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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 (including all the overheads: readout, collecting headers, archiving...). This time varies between 4.5-5.1s (i.e. 'run ingrid 0.8' or 'run ingrid 0' takes 4.5-5.1s 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 -- 17.3 33.3 40.3 Not measured
Ks 15.3 -- 41.4 48.4 107.5
H 33.2 41.3 -- 15.2 Not measured
J 41.3 49.3 17.2 -- Not measured
blank Not measured Not measured Not measured 78.5 --

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Last Updated: 28 December 2001
Almudena Zurita azurita@ing.iac.es