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VIMOS trending system: HISTORY plot
Last update: 2011-10-09T03:01:39 (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
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Symb
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Source
*
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 QC1DB MEDIAN 3.08752 ADU VAL0,8 87 ron_bias this | last_yr | all Q2, read noise, low gain
2 QC1DB MEDIAN 2.75001 ADU VAL0,8 87 ron_bias this | last_yr | all Q1, read noise, low gain
3 QC1DB MEDIAN 10.37067 ADU VAL0,40 87 ron_bias this | last_yr | all Q2, read noise, high gain
4 QC1DB MEDIAN 11.08832 ADU VAL0,40 87 ron_bias this | last_yr | all Q1, read noise, high gain
5 QC1DB MEDIAN 2.78881 ADU VAL0,8 87 ron_bias this | last_yr | all Q3, read noise, low gain
6 QC1DB MEDIAN 2.60971 ADU VAL0,8 87 ron_bias this | last_yr | all Q4, read noise, low gain
7 QC1DB MEDIAN 9.71279 ADU VAL0,40 87 ron_bias this | last_yr | all Q3, read noise, high gain
8 QC1DB MEDIAN 9.13353 ADU VAL0,40 87 ron_bias this | last_yr | all Q4, read noise, high gain
*Data sources: QC1DB: QC1 database; LOCAL: local text file
Plot 1
data source:vimos_bias
(QC1 database)
dataset:ron_bias
median:3.08752ADU
fixed thresholds:0.0...8.0ADU
N_data plotted:87
[click on plot for closeup]
Plot 2
data source:vimos_bias
(QC1 database)
dataset:ron_bias
median:2.75001ADU
fixed thresholds:0.0...8.0ADU
N_data plotted:87
[click on plot for closeup]
Plot 3
data source:vimos_bias
(QC1 database)
dataset:ron_bias
median:10.37067ADU
fixed thresholds:0.0...40.0ADU
N_data plotted:87
[click on plot for closeup]
Plot 4
data source:vimos_bias
(QC1 database)
dataset:ron_bias
median:11.08832ADU
fixed thresholds:0.0...40.0ADU
N_data plotted:87
[click on plot for closeup]
Plot 5
data source:vimos_bias
(QC1 database)
dataset:ron_bias
median:2.78881ADU
fixed thresholds:0.0...8.0ADU
N_data plotted:87
[click on plot for closeup]
Plot 6
data source:vimos_bias
(QC1 database)
dataset:ron_bias
median:2.60971ADU
fixed thresholds:0.0...8.0ADU
N_data plotted:87
[click on plot for closeup]
Plot 7
data source:vimos_bias
(QC1 database)
dataset:ron_bias
median:9.71279ADU
fixed thresholds:0.0...40.0ADU
N_data plotted:87
[click on plot for closeup]
Plot 8
data source:vimos_bias
(QC1 database)
dataset:ron_bias
median:9.13353ADU
fixed thresholds:0.0...40.0ADU
N_data plotted:87
[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