Agilent Technologies E4416A Service Manual page 158

CF is the value of the Calibration Factor of the Thermistor mount at 50 MHz.
M is the mismatch magnitude between the DUT reference and the 8478B
s
sensor, which is equal to:
M = 2
s
where,
P is the reflection coefficient of the source (i.e. the DUT) and P
s
reflection coefficient of the 8478B detector.
Hence,
=
meas
Consider the measurement setup that exists in
F i g u r e C - 1
P is the total power output from the DUT. Of this power a proportion related
o
to P is reflected back towards the source. The power subjected on the Agilent
d
432 would be:
(
P 1 P –
o
But because a proportion of this total power related to P
Ps will again cause a reflection giving:
( ±
P 1 P
o
E4416A/E4417A Power Meters Service Guide
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Measurement Uncertainty Analysis - Power Reference Level Test
⋅ ⋅
P P
s d
( , , , ,
f V V V R CF M
comp 1 0
P
s
8478B
DUT
P
d
M e a s u r e m e n t S e t u p
2
)
d
2
)
P
s d
,
s
Table C- 1
432A
Power Meter
has been reflected
d
C
is the
d
C-137