Just rig up a variable DC PSU (battery and pot) and a series resistor. Keep your DVM across the resistor (because its internal resistance will affect the reading slightly) and adjust the pot for F.S.D. of the meter. Then just work out the current using ohms law from your DVM reading and the known series resistor.
Any meter drive circuit should work OK and will have more than enough output to drive the meters. Calibration is achieved by adjusting the input to the meter drive circuit.
Edit... or if your DVM is sensitive enough then just place it in series with the meter and resistor and read the current directly on the DVM
Any meter drive circuit should work OK and will have more than enough output to drive the meters. Calibration is achieved by adjusting the input to the meter drive circuit.
Edit... or if your DVM is sensitive enough then just place it in series with the meter and resistor and read the current directly on the DVM
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