Purpose

Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/precise/Midas_doc/doc/94NOV/vol2/node63.html
Дата изменения: Fri Feb 23 14:03:47 1996
Дата индексирования: Tue Oct 2 17:26:47 2012
Кодировка:
Поисковые слова: http astrokuban.info astrokuban

Purpose

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Purpose

In order to monitor all CCDs available on La Silla, to ensure the quality of the data delivered by the CCDs, and to serve the user community with that information, ESO runs programme of CCD tests at the Observatory. In this CCD monitoring programme, for each CCD test the following data is collected:

9 bias frames;
16 pairs of flat fields (both of each pair have the same integration time) using a stable light source and with exposure levels ranging from just above bias to digital saturation;
9 low-count-level (of order a few hundred electrons per pixel) flat-fields with stable light source;
one flat-field exposure obtained with 64 rapid shutter cycles;
3 30-minute dark images;
the time taken to read out and display an image.

The quality of the data collected is checked using a number of commands and procedures available in the MIDAS CCD context. Although the composition of the calibration data of the user is most not identical to ESO's test data set, the same CCD commands can still be executed to check the quality of the user's calibration data.

Pascal Ballester
Tue Mar 28 16:52:29 MET DST 1995