Agilent Technologies E4418B, Service Manual

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Measurement Uncertainty Analysis – Instrument Accuracy Test
Measurement Introduction
Agilent E4416A/E4417A Service Guide A-9
Combined Standard Uncertainty u
c
(y):
There is no correlation associated with this measurement
Hence:
Table A-3 shows the combined standard uncertainty at all the power levels from 3uW
(-25dBm) to 100mW (20dBm).
Table A-3: Combined Standard Uncertainty.
Expanded Uncertainty ku
c
(y):
The Expanded Uncertainty for each power level is given in the table above, using
Agilent Technologies’s standard 95% confidence level gives a coverage factor of 2.
Power
U
(TSE)
U
(MV)
(Converted)
uc(y)
k uc(y)
k=2
3.16uW 0.0097uW 0.00946uW 0.0135uW 0.0271uW
10uW 0.009uW 0.00946uW 0.0131uW 0.0262uW
31.6uW 0.0095uW 0.00946uW 0.0134uW 0.0268uW
100uW 0.035uW 0.00946uW 0.0363uW 0.0725uW
316uW 0.03uW 0.042uW 0.0516uW 0.1032uW
1mW 0.00007mW 0.000042mW 0.000082mW 0.00016mW
3.16mW 0.00022mW 0.000389mW 0.000447mW 0.00089mW
10mW 0.00069mW 0.000389mW 0.000792mW 0.00158mW
31.6mW 0.0022mW 0.00095mW 0.00239mW 0.00479mW
100mW 0.0092mW 0.00095mW 0.00924mW 0.01850mW
uc
2
y
( )
C
TSE
u TSE
( )
⋅
[ ]
2 ∑
cMV u MV
( )
⋅
[ ]
2 ,
=
K = 2
4402serv.book Page 9 Tuesday, October 14, 2003 3:18 PM