Background

This document descibes the procedure for turning off power to the DEIMOS science CCD array or the Flexure Compensation System (FCS) detector system.

Procedure

1. Log into deimosserver using the dmoseng account.
2. From the command line prompt in an xterm window, initiate a remote controlled shutdown of the DEIMOS science CCD controller analog power. To power down the DEIMOS science CCD controller, use either:

   	powerdown

   or

   	powerdown deiccd

   To power down the DEIMOS FCS CCD controller, use:

   	powerdown deifcs

   The script will ask you to confirm that you REALLY want to power down the DEIMOS science (deiccd) CCD controller. Answer either yes or YES and then hit the RETURN key.

   This command should, after a delay of about 40 seconds, cause the analog switches in the dewar electronics to open up (thus electrically isolating the CCD mosaic inside the dewar from the outside world) and then cause analog power (+35 volts, +16 volts, and -16 volts) to be removed from the backplane of the DEIMOS science CCD controller.

   This command takes about 1 minute to complete. When it is done, it will either confirm that the analog power down sequence was successful, or it will tell you why it was not. If the powerdown command did not succeed, then contact the DEIMOS instrument team in Santa Cruz for troubleshooting assistance.

Transcripts

Science CCD System

Here is a transcript of a successful completion of the DEIMOS powerdown command on the science CCD crate:

FCS CCD System

Here is a transcript of a successful completion of the DEIMOS powerdown command on the FCS CCD crate:

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Last modified: Tue Sep 29 14:47:19 HST 2009