PNS MANUAL: Setting up the CCDs
Setting up the WHT CCDs
This assumes that the WHT EEV 2x4k ccds have been mounted on both arms of the PN.S, as was done for commissioning. The orientation should be such that the spatial direction coincides with the long axis of the CCDs. A little bit of field is lost in the spectral direction this way, but not much.
Windowing the CCDs
The CCDs need to be windowed to keep down the readout times and data volumes. The windows used for PN.S commissioning were:
EEV12 on PNSL: window pnsl 1 "[1:2154,815:3314]"
EEV13 on PNSR: window pnsr 1 "[1:2154,801:3300]"
If possible please use the same windows, or at least the same SIZE windows.
Readout speeds
Readout noise is rather important as our background levels are low. Readnoise above 5e- should be avoided. At commissioning this meant using slow readout speed.
DAS command:
rspeed pnsl slow and ditto pnsr.
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Last updated 19-07-2001
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