Quality Control and
Data Processing

HC PLOTS
Flat fields
QC1 database (advanced users): browse | plot

Spectroscopic flat fields are used for determining the order profiles and the blaze functions per order. There are typically ten frames per input fibre (A or B). They are measured daily in HR with 1x1 and 2x1 binning; flat fields for UHR and MR are normally taken only when UHR or MR science data have been observed during the night.

Spectroscopic flat-field frame. Example raw frame for the blue detector. The apparent gaps in the orders come from the pre-/overscan of the read-out ports.

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
none	espresso_flat..fiba_snr_min	minimum SNR of all orders for fibre A	CAL		[docuSys coming]
none	espresso_flat..fibb_snr_min	minimum SNR of all orders for fibre B	CAL		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

The minimum signal-to-noise ratio per order is trended separately for fibres A and B and for the five different combinations of resolving power and binning: HR with 1x1 and 2x1 binning, UHR with 1x1 binning, and MR with 4x2 and 8x4 binning.

Scoring&thresholds Signal-to-noise ratio

Thresholds have not yet been defined.

History

No particular events.

Algorithm Signal-to-noise ratio

The pipeline calculates the signal-to-noise ratio for each order. The QC procedure determines from these values the minimum per fibre.

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
QC.EXT0.ROXm.ROYn.MAX.FLUX	espresso_flat..fiba_counts_max_blue	maximum number of counts for fibre A on blue detector [e-]	CAL		[docuSys coming]
QC.EXT1.ROXm.ROYn.MAX.FLUX	espresso_flat..fiba_counts_max_red	maximum number of counts for fibre A on red detector [e-]	CAL		[docuSys coming]
QC.EXT0.ROXm.ROYn.MAX.FLUX	espresso_flat..fibb_counts_max_blue	maximum number of counts for fibre B on blue detector [e-]	CAL		[docuSys coming]
QC.EXT1.ROXm.ROYn.MAX.FLUX	espresso_flat..fibb_counts_max_red	maximum number of counts for fibre B on red detector [e-]	CAL		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

The maximum number of counts is trended separately for fibres A and B, for both detectors, and for the five different combinations of resolving power and binning: HR with 1x1 and 2x1 binning, UHR with 1x1 binning, and MR with 4x2 and 8x4 binning.

Scoring&thresholds Counts and saturation check

The upper limit has been set to 60000 ADU which is slightly below the saturation limit of 65535 ADU. The lower limit is at 20000 ADU which represents the accepted range in early operations.

History

Data taken before October 2010 have been processed with a pipeline version that converted ADUs into electrons (with about 1.1 e-/ADU).

Algorithm Counts and saturation check

Pipeline calculated values per read-out port. The QC script uses these values to determine the maximum for each of the chips.