- Make sure you have requested the half-wave plate in your NOT NIRF. Should
only be installed by staff.
- In the PP program you choose Linear Polarisation under MODE menu, which
is default by starting up PP. Also, the default set-up for linear
polarisation is 10s integration time and a cycle of 4 complete polarisation
measurements. Each measurement consists of 8 integrations. These are
simultaneous integrations in UBVRI of the ordinary and the extra-ordinary
component through the calcite prism as the half-wave retarder is rotated in
22.5 degrees. Such a measurement takes about 3.5 minutes with the default
parameters, which are normally used for stellar observations, and a complete
cycle of 4 measurements takes about 15 minutes, after which you should take a
sky integraton. See the Signal to Noise plot for
different magnitudes and number of cycles using this setup.
The highest time resolution in this mode is about 60 seconds (and about 5
seconds for the simultaneously obtained photometry).