HP 8753E User Manual page 667

Transmission Phase Uncertainty (Etp)
Transmission phase uncertainty is calculated from a comparison of the magnitude uncertainty
with the test signal magnitude. The worst case phase angle is computed. This result is
combined with the error terms related to phase dynamic accuracy, cable phase stability, and
thermal drift of the total system.
where
Cpfl = Cable phase/frequency port 1
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 built 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 (dB) = 2OZog(
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100
Test Port Power (dBm)
Determining System Measurement Uncertainties
+ Cpfl x f + Cpf2 x f + Dps1 + Dpfsl x f
Dynamic Accuracy (linear) =
10
1
Test Port Power (&III)