!!calss Calibration

makebias makes a bias frame out of a run

makebias is a simple shortcut for the common operation of grabbing a series of frames, making a list of them and then combining the result to make a bias. It does this with no trimming, and uses all of the frames in the bias except the first and the last. If you want to do something different, do it by hand. As well as the output file, the list of files used is left in a file of the form 'run003.lis'; the intermediate ucm frames are deleted. It eliminates the first frame because often its exposure time is shorter than all subsequent frames and thus is a bad frame for setting the exposure time as needed for proper dark subtraction. It eliminates the last because the user might have terminated it early and therefore it does not represent a good bias either.


makebias run first output


run---The name of the run
first---first frame to use. Normally 1, but > 1 for drift mode runs
output---the name of the output file


This command is a member of the classes: Observing, Scripts.

Author: T.R. Marsh
Created: 17 Mar 2006
Revised: 16 Nov 2007

Page generated Fri Jul 5 12:23:42 2013