scope frequency readout

[m3vuv]

Hi all ive a hp 54503a 500mhz scope,when trying to measure the output of my nanovna the readings i get are all low for the frequency when using the time markers on the peak to peak of the displayed waveform,as fas as i know the nanovna works using the harmonics of the frequency its set at,is there a way to display the same frequency on the scope that the vna is set to output and not the fundamental frequency as it seems to do at the moment?.tia.