The calibration of the LWS instrument can be split into two main areas: the instrumental characteristics and the astronomical calibration. In this context, the instrumental characteristics calibration are those properties of the instrument which need to be known in order to extract the astronomical information from the data stream. These are mainly used in Derive-SPD (cf. section 6.3).
Astronomical calibration, on the other hand, is needed to convert from the internal "engineering" units of the instrument to astronomical units. This is mainly used in Auto-Analysis (cf. section 6.4).
The instrumental characteristics calibration can be divided into:
The astronomical calibration includes, for both grating and Fabry-Perots: