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Measurement Uncertainty

Question asked by josh on Feb 17, 2013
Latest reply on May 15, 2013 by kenwong
Can anyone shed some light on the measurement uncertainty specifications for a HP8753D Network analyser;

Last month our company rented a HP8753D Network analyser complete with HP85032B calibration kit to measure the reflection parameter performance of our product.
When looking at the performance specifications for this analyser (using the specified cal kit with N type connections) the reflection measurement uncertainty is stated as 0.02 for S11 magnitude = 1.
This is copied from the technical specifications manual page 4, and  circled in red in the attached file.

This seems be a very large uncertainty, particularly in terms of impedance:
S11=0.999 equates to 100k Ohms
S11=0.979 equates to 4k7 Ohms
This 0.02 S11 magnitude uncertainty equates to a 96% uncertainty in impedance?

In practice of course, both are measured very accurately by this unit.

Have we interpreted these specifications wrongly?
Any help is appreciated.
Thanks in advance,