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Pausing and stopping exposures

There is a set of commands for changing the course of an exposure. These commands are non-queuing and execute as soon as you enter them.

If you need to pause and then restart a CCD exposure, do so using the following commands:

ICL> pause blue
   ICL> continue blue

If you need either to abort a CCD exposure or stop it before the pre-set exposure time has elapsed, do so using one of the following commands:

ICL> abort blue
   ICL> finish blue
Finish saves the data, but abort throws the data away.

Abort is a general command for stopping DAS actions. Abort <channel> is a short form for the option abort <channel> exp which stops any exposure that is active and cancels the saving of the data of those exposures only (if the system still has unsaved data from previous observations it will save these data despite the abort).

In a multrun, abort cancels all exposures in the seqyuence that have not yet begun.

In similar circumstances, finish only truncates the exposure currently in progress. To truncate a sequence, use the killmultrun command, which cancels the pending exposures, followed by finish to stop the exposure in progress. You can, of course, give the killmultrun command and let the current exposure complete normally.

The command newtime sets a new exposure time for an observation:

ICL> newtime aux 1000
changes the exposure time on the Aux channel to 1000 seconds. If you specify a time less than that already exposed the effect is like finish. If you use newtime during a sequence of exposures that were queued by a single command ( multrun or similar), then newtime affects all of them. Conversely, if you have a queue of exposures generated by separate commands, newtime only affects the one currently executing.



Previous: Quick-look and instrument set-up
Up: Using the DAS
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Previous Page: Quick-look and instrument set-up
Next Page: Interactive exposures


Mon Oct 3 21:59:29 WET 1994