Friday, March 20, 2015

Linearity Test

I also ran the linearity test from CCDAutopilot on the camera.

The script suggests adjusting the light source to allow 20000 ADU at 20 seconds of exposure.  The OIII filter does this nicely with the light panel I use for flats.

Interesting results show that the sensor goes nonlinear near 18000 ADU.  I've adjusted my settings for flats to be 17000 ADU.

This is the output of the script:

Start: 09:24 20 Mar 2015

Tolerance: 0.1
Binning: 1x1



Exposure   ADU/sec.

05 sec.    1036

10 sec.    1037

15 sec.    1030

20 sec.    1017

25 sec.    1006

30 sec.    1023

35 sec.    1041

40 sec.    1032

45 sec.    1011



Linearity appears to have

turned over at: 20126 ADU

Max. linear ADU: 18114

End: 09:34 20 Mar 2015