TBS settings

Hi,

My 570 randomly has jitters. I keep the throttle in one position and it either adds extra throttle or if I push throttle it doesn’t react. This also happens right after I go for a short 5 minute ride.
Now I wanted to check if my TBS is offset. My Manual sais that one value is 0.43 Vdc when throttle is closed, does anyone know the value when it is open?