I've borrowed access to a PNA-X, and are trying to recall a .s1p file collected up to 11 GHz on a previous occasion. The stop frequency has been set to 11 GHz. I want to put a marker at 11 GHz, which is barely visible on the screen, so I thought I'd increase the stop frequency a bit to 12 GHz. It says at the top "Stop Frequency 12.0000 GHz", but the actual display shows a stop frequency of 11 GHz.
It's not unusual when plotting a graph of any sort (not just on a VNA) to set a scale over a slightly wider range than the data If one had data covering 0.1 to 9.9 volts on the x-axis ,one would generally draw the graph over the range 0-10 V, even though the data is over a slightly smaller range.
On the y-axis of the PNA-X, it is possible to set magnitudes and phases that far exceed the range in the Touchstone file, but not on the x-axis. Am I missing something, or is this some limitation in the firmware?