Hello!
I would like to ask you about the HP8555A problem as follows: when applying the calibrator signal (30 MHz, - 30 dBm) of the HP 8552B IF plugin to the HP8555A plugin main input, I can see the signal spectrum not only in corresponding frequency range (0-2 GHz), but also in some upper ranges. Similarly, when using external signal with the frequency around 9 GHz, I can see the signal not only in correponding range (6.2-14 GHz), but also in some lower ranges. When switching through ranges, the signal varies slightly as in amplitude as in screen position. My best guess is that for ranges outside signal spectrum there should be no signal detection... Could you, please, help?
Thank You!