Agilent Technologies E4416A Service Manual page 161

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