Mismatch - Keysight Technologies E4417A Service Manual

Mismatch

The Mismatch uncertainty was previously determined as being:
M s Uncertainty magnitude
This is the worst-case uncertainty for mismatch and occurs when the incident
NOTE
and reflected waves are 180 degrees out of phase
Consider the model below:
An estimate of the moduli of P
P
d
of lying anywhere within the circle the standard uncertainty of Mismatch becomes
u M s
P
s
VSWR < 1.05
Keysight E4416A/E4417A Power Meters Service Guide
Measurement Uncertainty Analysis - Power Reference Level Test
(
P
each lie within a circle of radius P. Assuming P
maxP s maxP d ⋅
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
=
( ) ±
is the reflection coefficient of the source, which is specified as less than 1.05.
= 2P s P d
)
and P are each less than a specified value. P
d s
2
and P have equal probability
d s
C
and
s
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