Re: HP 3403C True RMS Voltmeter display fault
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Hey everyone,
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I'll check whether or not the blob will melt. Both capacitors have this blob, although it is more pronunced on the dead one. Considering that we can now see inside the capacitor I think it's indeed solder. It was there when I got it, and the caps date code match the rest of the instrument.?
Is it wise to reuse the old one which is good, but looks justs as weird? I'll post a picture later when on lunch pause.
I have already mapped the original part numbers for the capacitors in the unit based on the manual, I need to check the actual reality of it. I'll post the sheet when I'm done. They're basically all still available new, albeit at a premium. Once again a costly order.
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After that I'll adjust the voltage again, and try to calibrate it. I do not own a trustable RF source yet as my Marconi 2018A is in repair aswell (and part of the order), but I do own an Adret 104A DC voltage standard which is good enough for decent DC calibration.
It's probably been one or two decades since this thing had someone try to calibrate it. I'm worried about the converter internal state. Testing it, it's of course not accurate but it's not widdly far from it. I've tested it up to about 20MHz. DC is particularly close.
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Cheers,
Arnaud.
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