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GIRAFFE trending system: HISTORY report
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Last update: 2022-01-15T16:30:25 (UT)
same group: dark linearity&gain fp-noise contamination   correlations
close window history: 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024   HEALTH FULL
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*Date on this monitor changes at 21:00 UT
png: Information and research:
- png file - advanced studies: QC1 browser | QC1 plotter
Plot
?
Symb
?
Source
*
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 oQC1DB MEDIAN 0.966 fraction VAL0.90,1.05 12 conta4 this | last_yr | all contamination measure of lower left corner (window 4)
2 QC1DB none   px none  12 conta4   static plot to indicate positions of contamination windows
3 oQC1DB MEDIAN 0.966 fraction VAL0.90,1.05 12 conta4 this | last_yr | all All four windows combined. Window 4
3 ΔQC1DB none   NONE none  12 conta1 this | last_yr | all window 1
3 QC1DB none   fraction none  12 conta2 this | last_yr | all window 2
3 QC1DB none   fraction none  12 conta3 this | last_yr | all window 3
*Data sources: QC1DB: QC1 database; LOCAL: local data source
Plot 1
data source:giraffe_ccd
(QC1 database)
dataset:conta4o
median:0.966fraction
fixed thresholds:0.9...1.05fraction
N_data plotted:12
[click plot for closeup]
Plot 2
data source:giraffe_ccd
(QC1 database)
dataset:conta4
average:none
thresholds:none
N_data plotted:12
[click plot for closeup]
Plot 3
data source:giraffe_ccd
(QC1 database)
dataset:
(numbers below apply to this dataset)
conta4o
median:0.966fraction
fixed thresholds:0.9...1.05fraction
N_data plotted:12
[click plot for closeup]
This plot

This is the trending plot for the monitoring of the GIRAFFE detector noise parameters, derived from image flats. These data are taken about monthly.

This plot trends the contamination measurements. The image flat with the highest exposure time is taken, its flux is measured in the five windows marked in plot 2, and normalized to the center (meaning the central box has always intensity 1 in plot 3). If contamination builds up, the relative efficiency will go down. The GIRAFFE CCD has a typical contamination pattern, with the lower left corner showing the strongest effect. Its value is plotted red and emphasized by the connecting line.

A decontamination procedure should be applied when the red data start to approach the value 0.9.

Other QC parameters related to detector properties are trended in the same group.  


General information

Click on any of the plots to see a close-up version.

The latest date is indicated on top of the plot.

If configured,

  • data points belonging to the latest date are specially marked
  • 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