1. Obtaining bias and dark frames.
2. Combined bias and dark frames.

As well see in the following sections of this document, the bias and dark levels of the acm appear to be variable. At this time (Jan2018) it remains unclear if this variability is a function of temperature or some other property. To help eliminate some possibilitiies I have prepare several scripts that should be used observers to obtain the bias and dark frames for acm. This scripts handle things like insuring that light-emitting sources, like the PV camera, are powwered off and that the FCU head is deployed abd the acm mirror is retracted. All of thses measures are designed to insure that unwanted sources of scattered light will not reach the acm when bias and dark images are being taken. Here are the commands the RA should use:

 
# Take 43 acm bias frames    
% acm_bias_run 43 
arg1 - number of bias images to take  

# Take 21 5-second acm dark frames    
% acm_dark_run 21 5  
arg1 - number of images to take  
arg2 - integration time (5, 10, 20) 

In the last section we made a cursory survey of the night's images with an eye towards locating any bia and dark frames. If such calibration times were taken, then the next step is to combine them to produce master bias and dark frames for the night. Use the following link to read about the procedures for building master bias and dark frames.