QC PLOTS
	CURRENT	HISTORY
Daily Health Checks:
ECH FMTCHK GratPos PhysM BLUE 346 2x3 DHC
ECH FMTCHK GratPos PhysM BLUE 437 2x3 DHC
ECH FMTCHK GratPos PhysM REDU 580 2x3 DHC
ECH FMTCHK GratPos PhysM REDU 860 2x3 DHC
ECH FMTCHK GratPos PhysM REDL 580 2x3 DHC
ECH FMTCHK GratPos PhysM REDL 860 2x3 DHC
ECH FMTCHK Thermal BLUE DHC
ECH FMTCHK Thermal REDU DHC
ECH FMTCHK Thermal REDL DHC
QC1 uves_fmtchk database (advanced users): browse | plot
Click on CURRENT to see the last trending (Health Check).    Click on HISTORY to see the historical evolution of the trending.

This tutorial provides information for the ECH - Grating Position Health Check trending.
The ECH - Grating Position trending is based on the measurement of QC1 parameters of FORMAT CHECK calibration data obtained with dedicated Health Check OBs executed daily. These OBs obtain four sets of FORMAT CHECK data, 2 sets in BLUE mode and 2 sets in RED mode, each set comprising a single RAW frame. Each set is acquired in a different wavelength setting covering the two arms and the four cross dispersers.

QC1 parameters

• average temperature of camera [C] (QC1 database table uves_fmtchk, column ins_temp1_mean, product keyword INS.TEMPi.MEAN)
  Description: Mean Temperature during the exposure.
• difference of X positions to physical model (QC1 database table uves_fmtchk, column mean_dx, product keyword QC.MODEL.DIFFXAVG)
  Description: The physical model used in Formatcheck step allows to measure the difference between model predicted and detected line positions. This is useful to verify precision of physical model prediction and instrument spectral format stability.
• difference of Y positions to physical model (QC1 database table uves_fmtchk, column mean_dy, product keyword QC.MODEL.DIFFYAVG)
  Description: The physical model used in Formatcheck step allows to measure the difference between model predicted and detected line positions. This is useful to verify precision of physical model prediction and instrument spectral format stability.
• number of lines selected (QC1 database table uves_fmtchk, column nlin_sel, product keyword QC.MODEL.NLINSEL)
  Description: The physical model used in the Formatcheck step allows to predict line positions on the formatcheck frame. The selected number of lines is the subset of the total number of lines which fall in the physical model plot limits.

QC1 parameters

• median of difference in X to reference frame (QC1 database table uves_fmtchk, column median_shftx, product keyword QC.SHFTXMED)
  Description: mmeasured median shift in x from stability check
• median of difference in Y to reference frame (QC1 database table uves_fmtchk, column median_shfty, product keyword QC.SHFTYMED)
  Description: measured median shift in y from stability check