QUALITY CONTROL TESTS
Dark current measurements and hot pixels monitoring. The script to be used is here. It takes about 1h to run the script.
Gain calibration and linearity calibration. Exact procedure still to be written.
Measure standards stars during photometric nights to monitor the photometric zero points, or equivalently the throughput of the instrument in imaging mode.
Measure a bright star at different positions along the slit. The trace
of the spectra should be aligned with the detector rows close to the
slit centre. These measurements are also useful to determine the
curvature of the spectral traces along the slit length and correct
spectral distortion when observing extended targets. The script which
moves the target along the slit can be found here.
The goal of this test is to monitor possible variations of the
local sky background emission due to changes in the telescope
environment. Select imaging mode and point to a standard photometric
field close to the zenith. Perfom a sequence of short exposures at
different airmasses. The background must increase with airmass, the
extrapolation to zero airmass should give the local background.
The measurement should be done during a photometric night in order to
have a proper calibration. The priority is filter Ks,
although J and H should be done from time to time.