I've watched test six live with full sweep of the arms. There's instant and averages which will tell you if the reading is off due to smoothing.

I thought was nearly short circuit low and ≈ 450 Ω high. I could find the pictures I took when I fixed my weak wiper.

__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)