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Health Check monitor
 
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SPHERE trending system: KPI report
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Last update: 2025-12-19T05:20:41 (UT)
  | now: 2025-12-19T07:24:03 (UT) muc03 QC pipeline: spher-0.56.0 (installed 2024-09-26)
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.
SPHERE news: Note that the current Health Check monitor runs with an incomplete pipeline and an incomplete set of QC1 parameters. QCG can currently not guarantee completeness and significance at the usual level.
Report news:

scores&comments | history: all data plotted here | plot tutorial ... | contact | HC_docu... | quality events...               [?] 		*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 •QC1DB none   ADU none  982 qc_ron all (full time range) setup: DIT=2, NDIT=40, Nondest
2 •QC1DB none   ADU none  980 qc_ron all (full time range) setup: DIT=30, NDIT=15, Nondest
*Data sources: QC1DB: QC1 database; LOCAL: local data source
Plot 1
data source:sphere_ifs_dark
(QC1 database)
dataset:qc_ron•
average:none
thresholds:none
N_data plotted:982
(current) reference:5.12
[click plot for closeup]
Plot 2
data source:sphere_ifs_dark
(QC1 database)
dataset:qc_ron•
average:none
thresholds:none
N_data plotted:980
(current) reference:11.6
[click plot for closeup]
This plot

According to

  • VLT-SPE-SPH-14690-0083 (SPHERE Technical Specification)
  • VLT-MAN-SPH-14690-0430 P104.0
The IFS detector read out noise is specified to be lower than 15e-. Given the gain (see user manual) of 1.8 e-/ADU, this results in 8.33 ADU (IFS).

Please note the temperature dependence documented in the FULL plots.

Evaluation:

For IFS, DIT=2 the ron is below the specification, but for DIT=30 the detector is underperformant. More precisely: The detetctor read noise and the dark level induced photon noise at DIT=30 cannot be disentangled, resulting in a measurement of the statistical noise of 11 ADU, while the detector ron contribution alone might be still below the specification. As the KPI plot reference value we choose the long-term average 5.12 ADU (DIT=2) and 11.6 ADU (DIT=30)  

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