HP 8753E manual Reflection Phase Uncertainty Erp

Models: 8753E

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where

w Efnt = effective noise on trace w Efnf = effective noise floor

nCrtl = connector repeatability (transmission)

nCrrl = connector repeatability (reflection)

nCtml = cable 1 transmission magnitude stability

nCrml = cable 1 reflection magnitude stability

w Cm12 = cable 2 reflection magnitude stability

nDmsl = drift magnitude/°C source to port 1

nEfs = effective source match error

nEfr = effective reflection tracking error

nEfl = effective load match error

nEfd = effective directivity error

nCrr2 = Connector repeatability (reflection)

The detailed equation for each of the previous terms is derived from the signal flow model, located at the end of this appendix.

Reflection Phase Uncertainty (Erp)

Reflection phase uncertainty is determined 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 thermal drift of the total system, port 1 cable stability, and phase dynamic accuracy.

+2Cpfl x f + Dpsl + Dpfsl x f

where

Cpfl = cable phase/frequency port 1

Dpsl = drift phase/degree source to port 1

Dpfsl = drift phase/degree/frequency source to port 1

84 Determining System Measurement Uncertainties

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HP 8753E manual Reflection Phase Uncertainty Erp