Mode (mosaic command) | Chip Numbers Used | Binning Value | Raster Value | Field Size | Readout/Write Time |
---|---|---|---|---|---|
lfc / lfc2 | 0, 1, 2, 3, 4, 5 | 1 x 1 | No Raster | 24.5' x 24.5' | 115 seconds |
lfc2bin | 0, 1, 2, 3, 4, 5 | 2 x 2 | No Raster | 24.5' x 24.5' | 56 seconds |
lfcfour | 0, 1, 2, 3 (central 4) | 1 x 1 | No Raster | 12.3' x 24.5' | 111 seconds |
lfczero | 0 (chip 0) | 1 x 1 | No Raster | 6' x 12.3' | 105 seconds |
lfczerobin | 0 (chip 0) | 2 x 2 | No Raster | 6' x 12.3' | 45 seconds |
lfcfind | 0 (chip 0) | 2 x 2 | [0 - 1024   x   0 - 1024] | 3' x 3' | 31 seconds |
Specifically, this the FITS header parameter BZERO is set to 32768, and the image is written as a FITS-standard 16-bit integer data file. IRAF et al. use the value of BZERO in the FITS header to restore the pixel values to those provided by the camera.
By contrast, the old "not IRAF" format images stored pixel data as
unsigned 16-bit integers, resulting in a non-standard FITS format image
(a "ushort" image in IRAF parlance) that most FITS readers cannot read
without special handling.
General shutter status and configuration is accomplished via the shutter command. The supported
subcommands:
Utility board status: +40 V at +34.4 CCD temp at -391.6 +15 V at +16.1 CCD set temp at -391.6 -15 V at -15.8 Electronics temp at +25.8 +5 V at +5.1 % overcharge 2%The temperature inside the electronics box is 25 C. We do not use the utility board for temperature control, so that part of the display is not useful.