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To reduce the guesswork, I have found it useful to do a rough calibration on my vintage Heathkit C3 condenser checker. On my unit, it takes about 15 to 20 uA to fully close the eye, while 1/2 closure is obtained with a leakage of around 7 ua and 1 ua just barely causes moment of the eye (on the paper & mica setting). The readings are almost 1000 times higher on the electrolytic setting.
I find that "close enough" for my vintage radio service work, but if I desire more detail a 0-500V supply and uA meter will provide it.
jr
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