MCCD Spectroheliograms
The software does the following things when taking a
spectroheliogram:
- Check that the number of frames is <= 576
- Open the shutter
- Ask the observer which row (but is really column!) to do.
- Initialize the camera
- Close the shutter
- Write a bias to the ccd
- Move scanner to initial position
- poff = (selected column number - 1) * row length
- shgoff = 500000
- shgsize = #rows * #frames
- For #frames:
- clrims to ccd
- shutter open
- pause for exposure time
- shutter close
- move scanner to next position
- readout ccd
- "pdat poff + pdat shgoff + #rows wmove" to ccd.
This copies the selected column contents to a high area of the
ccd.
- shgoff += row length
- Reformat ccd to the SHG size (#rows by #frames)
- "pdat 500000 + pdat shgsize wmove pz qshow".
This copies the shg data in the high area of ccd memory
to cache 1, and displays it on the monitor.
- open shutter
- move scanner to center