THE 2-DIMENSIONAL SPECTROMETER IN THE GERMAN VACUUM-TOWER-TELESCOPE TENERIFE

From its earliest conception, the two-dimensional spectrometer for hig h-resolution solar observation has been a very versatile, hence comple x instrument. Since its first successful employment in the Vacuum Towe r Telescope (VTT) on Tenerife in 1990, its set-up has been modified an d improved to meet the demands of an increasing number of various obse rvational aims. To take full advantage of its many possibilities requi res to be familiar with the principal rules of handling the instrument itself, thus relevant information on observing techniques is given he re. It is impossible, though, to make intelligent use of the data obta ined with this spectrometer without exact knowledge of the instrumenta l effects entailing special items in the data reduction. Therefore, em phasis is put on essential components, their configuration within the Light paths, and the consequences for the proper treatment of the data in order to obtain reliable results. After thorough discussion of the se peculiar features of the data analysis which are commonly unknown, the current range of users and the next steps towards further improvem ents of the instrument are presented.