HI
with 403x sw is it possible to do a plot, p.e. of frequency , and then do another plot leaving the previous one on screen? Same as AP do.
Second question, there is a trick to undertstand if one value of Vin on 403 is close to the limit for the selected attenuation? I see that for 0dB the max is 2 Vrms, correct?
Each time I turn on the 403 the selected attenuation is 48 dB, in automatic, right?
( I hope that my question are clear) 
Thanks
Walter
In some case I go over but