D Measuremet Uncertainty Analysis - Instrument Accuracy Test
170 Keysight E4416A/E4417A Power Meters Service Guide
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:
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:
Combined Standard Uncertainty uc(y):
There is no correlation associated with this measurement
Hence:
Table D-3 shows the combined standard uncertainty at all the power levels from 3
μW (
−25 dBm) to 100 mW (20 dBm).
C
TSE
d
dTSE
---------- T S E 1==
uc
2
y() C
TSE
uTSE()
⋅
[]
2
∑
C
MV
uMV()
⋅
[]
2
,=
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