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VIMOS trending system: HISTORY plot
Last update: 2009-07-12T03:31:28 (UT)
same group: median_master ron_master rms_master ron_raw median_vs_temp   averages_low averages_high
close window history: 2003 2004 2005 2006 2007 2008   2009   2010   2011 2012 2013 2014 2015 2016 2017 2018   HEALTH FULL
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*Date on this monitor changes at 21:00 UT
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Plot
?		 Symb
?		 Source
*		 Average ? Thresholds ? N_
data		 QC1
parameter		 Data
downloads		 Remarks
method value unit method value
1 •QC1DB MEDIAN 2.33626 ADU VAL0,6 92 ron_bias this | last_yr | all Q2, read noise, low gain
2 •QC1DB MEDIAN 2.64457 ADU VAL0,6 92 ron_bias this | last_yr | all Q1, read noise, low gain
3 •QC1DB MEDIAN 7.31802 ADU VAL0,20 91 ron_bias this | last_yr | all Q2, read noise, high gain
4 •QC1DB MEDIAN 9.15443 ADU VAL0,20 91 ron_bias this | last_yr | all Q1, read noise, high gain
5 •QC1DB MEDIAN 2.24479 ADU VAL0,6 92 ron_bias this | last_yr | all Q3, read noise, low gain
6 •QC1DB MEDIAN 2.34997 ADU VAL0,6 92 ron_bias this | last_yr | all Q4, read noise, low gain
7 •QC1DB MEDIAN 6.96086 ADU VAL0,20 91 ron_bias this | last_yr | all Q3, read noise, high gain
8 •QC1DB MEDIAN 7.27771 ADU VAL0,20 91 ron_bias this | last_yr | all Q4, read noise, high gain
*Data sources: QC1DB: QC1 database; LOCAL: local text file
This plot

Trending plots for bias QC parameters.

All bias parameters are measured in the central 1600x1800 pixels of the detectors. The median bias level and the rms of the master should show a stable trend without sudden jumps or increase/decrease. The read-out noise (ron_raw) is calculated from the difference of the first two raw frames. Some outliers with high values are occasionally observed due to cosmic ray events. The read-out noise as measured from master frames (ron_master) should be extremely stable.

The new detectors (since July 2010) show a correlation of the bias level with temperature, especially for quadrant 2.

Bias frames are usually measured daily during day-time. They come in two different varieties: with low gain (used for imaging) and with high gain (used to calibrate the spectroscopic modes).

Template IDs: img_cal_Dark and spec_cal_Dark. Pipeline recipe: vmbias.  

General information

Click on any of the plots to see a close-up version. The latest date is indicated on top of the plot, data points belonging to that date are specially marked.

If configured,

  • statistical averages are indicated by a solid line, and thresholds by broken lines
  • outliers are marked by a red asterisk. They are defined as data points outside the threshold lines
  • "aliens" (= data points outside the plot Y limits) are marked by a red arrow (↑ or ↓)
  • you can download the data for each parameter set if the 'Data downloads' link shows up