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RE: My meter is scaled to 200 ma.

Is this a panel meter you're discussing? If so, I would expect a 200mA meter not to need an external shunt. The only way to be certain is to rig up a variable power supply and fixed resistor for a test. For example, connect a 100 ohm resistor in series with the meter, then slowly begin applying voltage. If the needle goes to full scale quickly, it needs a shunt. Otherwise, it should read half scale (100mA) when you reach 10V.

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