit. I have applied deoxit and cleaned everything up, reseated the cables and now I'm running another test overnight with the aircon set to 23 degrees as specified in the manual.

If it comes good, I think maybe the leads weren't pushed all the way in and got bumped.

iMo:
Trimmers (!) and sockets and connectors are not good for a "metrological" gadget. Too many there in the box, though..

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