On this subject, some one said that you can't get a pass result when the analyzer is in overload.
Surely, this is true ONLY when the signal causing the overload is generated by the device under test? What ff the signal is an environmental signal? It could be in the pass-band of the analyzer front end (no pre-selector) but not in the frequency range of the measurement. If it is not measured how do you know it is there? However, could it cause gain compression within the anayzer or (maybe) spurious mixing products? I am planning on buying the HP analyzer plus the HP 11960A preselector. If I need to (and taking the necessary precautions) I plan to put a pre-amplifier between the preselector and the analyzer. On the subject of filter shapes, is possible to measure the impulse bandwidth of the analyzer and calculate a compensation figure? I realise that this might not produce an identical result in all cases, but would it serve for most purposes? I suppose all that is needed is a calibrated broadband signal source. I remember that a firm called Solar used to make one. Are they still a going concern? I'm not sure if there is anyone else that makes them. Tim Haynes My mind is my own, blame no other for my thoughts.
