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4402serv.book Page 8 Tuesday, October 14, 2003 3:18 PM
Measurement Uncertainty Analysis – Instrument Accuracy Test
Measurement Introduction
By using the DMM Uncertainties calculated previously the worst case voltage and
corresponding power errors can be calculated.
Power Setting
(mW)
Applied Volts
DMM Error on
Range Standard
Uncertainty (uV)
Worst Case
Voltage Error on
Range (%)
Worst Case
Power Error on
Range
0.001
0.14493mV
<1.371uV
0.946%
0.00946uW
0.01
1.4493mV
<1.371uV
0.0946%
0.00946uW
0.1
14.493mV
1.371uV
0.00946%
0.00946uW
1
144.93mV
6.09uV
0.00420%
0.042uW
10
1.4588V
56.8uV
0.00389%
0.389uW
100
15.6V
148.8uV
0.00095%
0.95uW
Sensitivity Coefficients Ci:
The partial derivatives of the measurement equation Y = f(MV, TSE) equal 1.
TSE is derived from a number of readings taken by the test station to characterize the
cabling, connectors noise and so forth. Therefore no measurement equation exists to
differentiate. It is a measured value of magnitude.
Hence:
C TSE =
d
TSE = 1
d TSE
The DMM Measured Voltage also has a sensitivity coefficient equal to 1. As with the
TSE the Measured Voltage is not computed from an equation. Is it a real value that the
DMM actually measures.
Hence:
C MV =
A-8
d
MV = 1
d MV
Agilent E4416A/E4417A Service Guide