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XSHOOTER trending system: KPI report
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Last update: 2020-07-17T04:51:37 (UT)
  | now: 2025-09-12T06:28:51 (UT) muc02 QC pipeline: xshoo-3.4.0 (installed 2020-03-26)
General news: NOTE: The Health Check and calChecker services are moved to qcFlow on an instrument by instrument basis. The current pages will not be updated any longer once the move has been finished.
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scores&comments | history: all data plotted here | plot tutorial ... | contact | HC_docu...               [?] 		*Date on this monitor changes at 21:00 UT
png: Information and research:
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Plot
?		 Symb
?		 Source
*		 Average ? Thresholds ? N_
data		 QC1
parameter		 Data
downloads		 Remarks
method value unit method value
1 •QC1DB none   e-/ADU none  151 non_linear all (full time range) NIR non_linearity at 10000 ADU
*Data sources: QC1DB: QC1 database; LOCAL: local data source
Plot 1
data source:xshooter_detmon
(QC1 database)
dataset:non_linear•
average:none
thresholds:none
N_data plotted:151
(current) reference:-0.01 0.01
[click plot for closeup]
This plot

According to

  • ESO-327242, Integrating Instrument Performance in the Quality Control Process - X-shooter
  • VLT-SPE-ESO-14650-3323, X-SHOOTER Technical Specification

The detector non-linearity is specified to be < 1% in the dynamic range of 10-100000e-, which corresponds to 64000 ADU. For the NIR-arm 1.0% is specified.

Given the history of detector monitoring, the UVB/VIS non-linearity is based on the central parts (1000 x 1000 pixel) of imaging flats illuminated up to 65000 ADU in the central part (although other regions of the chips might be saturated due to an illumination gradient). The measured non-linearity is extrapolated to the saturation level of 65535 ADU.
The NIR-arm non-linearity is based on a smaller window (200 x 40 pixel) matching an order in the spectroscopic echelle flat. Flats up to 42000 ADU are used (at counts > 42000 ADU, the detector starts to extrapolate the signal) The non-linearity is given at a reference level of 10000 ADU.  

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