Sensitivity Coefficients (Ci - Agilent Technologies E4416A Service Manual

C Measurement Uncertainty Analysis - Power Reference Level Test

Sensitivity Coefficients (Ci)

I mW Power Measured = f(V
The sensitivity coefficients should be evaluated using the best estimate of
V , V
comp
are:
V = 4.857 V
comp
V = 83.12 mV V0= 96.17 V
1
1
R = 200
2
CF = 97.5%
= 0.975
The best guess for the Mismatch of the P
as shown earlier is:
M = P
s
This equation shows that if an infinite amount of readings of mismatch were
taken between P
Using the above values gives
Ci
V
comp
Ci =
V
1
Ci =
V
0
1 The resistance on the 432A Power meters is set to 200 Ω for this test
2 The average Calibration Factor from the previous six sensors on the Production Line
C-146
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, V
comp
, V , R, CF and M . The nominal values for V
1 0 s
( ± ( ⋅ ⋅ ) ) ) ≈
1 2 P P
out s d
P the mean value would equal 1.
s d
(
2 V
d
------------------ PM
= = --------------------------
dV
4RCFM
comp
2V –
d
comp
--------- PM
= --------------------------------- -
dV
4RCFM
1
– ( )V
2
d
comp
--------- PM
= ------------------------------------------
dV
4RCFM
0
, V , R, CF, M )
1 0 s
, V
comp
P is = 1. Output power of the source
s d
)
– V
V
4 –
1 0
×
---
= 2.129 10
Ω
s
2V
V
2 –
1
×
---
= 1.224 10
Ω
s
+ 2V
– 2
0
×
= – 1.245 10
s
E4416A/E4417A Power Meters Service Guide
, V , R, and CF
1 0
V
---
Ω