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A multiple point measurement is superior to only checking the calibration at one point.
If a single point calibration is used then select a load that is near the full scale maximum of the meter.
When several loads are used then segment the full scale into two, five or ten.
If I were to check the calibration then I would put a voltage multimeter right across the load then use Ohm's law, I=V/R to calculate the actual current based on the measured voltage and the measured load resistance.
The tool I would use for the load is an adjustable carbon pile load. Here are some images of mine when I was testing the generator in my Jeep. Note that I have a really nice clamp on meter that would be perfect if I wanted to make this measurement.
If a single point calibration is used then select a load that is near the full scale maximum of the meter.
When several loads are used then segment the full scale into two, five or ten.
If I were to check the calibration then I would put a voltage multimeter right across the load then use Ohm's law, I=V/R to calculate the actual current based on the measured voltage and the measured load resistance.
The tool I would use for the load is an adjustable carbon pile load. Here are some images of mine when I was testing the generator in my Jeep. Note that I have a really nice clamp on meter that would be perfect if I wanted to make this measurement.
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