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VNA TDR and fringing capacitance of the open

Question asked by SOLT_guy on Jul 11, 2009
Latest reply on Jul 14, 2009 by SOLT_guy
VNAs are not dedicated TDR test instruments.

Therefore, it is assumed the ability of a VNA with TDR options installed is somewhat limited in its ability to alter the rise and fall time of a stimulus signal.   Please assert whether this assumption is correct or incorrect. 

The question I am posing is with respect to a VNA's TDR response time. 

If the VNA is limited in its ability to alter its stimulus signal rise time and fall time, when characterizing the response time of an open standard,  can the fringing capacitance of the open standard affect the TDR response time - resulting in a slightly longer response time?

Also, how does the VNA TDR "short" standard response time compare with the open response time, assume a zero offset delay for both the short and open.