Astronomical station Vidojevica: In situ test of the ALTA Apogee U42 CCD camera

Currently, the CCD camera most used by observers of the Astronomical Observatory of Belgrade is the ALTA Apogee U42. It is used for both photometric and astrometric observations. Therefore, it is very important to know different measurable parameters which describe the condition of the camera - linearity, gain, readout noise etc. In this paper, we present a thorough test of this camera.