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GIRAFFE trending system: HISTORY report
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Last update: 2019-03-28T15:21:30 (UT)
same group: dark linearity&gain fp-noise contamination   correlations
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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
- trending of linearity and gain here
Plot
?
Symb
?
Source
*
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 QC1DB none   ADU none  190 mean_signal this | last_yr | all mean image flat value in ADU, as function of exposure time (one year date range as indicated on the plot) (normal read mode)
3 QC1DB none   ADU/sec none  184 median_dit this | last_yr | all values from plot no. 1, normalized by exptime (normal read mode)
4 QC1DB none   el/ADU none  185 conad this | last_yr | all gain* values as function of mean flux in the image flats; only for new CCD)
(*note: the QC1 parameter is called conad by mistake, it should read gain) (normal read mode)
*Data sources: QC1DB: QC1 database; LOCAL: local data source
Plot 1
data source:giraffe_ccd
(QC1 database)
dataset:mean_signal
average:none
thresholds:none
N_data plotted:190
[click plot for closeup]
Plot 3
data source:giraffe_ccd
(QC1 database)
dataset:median_dit
average:none
thresholds:none
N_data plotted:184
[click plot for closeup]
Plot 4
data source:giraffe_ccd
(QC1 database)
dataset:conad
average:none
thresholds:none
N_data plotted:185
[click plot for closeup]
This plot

This report hosts correlation plots for the monitoring of the GIRAFFE linearity and gain, derived from image flats. These data are taken about monthly. Since 2008-07, they are acquired with the common detector monitoring template and reduced with the corresponding common recipe.

Note the CCD upgrade between 2008-03 and 2008-05. Plots #3 and 4 are available for the new CCD only.

A sequence of image flats is exposed between 0.5 and 220 secs. Their average exposure level is plotted against the exposure time (box 1). The fitted function corresponds to mean = 245*exptime for the old CCD, and 195*exptime for the new CCD. In box 3, non-linear residuals are plotted vs. exposure time (new CCD only).

PLot 4 (for the new CCD only) shows the GAIN values plotted over exposure time. The asymptotic value for texp -> 0 is the true GAIN. The value stored in the file headers is indicated as "nominal".

Find the trending of non-linearity coefficient and gain here.  


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