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Old 02-04-2017, 04:04 PM
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Quote:
Originally Posted by jr_tech View Post
The Heathkit C-3 just uses 60 Hz from a 55 Volt winding on the transformer... reads down to 10 mmf.

jr
Interesting - I believe you, but still hard to -

Reactance of 10mmf (10pf) at 60 Hz = 265 Megohm
Maximum current at 55 volts is 0.2 microamps

Reactance goes down to 16 Megohm at 1 Khz, still a pretty big number
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