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See section 9.3 for how to focus TAURUS in Fabry-Perot mode with the CCD.
The IPCS is a more complex detector to operate than the CCD, and can easily be damaged by overillumination. Its operation is not described in detail here, since it is described in the the IPCS users manual; please read this before using the IPCS.
The focus procedure for TAURUS with IPCS differs in two ways from the focus procedure for TAURUS with CCD. Firstly, it is necessary to open the IPCS shutter explicitly using the IPO command, before an EXPOSE command is issued. After an exposure is completed, the shutter is closed using the IPC command.
Secondly, and most importantly, remember that The IPCS can be severely damaged by over-illumination. Therefore, when observing a calibration lamp whose intensity is not known, the following procedure should be followed.