Quality Control and
Data Processing

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

Spectroscopic flux standard stars are observed in order to measure the absolute efficiency. They are measured on a bi-weekly basis in HR with 1x1 and 2x1 binning and in UHR with 1x1 binning. Observations in MR are not yet regularly executed.

Flux standard star. 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
QC.MAX.ABS.EFF	espresso_std..abseff_max	maximum of absolute efficiency	HC		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

The absolute efficiency is trended separately 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. In case of HR and UHR, it is also trended separately for each of the four Untit Telescopes.

Scoring&thresholds Absolute efficiency

Scoring is not implemented since these are on-sky observations which are intrinsically variable.

History

The trending plots only contain data measured after 2018-07-01. Earlier measurements have been processed with pipeline versions that did not always give reliable results for the maximum of the efficiency.

Algorithm Absolute efficiency

The trended quantity is the maximum of the efficiency over the complete spectral range.