VIMOS trending system: HISTORY plot
Last update: 2006-11-16T11:03:43 (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 Symbol
[info]		 Source* Average [info] Thresholds [info] N_data Data downloads Remarks
method value unit method value
1 •QC1DB MEDIAN2.790 ADU none  7 this | last_yr | all Q2, read noise, low gain, Garching values
2 •QC1DB MEDIAN3.180 ADU none  8 this | last_yr | all Q1, read noise, low gain, Garching values
3 •QC1DB MEDIAN7.590 ADU none  9 this | last_yr | all Q2, read noise, high gain, Garching values
4 •QC1DB MEDIAN9.340 ADU none  7 this | last_yr | all Q1, read noise, high gain, Garching values
5 •QC1DB MEDIAN2.470 ADU none  8 this | last_yr | all Q3, read noise, low gain, Garching values
6 •QC1DB MEDIAN2.830 ADU none  8 this | last_yr | all Q4, read noise, low gain, Garching values
7 •QC1DB MEDIAN6.910 ADU none  7 this | last_yr | all Q3, read noise, high gain, Garching values
8 •QC1DB MEDIAN8.190 ADU none  7 this | last_yr | all Q4, read noise, high gain, Garching values
*Data sources: OPSLOG: Paranal ops logs; 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