Hello; We are using a PNA N5245A for an antenna range system for mmW measurements. We usually do segmented frequency sweep for our tests. We recently noticed that if we save the PNA calibration and state (*.csa), when we recall the calibration, the frequency offset table does not saves the segmented frequencies in for the primary frequencies. However, if the calibration was performed with a linear frequency sweep, the primary frequency list is saved and recalled as expected. Is this a bug in the firmware or is there a reason why the primary frequency list when the calibration is a segmented list, when recalled it just saves the highest frequency the internal source can produce (in our case, 50.2 GHz)?
Can you provide us with a .sta file? Also useful would be a screenshot of the Freq offset dialog box....both before and after the recall. While I do not know if this will help, you might want to to try 9.42.12 firmware or higher to see if that works any differently.
jvall, here are some pictures illustrating the issue. Picture "Freq offset table" is the actual state (the calibration and instrument state we want to save in a *.csa). After saving the .csa file, and then performing a recall, the frequency offset table for channel 1 looks like picture "Freq offset table after recall". However, if instead of doing a segmented sweep, we do a linear sweep ("Freq offset table linear sweep"), and save the PNA cal ans state in a *.csa file, and then recall it, the frequency offset table for channel 1 looks as expected (" Freq offset table linear sweep").
I have not tried upgrading the firmware since the unit currently is been used for a test, as soon as I get a chance I'll perform the upgrade and let you know.