Fluke Digital Multimeter - Page 31

©Fluke Calibration 2011 Basics Of Measurement Uncertainty for DMM Calibration 31
Measurement
Value
1
10.07
2
10.02
3
10.01
4
10.06
5
10.04
Average
10.04
Measured value: the average
of a series of measurements
AIavg 04.10
• An average of multiple measurements is
a better estimate of the true value than
any individual value
• As a rule of thumb, taking between 4 &
10 measurements are sufficient.
• Uncertainty improvements for more than
10 have diminishing results
• In our example, 5 readings are
sufficient. Any improved uncertainties
for more readings are not significant
versus required measurement
tolerances (a typical DMM specification
for this example test is ~ ±2.5%).