Figured I'd post these since Jude is bragging about his AP555. Noise floor is higher here because I'm using a balanced probe with a /10 divider (less spurious garbage, but at the expense of moving the noise floor up 10db). I wouldn't worry about it because really, anything under 100db from the main signal... yeah, only John Atkinson cares to interpret stuff like that. It seems like a good night tonight for measurements (that's how HARD they are to do and get consistently - so many environmental factors can screw things up). I'm also running it through a Wyrd, because the Wyrd provides cleaner power and has the current capacity of the USB spec, which is something computer makers don't always meet. BTW 1kHz measurement here. Something not available at HF.