QC PLOTS
	CURRENT	HISTORY
Daily Health Checks:
Parasitic Light SM
QC1 uves_dark 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 Parasitic Dark Health Check trending.
The Parasitic Dark trending is based on the measurement of QC1 parameters of so-called Parasitic Light DARK calibration data obtained with dedicated Health Check OBs executed approxiamtely monthly. These OBs obtain two sets of PARASITIC_DARK data, 1 set in BLUE mode and 1 set in RED mode, each set comprising a single RAW frame. The two sets thus provide information about parasitic light affecting both arms of the spectrograph.

QC1 parameters

• mean_dark normalized to 3600 secs exposure time (QC1 database table uves_dark, column current_dark)
  Description: The mean value reported by the MIDAS command stat/image computed on the entire chip is divided by the exposure time in sec and then multiplied by 3600 sec.