©Fluke Calibration 2011 Basics Of Measurement Uncertainty for DMM Calibration 43
Calculating u
2
•The value of u
2
is the ±1 sigma calibrator spec:
5500A – 1 year specs @10 A, 50 Hz
This u
2
value should be smaller than the published spec!
With a spec of ±8 mA at 99% confidence
divide by 2.58 to convert to a ±1 sigma spec
u
2
= 8 mA / 2.58 mA = 3.1 mA at ±1 std. dev.
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