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I just tried ungrounding the case by unsoldering the wire at the soldering lug and it made no difference. I'm not too concerned about it because measuring small caps isn't what I got it for. The problem is that on the lowest cap range the eye stays open without anything connected or a small cap regardless of the capacitance dial setting. I just noticed that if a put a large enough cap on the measuring terminals the eye will close. I think that since there is so little current flowing when 60 Hz is put thru a small cap that if the old wiring, switches, etc. is leaky the current gets lost. At 60Hz a 200 pf cap has an impedance of about 13 Mohm.
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