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Last update: 2014-12-27T22:07:01 (UT)
  | now: 2014-12-28T17:36:41 (UT) muc07 QC pipeline: vcam-1.3.3 (installed 2014-10-20)
same group: LINEARITY BADPIX_FRACTION SCREEN_VARIATION BRIGHTEST_FLAT
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- png file - advanced studies: QC1 browser | QC1 plotter
  • detector #13 shows a high but constant non-linearity of 10% at 10000 ADU.
Plot
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Symb
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Source
*
OPS?
**
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 QC1DB yes (2) MEDIAN 3.6 % VAL2.65,4.65 23 qc_linearity this | last_yr | all LINEARITY, average over all 16 detectors
2 QC1DB yes (32) MEDIAN 3.23 % VAL-1,20 368 qc_linearity this | last_yr | all LINEARITY, values of all detetcors
2 QC1DB yes (32) none   % none  23 qc_linearity this | last_yr | all LINEARITY, values of detector 7
2 QC1DB yes (32) none   % none  23 qc_linearity this | last_yr | all LINEARITY, values of detector 3
3 QC1DB yes (2) MEDIAN 2.26 % VAL1.7,2.6 23 qc_linearity this | last_yr | all LINEARITY, stdev over all detectors
4 LOCAL no none   % none  351 qc_linearity n/a Score per Detector: Green = within the thresholds
4 LOCAL no none   % none  1 qc_linearity n/a Score per Detector: Red = beyond thresholds
4 .LOCAL no none   % none  351 qc_linearity n/a Score per Detector: Green = within the thresholds
4 .LOCAL no none   % none  1 qc_linearity n/a Score per Detector: Red = beyond thresholds
*Data sources: QC1DB: QC1 database; LOCAL: local text file | **OPS: OPSLOG data are included
Plot 1
scores: 2|
data source:vircam_line
(QC1 database)
dataset:qc_linearity
median:3.6%
fixed thresholds:2.65...4.65%
N_data plotted:23
[click on plot for closeup]
Plot 2
scores: not implemented
data source:vircam_line
(QC1 database)
dataset:
(numbers below apply to this dataset)
qc_linearity
median:3.23%
fixed thresholds:-1...20%
N_data plotted:368
[click on plot for closeup]
Plot 3
scores: 2|
data source:vircam_line
(QC1 database)
dataset:qc_linearity
median:2.26%
fixed thresholds:1.7...2.6%
N_data plotted:23
[click on plot for closeup]
Plot 4
scores: not implemented
data source:local text file
dataset:
(numbers below apply to this dataset)
qc_linearity
average:none
thresholds:none
N_data plotted:351
[click on plot for closeup]
This plot

Trending plot for Non-linearity at 10000 ADU in per cent.

QC parameters is derived from each detector monthly linearity frames.

Name:
Fits header: QC.LINEARITY,
QC1 DB: qc_linearity

Description:
From the stack of flat frames with different values of DIT of a constant luminosity source. the observed relation between counts and DIT is compared against a linear relation: counts = A + B * DIT. The QC.LINEARITY is the deviation at 10000 ADU flux level in percent

Setup:
These plots describe:
Fig. 1. Average view: The QC parameter averaged over all detectors. This view is sensitive to common changes.
Fig. 2. Resolved View: The QC parameter resolved for all detectors.
Fig. 3. Scatter View: The standard deviation of the QC parameter, obtained from the sample of all detectors. This view is sensitive changes of individual detectors.
Fig. 4. Scoring View: Scoring values of all 16 QC parameters. Green = within the acceptance thresholds. Red = beyond the acceptance thresholds.

In plot (2) chip #13 shows the largest non-linerarity among all other chips.

Find more information on the VIRCAM LINEARITY tutorial page.

 


General information

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

If applicable, the latest values from Paranal ops logs are plotted as blue dots. More information about those values, including a download option, is available in the OPS column.

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