FRMDIVSR

Divisor applied to frame-averaged groups

The FRMDIVSR keyword records the value of the frame divisor used on-board when the flight software averages multiple frames (detector readouts) into a single group. The on-board process works by first summing the data from NFRAMES readouts and then dividing by the frame divisor to form an average. The frame divisor value is equal to NFRAMES for most readout patterns, but not always. When they are not equal, the frame-averaged data values end up with a different scaling than the original data values.

Attribute Value
data type integer
enumerated Values not defined
units
example 5
default value
special processing VALUE_REQUIRED
source Science and Operations Center Project Reference Database (PRD)
software source
calculation Datamode table lookup:FRAMEDIVISOR
DB destination ['ScienceCommon.frmdivsr']
data type in DB tinyint
instrument Multiple
mode All
product level 1b
FITS hdu PRIMARY
FITS header section Exposure