Keysight Technologies E4417A User Manual

C Measurement Uncertainty Analysis - Power Reference Level Test
158 Keysight E4416A/E4417A Power Meters Service Guide
Sensitivity Coefficients (Ci)
I mW Power Measured = f(V
comp
, V
1
, V
0
, R, CF, M
s
)
The sensitivity coefficients should be evaluated using the best estimate of
V
comp
, V
1
, V
0
, R, CF and M
s
. The nominal values for V
comp
, V
1
, V
0
, R, and CF are:
V
comp
= 4.857 V
V
1
= 83.12 mV V0= 96.17 V
R
[1]
= 200
CF
[2]
= 97.5%
= 0.975
The best guess for the Mismatch of the P
s
P
d
is = 1. Output power of the source as
shown earlier is:
This equation shows that if an infinite amount of readings of mismatch were taken
between P
s
P
d
the mean value would equal 1.
Using the above values gives
[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
M
s
P
out
12P
s
P
d
⋅⋅()±()=()1≈
Ci
V
comp
d
dV
comp
--------------- --
PM
2 V
1
V
0
–()
4RCFM
s
------------------ ---
2.129 10
4–
V
Ω
---×===
Ci
V
1
d
dV
1
--------
PM
2V
comp
2V
1
–
4RCFM
s
--------------- ---------------
1.224 10
2–
V
Ω
---×== =
Ci
V
0
d
dV
0
--------
PM
2–()V
comp
2V
0
+
4RCFM
s
--------------- ---------------------
1.245– 10
2–
V
Ω
---×== =

Keysight Technologies E4417A Specifications

General

Brand	Keysight Technologies
Model	E4417A
Category	Measuring Instruments
Language	English