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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