32
•
Falcon 4 Camera User's Manual
Camera Operation
External Frame Rate, Programmable Exposure Time
In this mode, the frame rate is set externally with the falling edge of EXSYNC generating the rising
edge of a programmable exposure time.
Camera Features:
•
TriggerMode = On
•
ExposureMode = Timed
•
ExposureTime = 10000 (for example)
Figure 12: External Frame Rate, Programmable Exposure Time
Exposure Time
Exposure time is the amount of time that the sensor is allowed to accumulate charge before being
read. The user can set the exposure time when the ExposureMode feature is set to Timed. The
limitations on the maximum exposure time are listed below:
•
External Exposure Time: 100 µs (min) to 1 second (max).
•
Internal Exposure Time: (1 / frame rate) *0.95
Note: The maximum exposure time is dependent on the frame rate. To increase maximum
exposure time, decrease the frame rate.
Trigger Modes
The camera’s image exposures are initiated by a trigger signal. The trigger event is either a
programmable internal signal used in free running mode, an external input used for synchronizing
exposures to external triggers, or a programmed function call message by the controlling computer.
These triggering modes are described below.
•
Free running (trigger disabled): The camera free-running mode has a programmable
internal timer for frame rate and a programmable exposure period.
•
External trigger: Exposures are controlled by an external trigger signal. The external trigger
signal can be either a Camera Link HS trigger message or a general purpose input (e.g.
Frame Time
Frame Time
Readout Time
Exposure Time
Programmable
User Exsync
FVAL
Exposure Time
Programmable
Internally-generated Exsync
Preliminary
