You had to do this with EZCAP. Terrible software. You must select Noise Analysis from the top menu as instructed.
I have setup my new QHY10 using this method apparently successfully but am getting poor results. I am hoping to get some expert help tomorrow from our club members. Will report back if they come up with a better system of calibration.
I ended up with setting of Gain 5 and Offset 117 but this varies with each camera but may be a good starting point for you. A club member with a QHY8 has had good results with Gain 5 and offset 120 so it seems in the ballpark.
Hope this helps a little.