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INGRID overheads

Readout times
Measured readout time (s)
Window size Fast readout mode Slow readout mode
256x256 0.176 0.242
128x128 0.083 0.097
all frame 0.505 0.755

NOTE: The fast readout speed has not been commisioned yet.

Single-cycle time


The single-cycle time is the time taken to complete a single observation of the minimum exposure time without windowing (including all the overheads: readout, collecting headers, archiving...). This time varies between 3.7-4.4s (i.e. 'run ingrid 0.8' or 'run ingrid 0' takes 3.7-4.4s to give you the prompt back).

Filter changes


The table below shows the time (in seconds) needed to change the filters in INGRID using the command filter ingrid <filter name>. Note that the filter movements in some cases imply movements of more than one filter wheel, since each filter movements is tied to other filter movements and/or pupil stop (click here to see the filter/pupil stop combinations).
Final position


K Ks H J blanks
Initial
position
 K -- 20 38 55 100
Ks not measured -- 47 64 not measured
H 37 46 -- 38 82
J 58 64 38 -- 66
blank 99 108 82 62 --

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Last Updated: 30 January 2008
Ian Skillen, wji@ing.iac.es