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Accurate Low Amp Current Probe Advice

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nctnico:
Now I recall why I never bought that Tektronix current clamp...  8)

KungFuJosh:
Are you kidding? The custom FRAM chip update project looks fun! I'm getting my Mouser order ready now. 😉

It's already pretty close, but if a fun project and some tweaking gets it dead on, that's pretty cool. I'm not going to spend $5000 on a probe any time soon, so this is the best option.

I think the best reason to avoid this probe is the physical size of the current amp it connects to.

KungFuJosh:

--- Quote from: MarkL on November 04, 2024, 05:13:04 pm ---Fortunately, someone has reverse-engineered the contents of the NVRAM, and it's possible to just write the new cal values directly to the NVRAM:

--- End quote ---

Thanks! Do you know if they shared the spreadsheet shown in the PDF? I can't find it anywhere.

Thanks,
Josh

Martin72:

--- Quote from: nctnico on November 04, 2024, 05:42:02 pm ---Now I recall why I never bought that Tektronix current clamp...  8)

--- End quote ---

Because you have a functioning crystal ball. ;)
The battery of my 503A was dead too, but changing it was no problem because I had followed these instructions.

MarkL:

--- Quote from: KungFuJosh on November 04, 2024, 06:06:46 pm ---
--- Quote from: MarkL on November 04, 2024, 05:13:04 pm ---Fortunately, someone has reverse-engineered the contents of the NVRAM, and it's possible to just write the new cal values directly to the NVRAM:

--- End quote ---

Thanks! Do you know if they shared the spreadsheet shown in the PDF? I can't find it anywhere.

Thanks,
Josh

--- End quote ---
I haven't seen it anywhere.  However, the data in NVRAM is sparse and it looks to be only about 25 bytes.  It wouldn't take long to type it in if you're looking to copy their NVRAM.  Some of the values may already have been initialized to defaults if the battery was detected as dead.

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