Can someone describe the impact of the H4 clock rate on a measurement?
An example: I do an S21 test on a 20db attenuator sweeping 401 points from 1 to 900 MHz (the VNA calibrated across this range). The LOGMAG display shows a completely flat response, 20db across the whole range. The Smith chart shows a tiny amount of inductive reactance that increases (tho still very small) as the frequency goes up.
How does the loss of dynamic range impact my measurement at frequencies above 300 MHz? Is the display, what I see on the screen, less "trustworthy" over 300MHz? Should I interpret the LOGMAG and Smith reports differently below and above 300MHz?
What is the practical outcome of the dynamic range restriction on my test?
