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I made up an AC probe and it seems to be working, but I can't quite red the meter to zero on the AC ranges. It's especially bad at the lower ranges.
I've tried adjusting both the front panel AC Zero knob and the internal trimmer. I have them both at their extremes and it's not quite enough. I checked the associated resistors and replaced a 15K that had drifted a bit and it didn't help.
I'll keep digging...
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