Agilent Technologies E4417A - Page 161

C Measurement Uncertainty Analysis - Power Reference Level Test
C-140 E4416A/E4417A Power Meters Service Guide
with;
0.15 ppm of Reading + 0.01 ppm of Range per
o
C (temp coefficient Tcal ±5
o
C)
± 8.75 ppm of Reading + 0.55 ppm of Range
Therefore,
For V
0
and V
1
, two measurements are taken, so the uncertainty is equated to
the RSS of using two DMMs;
Voltage measurement Uncertainty
U (V
comp
)49.25 μV
U (V
o
)69.65 μV
U (V
1
)69.65 μV
UV
comp
()UV
ref
()
8.75 5×
1000000
---------------------
0.55 10×
1000000
-----------------------+± 49.25μV±== =
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