Table of Contents
Advertisement
Measurement Uncertainty Analysis – Power Reference Level Test
Measurement Introduc tion
Combined Standard Uncertainty (
Source of
Symbol
Uncertainty
U(V
)
Two Voltage
0
measurements on a
3458A DMM
U(V
)
Two Voltage
1
measurements on a
3458A DMM
U(V
)
Voltage measurement
comp
on 3458A DMM
U(R)
4 wire Resistance
measurement on
3458A DMM
U(CF)
Calibration factor for
Thermistor
U(M
)
Mismatch between the
s
DUT and the
Thermistor
U(Drift)
Drift of 8478B
Thermistor
U(Rep)
Repeatability of the
complete measurement
Uc
Combined Uncertainty
1
U
Expanded Uncertainty
1 Using Agilent's standard 95.5% confidence the coverage factor is k = 2.00
Expanded Uncertainty
The expanded uncertainty is:
C-12
Table B-2: Combined Standard Uncertainty
Probability
Value
Distribution
69.65 µV
Normal
69.45 µV
Normal
49.25 µV
Normal
0.0046 Ω
Normal
0.002
Normal
0.0012
U shaped
0.0006
Normal
0.057 µW
Normal
Normal
k=2
Normal
U= 3.030 µ
c(y))
u
Divisor
Ci
-04
2
2.129x10
-02
2
1.224x10
2
-1.245x10
2
-4.727x10
2
-9.696x10
√2
-9.454x10
-03
2
1.00x10
1
1
W
, as a percent of 1.000 mW: U = 0.303%
Agilent E4416A/E4417A Service Guide
Ui
/µW
V/Ω
0.007
V/Ω
0.426
-02
V/Ω
0.307
-06
W/Ω
0.012
-04
W
1.070
-04
W
0.885
W
0.6
0.057
1.515
3.030
Advertisement
Table of Contents
