
Transmission
Uncertainty
Transmission phase uncertainty is calculated from a comparison of the magnitude uncertainty
with the test signal magnitude. The worst case phase
is computed. This
is
combined with the error terms related to phase dynamic accuracy, cable phase stability, and
thermal drift of the total system.
+ Cpfl
x f +
x f + Dps1 + Dpfsl x f
where
Cpfl = Cable phase/frequency port 1
= Cable phase/frequency port 2
Dpsl drift phase/degree source to port 1
Dpfsl = drift phase/degree/frequency source to port 1
Dynamic Accuracy
On the following page is a typical dynamic accuracy and noise curve for the analyzer. This
curve is based on statistical samples of units
at the factory with an IF BW of 10 Hz.
Since this curve combines the effects of dynamic accuracy and noise, if used in uncertainty
calculations, the effects of the noise terms in the corresponding equations can be eliminated.
Dynamic Accuracy (linear) =
10
1
Dynamic Accuracy
1
Dynamic Accuracy (linear))
Magnitude Dynamic Accuracy 0.3 to 3000 MHz
Magnitude Dynamic Accuracy 3-6
0
-10 -20 -30 -40 -50 -60 -70 -80 -90 -100
Test Port Power
Test Port Power
Determining System Measurement Uncertainties
Содержание HP 8753E
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