Electronics > Metrology

121GW not passing calibration

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J-R:
AC current calibration setpoints and inputs:


uA switch and jack position
50uA range
5uA/50Hz
50uA/50Hz

500uA range
50uA/50Hz
500uA/50Hz
50uA/10kHz
500uA/10kHz


mA switch and jack position
5mA range
500uA/50Hz
5mA/50Hz

50mA range
5mA/50Hz
50mA/50Hz
5mA/10kHz
50mA/10kHz


A switch and jack position
500mA range
50mA/50Hz
500mA/50Hz

5A range
500mA/50Hz
5A/50Hz

10A range
1A/50Hz
10A/50Hz


Notes:
Interesting that the 10kHz calibration points are only done for certain ranges.
When performing the offset and gain steps at the 50Hz frequency you do get the countdown timer and etc., but not for 10kHz.
I sanity checked one 121GW and the only range I found that needed major help was 50mA @ 10kHz.  It was 50.7mA before and 50.0mA afterwards.
Given the frequencies involved, this calibration procedure is doable for a typical hobbyist with just a function generator, an audio amp and another DMM with more digits and calibration data...

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