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VIMOS trending system: HISTORY plot
Last update: 2009-08-13T07:32:02 (UT)
same group: X0_Y0 XX_YY XY_YX   Y0_TEMP
close window history: 2006 2007 2008   2009   2010   2011 2012 2013 2014 2015 2016 2017 2018   HEALTH
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*Date on this monitor changes at 21:00 UT
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- png file - advanced studies: QC1 browser | QC1 plotter
Average ? Thresholds ? N_
method value unit method value
1 QC1DB MEDIAN 8.36663 pix/mm VAL8.361,8.370 98 xx this | last_yr | all coefficient a(xx), Q2
2 QC1DB MEDIAN 8.38494 pix/mm VAL8.380,8.389 98 xx this | last_yr | all coefficient a(xx), Q1
3 QC1DB MEDIAN 8.36538 pix/mm VAL8.360,8.369 98 yy this | last_yr | all coefficient a(yy), Q2
4 QC1DB MEDIAN 8.38399 pix/mm VAL8.379,8.388 98 yy this | last_yr | all coefficient a(yy), Q1
5 QC1DB MEDIAN 8.394 pix/mm VAL8.389,8.398 98 xx this | last_yr | all coefficient a(xx), Q3
6 QC1DB MEDIAN 8.39321 pix/mm VAL8.388,8.397 95 xx this | last_yr | all coefficient a(xx), Q4
7 QC1DB MEDIAN 8.39273 pix/mm VAL8.387,8.396 98 yy this | last_yr | all coefficient a(yy), Q3
8 QC1DB MEDIAN 8.3917 pix/mm VAL8.387,8.396 95 yy this | last_yr | all coefficient a(yy), Q4
*Data sources: QC1DB: QC1 database; LOCAL: local text file
This plot

Trending plots for monitoring the coefficients of the mask to CCD transformation.

The transformation is as follows:
X = a(xx)*x + a(xy)*y + x(0)
Y = a(yx)*x + a(yy)*y + y(0)
with (x,y) being mask coordinates in mm and (X,Y) CCD coordinates in pixel. X direction is along the slit orientation, y direction is perpendicular to the slits (i.e. in dispersion direction).

These trending plots show the time evolution of the matrix coefficients a(xx), a(xy), a(yx), and a(yy). The diagonal coefficients a(xx) and a(yy) give the scale factor between mask and CCD (near 8.4 pixel/mm). Variations are mainly cause by temperature changes, the empirical tolerance is around +/- 0.006 pixel/mm. The coefficients a(xy) and a(yx) give the rotation and should be near zero. The tolerance is +/- 0.005 pixel/mm around the empirical average. The procedure in case of violation of the thresholds is described on the SciOps Wiki pages.

Template ID: img_tec_MaskToCcd. Pipeline recipe: vmmasktoccd.  

General information

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