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error corrections in network analyzers

Question asked by e4411a on Aug 31, 2009

I am trying to understand the way the corrected system performance is specified.

For Ex.

The raw directivity of the PNA-X in the 50 to 500MHz range is  24dB.

However the corrected performance is 48dB using the 85052B cal kit for the same range.

The load is rated at 46dB return loss for the 85052B cal kit.

Then the 24dB directivity measured could be between 22.055 and 26.5126dB .

How is this corrected directivity of 48dBachieved?

Could you post some notes or direct me to some literature that talk about the other error terms as well that are indicated in the corrected system performance and what they mean for a measurement?