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In Reply to: RE: My meter is scaled to 200 ma. posted by Chip647 on June 20, 2017 at 08:06:10
"Most labeled "mA" that have a low scale (500mA or less) are 200mV DC meters without an internal shunt."
If I understand, you're saying the meters are mostly 0.2V FS, and it's the difference in coil resistance that provides different FS current readings. That would mean a 200mA DC panel meter is likely to have a coil resistance of one ohm. Is that correct?
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Follow Ups:
Most old panel meters need an external resistor network to function correctly. My advice is to test it carefully before putting it in a circuit and destroying it. But yes, if the coil resistance is 1 ohm then it could be used directly as a low current ammeter.
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