So a pad between the SA input and antenna/signal source? How much attenuation? /inquiring mind
In an ideal world the SA manufacturer will specify the "maximum [usable] input", but you should confirm it isn't 'maximum input,
no damage", which means the front end could still be saturating, it's just that no damage will occur. All the credible manufacturers (Keysight, Anritsu, Rigol, R&S, Sigent, Signal Hound, TTI, etc.) specify max input as that which is usable, but it's generally for a CW or narrow band digital signal, not wide band digital such as digital wireless mics/IEM's. For digital mics, add 10dB to the rated RF output to be safe when determining if SA input can properly handle the power*.
If unsure, always begin with a 20dB, even 30dB, attenuator between the LPAS device and the SA input until you can see the waveform and signal level vs. scale. FWIW, I generally use attenuators in multiples of 10 in this application just to keep the math simple.
*So now the obvious question is how does one determine the actual RF power output of a wide band digital device. One has to look at
channelized power; that power contained within the defined channel bandwidth of the carrier. Thus, as an example, for an Axient Digital mic, the defined channel bandwidth is 185kHz, and, if your SA has a channel power function, you would set the channel power width to the 185kHz.