Moffy - you are 100% correct. But considering that the whole point of having a DHO900S is more or less the advertized Bode Plot function, what sense does it make to purchase this scope while you've still got to do the "heavy lifting" in a PC. Moreover, my findings with the instability of the inegrated AWG (bugs thread) won't make me feel any better regarding a PC-operated DHO900S. In this case, "any old scope" with phase difference and amplitude measurement and a digital AWG will do the trick. Or, as I mentioned somewhere before, one of these "analog workbench" gadgets will do a pretty good job at Bode Plotting / Network Analysis as well.