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Measurement Uncertainty Analysis – Power Reference Level Test
Measurement Introduction
B-10 Agilent E4416A/E4417A Service Guide
The readings in Table B-1 are in milli-Watts, therefore the Standard Deviation (worse
case) is: - U (Rep) = 0.057 µWatts
Sensitivity Coefficients (Ci)
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
1. The resistance on the 432A Power meters is set to 200ohms for this test
2. The average Calibration Factor from the previous six sensors on the Production Line
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.
Min 0.999406 0.999377721
Average 0.999529 0.999504053
SD 5.67E-05 5.01868E-05
1. Measurement 5 was discounted from the calculations as being an extraneous
measurement.
V
comp
= 4.857 V
V
1
= 83.12 mV
V
0
= 96.17 µV
R
1
= 200 Ω
CF
2
= 97.5%
= 0.975
Table B-1: Measurement Repeatability Results
Measurement ADJUST REF. REF. LEVEL TEST
I mW Power Measured = f(V
comp
, V
1
, V
0
, R, CF, M
s
)
M
s
P
out
1 2P
s
P
d
⋅⋅
()±()1≈=