Thanks Wildcat. You’re right that it’s limited to +30V but can see -43V. However, I didn’t have the +30V limit with the stock firmware. Before I installed Wildcat I was looking at +83Vmax sine waves that showed no clipping or distortion. Also, when I did the calibration with your firmware and it asked for 50-60V, I gave it 53V and the calibration screen read near 53. So it seems very unlikely that it’s a hardware problem.
I went back to Wildcat v2 and it had the same problem:
but I found that when I slid YPOS down, Vmax started showing larger values:
and when I slide it down far enough, I see +44.8V as expected, but I have to slide it almost to the bottom of the screen:
I swapped the battery poles and it reads -43.6V but I don’t have to slide YPOS way up, I can see -43.6V even with the line at the bottom of the screen:
In fact, I can slide YPOS down much father and it keeps reading -43.6Vmin for awhile but when it gets low enough (maybe 3/4 down the screen?) it starts scaling down and showing lower voltage for Vmin.