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where,
P
is the reflection coefficient of the source (i.e. the DUT) and P
s
coefficient of the 8478B detector.
Hence,
Consider the measurement setup that exists in Figure B-1
P
is the total power output from the DUT. Of this power a proportion related to P
o
reflected back towards the source. The power subjected on the 432 would be:
But because a proportion of this total power related to Pd has been reflected Ps will
again cause a reflection giving:
So the total power incident or measured by the 432 Power meter is given by:
Note
Agilent E4416A/E4417A Service Guide
Measurement Uncertainty Analysis – Power Reference Level Test
(
P meas
f V comp V 1 V 0 R CF M s
=
POWER
REF
DUT
P
d
Figure B-1: Measurement Setup
P o 1 P d
⎛
(
±
P
1 P
o
2
P o 1 P d
–
⎛
⎛
⎞
⎠
In all cases P
is extremely small therefore P
d
)
,
,
,
,
,
P
S
8478B
2
–
⎞
⎠
2
)
P
s
d
2
⁄
(
±
)
1 P s P d
⎞
⎠
² terms tend to zero leaving.
d
Measurement Introduction
is the reflection
d
432A
Power
Meter
is
d
C-3
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