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Measurement Uncertainty Analysis – Power Reference Level Test
Measurement Introduction
B-6 Agilent E4416A/E4417A Service Guide
Consider the model below:
An estimate of the moduli of Pd and Ps are each less than a specified value. Ps and Pd
each lie within a circle of radius P. Assuming Pd and Ps have equal probability of
lying anywhere within the circle the standard uncertainty of Mismatch becomes
Ps is the reflection coefficient of the source, which is specified as less than 1.05.
The reference is designed to have a VSWR of less than 1.05.
Hence,
P
uMs()
maxP
s
maxP
d
⋅
2
--------------------------------------------
±=
VSWR 1.05<
VSWR 1.05<
Ps max()Pd max()
VSWR 1–
VSWR 1+
-----------------------------
1.05 1–
1.05 1+
---------------------- 0.0244== ==