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How could I remove switching errors in the N9918A VNA?

Question asked by N9928A_User on Jul 2, 2017
Latest reply on Jul 11, 2017 by am95405

I want to remove the effect of non-ideal switching effect from measurements. The following article discusses one simple technique to do this:

 

R. B. Marks, “Formulation of the basic vector network analyzer error model including switch terms,” in Proc. 50th ARFTG Conf., 1997, pp. 115-126.

 

However, the technique proposed relies on measured wave amplitudes of returned waves from the non-ideal Z0. For example, a3.

 

Now the question is. Is the N9918A VNA a three-sampler system or four-sampler system?? I do not get an answer to this from the manual of this VNA.

 

Thanks,

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