VIMOS trending system: HISTORY plot
Last update: 2007-10-14T13:10:40 (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
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*Date on this monitor changes at 21:00 UT
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Plot
[info]		 Symbol
[info]		 Source* Average [info] Thresholds [info] N_data Data downloads Remarks
method value unit method value
1 •QC1DB MEDIAN 193.000 ADU 3SIG± 1.482 83 this | last_yr | all Q2, median bias, low gain, Garching values
2 •QC1DB MEDIAN 195.000 ADU 3SIG± 1.218 83 this | last_yr | all Q1, median bias, low gain, Garching values
3 •QC1DB MEDIAN 185.000 ADU 3SIG± 2.789 83 this | last_yr | all Q2, median bias, high gain, Garching values
4 •QC1DB MEDIAN 194.000 ADU 3SIG± 2.578 83 this | last_yr | all Q1, median bias, high gain, Garching values
5 •QC1DB MEDIAN 196.000 ADU 3SIG± 1.436 83 this | last_yr | all Q3, median bias, low gain, Garching values
6 •QC1DB MEDIAN 194.000 ADU 3SIG± 1.645 83 this | last_yr | all Q4, median bias, low gain, Garching values
7 •QC1DB MEDIAN 191.000 ADU 3SIG± 3.917 83 this | last_yr | all Q3, median bias, high gain, Garching values
8 •QC1DB MEDIAN 196.000 ADU 3SIG± 3.641 83 this | last_yr | all Q4, median bias, high gain, Garching values
*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