Hello,   
      
   I have a very primitive question. I try to measure a diameter of my laser   
   beam. I use Newport Beam profiler. This camera has the ability to set the gain   
   and exposure. When I do the measurement with different exposure or gain (both   
   keep the beam without    
   saturation of the CCD) I obtain different values of the measurements.    
   I would be grateful for any help How to properly measure the diameter with   
   this cammera?   
      
   Thanks in advance,   
   Andriej   
      
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