Marc and Yuhang

We checked again the connection from ground to power supply or signal output today. And we realize that we were not checking in a good way last week.

This time, we measured the resistor between ground and many other parts. We found the resistor is as high as from 0.3kOhm to 0.9kOhm. In this case, it means the ground is well isolated with those channels. So there should not be ground issue.