ELVIS II units - when the DMM leads are connected together with the unit set to read AC current, the unit displays 3.56 mA? Is this normal?
For the ELVIS II unit with the instrument launcher selected - using the DMM to measure AC current: when the leads are connected together, the display show 3.56 mA. Is this normal? Readings do not become accurate until above 10 mArms.
Hello,
Yes, this is normal. The AC modes in DMMs become nonlinear with very small input signals near the bottom end of their ranges. The result is a residual error reading. This is not an offset -- as you noted, the accuracy improves as you increase the input signal. While this threshold is not specified for ELVIS II, it should be around 2% of range (10 mArms in the 500 mArms range, as you observed). By comparison, that threshold is specified as 5% of range for myDAQ and 1% of range for the PXI-4072.
I hope this helps.
Charles Y.
National Instruments
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