Calibration Factor - Agilent Technologies E4416A Service Manual

C Measurement Uncertainty Analysis - Power Reference Level Test
The reference is designed to have a VSWR of less than 1.05.
VSWR < 1.05
Hence,
(
P max
s
So u(M
( )
u M
s
Mismatch Uncertainty U(M
UM
s

Calibration factor

The calibration factors supplied with the power sensor take into account the
performance of the sensor with respect to frequency. This value is of
secondary importance when calculating the overall uncertainty of the 1 mW
reference.
The information that is appropriate is the Uncertainty of the Calibration
Factor. The power sensor must be calibrated such that:
Uncertainty of Calibration Factor < 0.2%
Therefore,
U(CF) = 0.002
C-142
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VSWR 1
) ( )
= P max = -------------------------
d
VSWR
) from the equation above equals:
s
( ) × ( )
0.0244 0.0244
±
------------------------------------------------- -
=
2
) worst case:
s
× (
= 2P P = 2 2 u M
s d s
– 1.05 1 –
= ------------------- = 0.0244
+ 1 1.05 + 1
= 0.00042
)
= 0.0012
E4416A/E4417A Power Meters Service Guide