1. Exposure Control

Wavelength

The wavelength pull-down menu sets the wavelength band of the TRACE
instrument. Each of the selections corresponds to a particular configuration
of the rotating shutter and filter wheels. The first eight entries are
the standard baseline settings for scientific observation. The others should
only be used for special purposes and testing.

Exposure time

Exposure can either use an absolute exposure time or the Automatic Exposure
Control (AEC). For the AEC, either the default or last value can be used.

Only a specific set of absolute exposures are actually available. If
an arbitrary value is entered in the field, the exposure time nearest
the entered value will be used. To see the actual value, activate the
"scan entries" button under the file menu. This scans all the entries
and checks for consistency and replaces the entered exposure time
with the nearest available one.

When using AEC, you must specify whether to start with the default AEC
exposure or use the last one from a previous frame. more ....