DC Hz and duty %

Panel v. my last controller the v meter would jump all over (abs) from vbatt to voc and between, the new one has a fast enough freq to display PV ave of vbatt and voc (abs). I saw a video (part 1 & part 2) of 30 hz and 15 hz controller and was just curious. Part 3 uses an oscilloscope.
https://www.youtube.com/watch?v=QqxI-l5a6d4

Salvo wrote:
You're better off measuring the input to the charge controller. In other words the panel voltage. It will have two states, either Vbat or Voc (open circuit panel voltage).

If you have an ammeter shunt in the line between the charger and the battery, try measuring on either side of the shunt. The voltage across the shunt may not be sufficient for the multimeter to pick up on, but if it does work it should give a good reliable answer.

The non-connected probe is acting as an antenna and is picking up 60 Hz through the "air".

You need to connect both probes. There isn't going to be much of a signal at the output of the charge controller. The battery will keep voltage at Vabs. You're better off measuring the input to the charge controller. In other words the panel voltage. It will have two states, either Vbat or Voc (open circuit panel voltage).