A Schematic Example

In general, a single observation of a source brighter than 0.6 Jy will become a concatenated chain of 3 observations. For example, the sequence:

1. slew to source
   
2. (A) CAMO4 (target)
   
3. slew to next target
   

1. slew to off-source position
   
2. (B) Dummy AOT, DRK flag = 19 (suppresses return to parallel mode). Not that here, the camera should be configured in the first configuration of the next AOT, since skipping the initial sequence also skips the camera setup commands. In this example one should select the CVF with the wavelength corresponding to the start of the intended scan
   
3. slew to target
   
4. (A) CAM04, DRK flag = 29 (ISOCAM start in the configuration set at AOT (B) and ends in the configuration it reaches at the end of this AOT)
   
5. slew to off-source position
   
6. (C) Dummy AOT, DRK flag = 20 (returns ISOCAM into parallel mode). Here the first configuration of this AOT has to be the last one of AOT (A).
   
7. slew to next target
   

Notes:

• This must be done as a concatenated chain.
  
• Use of DRK=20 in AOT (C) saves instrument set-up overheads ( 20s)
  The observing time penalty of adding dummy pointings is partially offset by 20s by bypassing the mode changes in the flanking AOTs.
  
• The AOT (A) (concatenated AOT with DRK=29) setup can be repeated indefinitely for a concatenated chain of observations to maintain a fixed configuration and thus minimize transients.