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.

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.

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.

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