C Measurement Uncertainty Analysis - Power Reference Level Test
150 Keysight E4416A/E4417A Power Meters Service Guide
So the total power incident or measured by the Keysight 432 Power meter is given
by:
The equation above includes the worst-case mismatch magnitude 2P
s
P
d
and is in
the form where various powers can be multiplied by the equation to find
worst-case power levels with respect to mismatch.
In all cases P
d
is extremely small therefore P
d
²
terms tend to zero leaving.
M
s
Uncertainty 112P
s
P
d
±()⁄=
From the above mismatch uncertainty equation if Pd is zero, for example, the
8478B sensor is exactly 50 ohms then there is NO mismatch uncertainty. This
has not yet been achieved but efforts will be made in the future to try to achieve
as near as possible to a 'zero' level of mismatch uncertainty and hence have
negligible mismatch when calibrating products.
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