|
Yugant, this is the procedure if you are starting off first time -
Place the dust cover onto the camera, set the gain to 0 and then take a 1msec exposure. Adjust the offset number so that the RMS ADU reading is somewhere between 500 and 1000 ADU. In my case with the QHY12 the offset was 126 to get a 700 ADU bias reading.
Then do a full well test, remove the dust cover and point the camera to a wall that is not too bright. Keep increasing the exposure times and create a table as follows
1sec - 39600 ADU
2sec - 57600
3sec - 61900
4sec - 63340
5sec - 63340
10sec - 63350
30sec - 63390
As you can see the ADU count has flattened out after 4 sec's, so we now set the exposure to 4secs and increase the gain until it reaches 65,000 ADU.
In my case the gain was set to 10, and then you can retest the bias level again which for me was reducing the offset to 125.
Hope this helps
Bill
|