Hi Rob,
(i believe we have the same ultrasonic units…one of mine keeps stalling out a 45 degrees instead of the 65 degrees as set
Interesting…i think you might have gotten holes (bad sample) due to longer test time of 5 minutes, versus shorter test time of 1 minute…
Perhaps try test again for the shorter amount of time- 1 minute instead of 5 minutes.
foil should have uniform fine dimpling…if smooth sections are apparent, I believe that indicates that that particular coverage areas “thingeys” are not working at optimum…
see video link below…at around the 2:40minute mark for samples of foil dimpling (good sample) and holes (bad sample)
