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Accurate Low Amp Current Probe Advice

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KungFuJosh:

--- Quote from: Martin72 on November 08, 2024, 09:43:44 pm ---A good result that I am tempted to reproduce.

--- End quote ---

I'd love to see how your AM503A compares!

For anybody with an AM503B that wants to recap or convert the NVRAM, this is my Mouser BOM of what I ordered.

So far I've upgraded the NVRAM and changed only the 4 large caps. I will probably do the rest of the caps on that list too.

Thanks,
Josh

KungFuJosh:

--- Quote from: MarkL on November 08, 2024, 09:38:40 pm ---So... If you're still using 10mA/div to be comparable with previous tests, that's a drift of 0.235mA.  Half of what I was getting.  Not bad!

--- End quote ---

Thanks! I'm happy with the result.

I'm curious now if replacing the rest of the electrolytic caps with lower ESR caps will change anything, and if so, for better or worse. 🤔

ETA: Mark, can you please confirm the values of your electrolytic caps in your AM503B? 4 caps were already replaced before I got mine.

Thanks,
Josh

Martin72:
Then, to be consistent, you would have to monitor the voltages that the electrolytic capacitors filter.
If these are/were unstable due to aging of the electrolytic capacitors, it will affect everything that is supplied by them.

KungFuJosh:

--- Quote from: Martin72 on November 08, 2024, 10:01:17 pm ---Then, to be consistent, you would have to monitor the voltages that the electrolytic capacitors filter.
If these are/were unstable due to aging of the electrolytic capacitors, it will affect everything that is supplied by them.

--- End quote ---

What will monitoring them help? I don't have a schematic or reference of any kind for the 503B. If I swap out a set of caps and test the performance of the probe, won't that tell me what I need to know?

I'll also be connecting all caps to the IM3570 to test ESR at 100kHz and µF at the proper range for the value. I tested some of them in circuit with the ST42, and it did pretty well too.

Martin72:

--- Quote ---If I swap out a set of caps and test the performance of the probe, won't that tell me what I need to know?

--- End quote ---

Of course you can do it that way...
I'm always interested in the background of such things, because even years ago I always had a problem in the test field.
Don't ask, just replace...
That was always not enough for me.
Forget what I said. ;)

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