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VIMOS trending system: HISTORY report
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Last update: 2012-10-14T03:00:29 (UT)
same group: median_master ron_master rms_master ron_raw median_vs_temp   averages_low averages_high
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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 203 ADU VAL195,212 79 median_master this | last_yr | all Q2, median bias, low gain
2 •QC1DB MEDIAN 202 ADU VAL195,205 79 median_master this | last_yr | all Q1, median bias, low gain
3 •QC1DB MEDIAN 207 ADU VAL185,225 79 median_master this | last_yr | all Q2, median bias, high gain
4 •QC1DB MEDIAN 208 ADU VAL190,214 79 median_master this | last_yr | all Q1, median bias, high gain
5 •QC1DB MEDIAN 202 ADU VAL196,206 79 median_master this | last_yr | all Q3, median bias, low gain
6 •QC1DB MEDIAN 206 ADU VAL195,210 79 median_master this | last_yr | all Q4, median bias, low gain
7 •QC1DB MEDIAN 205 ADU VAL195,210 79 median_master this | last_yr | all Q3, median bias, high gain
8 •QC1DB MEDIAN 216 ADU VAL195,225 79 median_master this | last_yr | all Q4, median bias, high gain
*Data sources: QC1DB: QC1 database; LOCAL: local text file
Plot 1
data source:vimos_bias
(QC1 database)
dataset:median_master•
median:203ADU
fixed thresholds:195...212ADU
N_data plotted:79
[click on plot for closeup]
Plot 2
data source:vimos_bias
(QC1 database)
dataset:median_master•
median:202ADU
fixed thresholds:195...205ADU
N_data plotted:79
[click on plot for closeup]
Plot 3
data source:vimos_bias
(QC1 database)
dataset:median_master•
median:207ADU
fixed thresholds:185...225ADU
N_data plotted:79
[click on plot for closeup]
Plot 4
data source:vimos_bias
(QC1 database)
dataset:median_master•
median:208ADU
fixed thresholds:190...214ADU
N_data plotted:79
[click on plot for closeup]
Plot 5
data source:vimos_bias
(QC1 database)
dataset:median_master•
median:202ADU
fixed thresholds:196...206ADU
N_data plotted:79
[click on plot for closeup]
Plot 6
data source:vimos_bias
(QC1 database)
dataset:median_master•
median:206ADU
fixed thresholds:195...210ADU
N_data plotted:79
[click on plot for closeup]
Plot 7
data source:vimos_bias
(QC1 database)
dataset:median_master•
median:205ADU
fixed thresholds:195...210ADU
N_data plotted:79
[click on plot for closeup]
Plot 8
data source:vimos_bias
(QC1 database)
dataset:median_master•
median:216ADU
fixed thresholds:195...225ADU
N_data plotted:79
[click on plot for closeup]
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