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XShooter Quality Control:
Bias

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QC links:
median level | read-out noise | structure
 
QC PLOTS
  CURRENT HISTORY
median of master bias UVB
VIS
read-out noise of raw bias bias UVB
VIS
read-out noise of master bias UVB
VIS
structure along x-axis of master bias UVB
VIS
structure along y-axis of master bias UVB
VIS
QC1 database (advanced users): browse | plot
   Click on CURRENT to see the current trending (Health Check).
   Click on HISTORY to see the historical evolution of the trending.


top Median Level

QC1 parameters

  • med_master (QC1 database table xshooter_bias, column median_master)
    gives the median level of the master bias.

History

  • 2010-12-05 The VIS CCD got a new cryostat.
top Read-Out Noise

QC1 parameters

  • ron_raw (QC1 database table xshooter_bias, column ron)
    gives the read-out noise of the raw bias.
  • ron_master (QC1 database table xshooter_bias, column ron_master)
    gives the read-out noise of the master bias.

History

  • 2010-11-23 VIS read-noise back within specs
  • 2010-03-06 - 2010-03-20 The VIS bias with readout 400k/lg shows a variable pattern, which also affects the read noise parameters. Additional work (improved shielding) in October 2010 reduced the pattern further, but slightly increased the read-noise.
top Structure

QC1 parameters

  • struct_x (QC1 database table xshooter_bias, columns struct_x1 and struct_x2 )
    gives the structure along the x-axis for the left (x1) and right (x2) half of the CCD. For that purpose the master bias is averaged along the y-axis and the resulting one-dimensional frame is fit with a linear expression. The slope of that expression is then stored as struct_x1/2.
  • struct_y (QC1 database table xshooter_bias, columns struct_y1 and struct_y2 )
    gives the structure along the y-axis for the top (y1) and bottom (y2) half of the CCD. For that purpose the master bias is averaged along the x-axis and the resulting one-dimensional frame is fit with a linear expression. The slope of that expression is then stored as struct_y1/2.

History

  • 2010-03-20 it is significantly reduced. Additional work (improved shielding) in October 2010 reduced it further.
  • 2010-03-06 The VIS bias with readout 400k/lg shows a variable pattern, which increases especially the struct_y parameters, but also the struct_x parameters. After

 
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