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Health Check monitor

 

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UVES:
gratings: position
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UVES trending system: HEALTH CHECK report
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Last update: 2014-10-02T06:05:33 (UT)
  | now: 2014-10-02T10:18:57 (UT) muc02 QC pipeline: uves-5.4.0 (installed 2014-03-26)
same group: 520_Plate1 580_P1 860_P1   520_Plate2 580_P2 860_P2
General news:
UVES news:
Report news:
DATE*: [?] 2014-09-25
report | NLT
2014-09-26
report | NLT
2014-09-27
report | NLT
2014-09-28
report | NLT
2014-09-29
report | NLT
2014-09-30
report | NLT
2014-10-01
report | NLT
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  last OPSLOG data:
2014-09-30*

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*Date on this monitor changes at 21:00 UT
Print: Information and research:
- png file - advanced studies: QC1 browser | QC1 plotter
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 (9) MEDIAN -2.13 pixels OFF± 1.5 102 mean_dx this | last_yr | all DeltaX between solution and Physical Model, from MOS FMTCHK data, 520.0nm, 1x1, Plate 1, RED UPPER CCD
2 QC1DB yes (9) MEDIAN 4.09 pixels OFF± 1.5 102 mean_dy this | last_yr | all DeltaY, same data set
3 QC1DB yes (9) MEDIAN 646 pixels VAL350,850 102 nlin_sel this | last_yr | all Number of lines used in the solution, same data set

4 QC1DB yes (9) MEDIAN 0.756 pixels OFF± 1.5 102 mean_dx this | last_yr | all DeltaX between solution and physical model, 520.0nm, 1x1, Plate 1, RED LOWER CCD
5 QC1DB yes (9) MEDIAN 3.21 pixels OFF± 1.5 102 mean_dy this | last_yr | all DeltaY, same data set
6 QC1DB yes (9) MEDIAN 804 pixels VAL400,1150 102 nlin_sel this | last_yr | all Number of lines used in the solution, same data set
*Data sources: QC1DB: QC1 database; LOCAL: local text file | **OPS: OPSLOG data are included
Plot 1
scores: 7|
data source:uves_fib_fmtchk
(QC1 database)
dataset:mean_dx
median:-2.13pixels
rel. thresholds: -3.6345...-0.6345pixels
N_data plotted:102
[click on plot for closeup]
Plot 2
scores: 7|
data source:uves_fib_fmtchk
(QC1 database)
dataset:mean_dy
median:4.09pixels
rel. thresholds: 2.5875...5.5875pixels
N_data plotted:102
[click on plot for closeup]
Plot 3
scores: 7|
data source:uves_fib_fmtchk
(QC1 database)
dataset:nlin_sel
median:646pixels
fixed thresholds:350...850pixels
N_data plotted:102
[click on plot for closeup]
Plot 4
scores: 7|
data source:uves_fib_fmtchk
(QC1 database)
dataset:mean_dx
median:0.756pixels
rel. thresholds: -0.744...2.256pixels
N_data plotted:102
[click on plot for closeup]
Plot 5
scores: 7|
data source:uves_fib_fmtchk
(QC1 database)
dataset:mean_dy
median:3.21pixels
rel. thresholds: 1.708...4.708pixels
N_data plotted:102
[click on plot for closeup]
Plot 6
scores: 7|
data source:uves_fib_fmtchk
(QC1 database)
dataset:nlin_sel
median:804pixels
fixed thresholds:400...1150pixels
N_data plotted:102
[click on plot for closeup]
This plot

This is the trending report for the grating stability in FLAMES/UVES, derived from the MOS format check calibrations taken with wavelength setting 520, 1x1 binning and Plate 1. This setup measures the position of CD#3. It is partly redundant with the 580 P1 plot (which monitors the same cross-disperser) but is displayed for completeness.

Since 2010 these data are taken daily as part of the Daily Health Checks.

Calibrating SCIENCE observations made during the night with calibrations taken during the day relies on the stability and reproducibility of the positioning of the instrument components. To insure an accurate wavelength calibration, one of the critical criteria is the accuracy of the positioning of the gratings. If the highest possible accuracy is required for the wavelength calibration, an attached wavelength calibration should be taken with the science. Alternatively, since the exact grating position can not be measured in the science image itself, we rely on the daily health check format check data to verify the stability and reproducibility from day to day, assuming that this is a reaasonable indication of the reproducibility between nighttime science and daytime calibrations.

With this in mind the important aspects in these plots are the day to day scatter. The absolute level, within reason (i.e. plus or minus 10 pixels) is not important. From time to time there are sudden jumps in the mean levels, often due to earthquakes, but often the cause of the jump is far from obvious. Such jumps are not in themselves a cause for immediate concern. Only if they are happening frequently, and liable to be happening during the night. Or if they take the instrument so far from the Physical Model that the pipeline will have serious difficulties to converge to a solution, as a rule of thumb, intervention to realign should be considered if the residuals exceed plus or minus 10 pixels.

The individual plots describe, separately for the UPPER CCD (upper row) and the LOWER CCD:

  • the mean residuals in X and Y of the fitted position of the emission lines with respect to the positions expected from the Physical Model;
  • the number of emmission lines selected in the final solution; trends in this parameter can be due to lamp aging effects.

Find more information about FLAMES/UVES Grating Position monitoring here.  


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