RM/TM-4200GE Series
24
Operation
When n=0, the exposure time is the minimum exposure time. It is equal to:
In this mode the maximum exposure time is equal to the setting for one frame. If the user specified exposure
time is longer than the time allowed for one frame, it will be ignored by the camera.
3.3.3
Asynchronous No Shutter Mode
In Asynchronous No Shutter Mode, applying the external trigger starts a camera scan reset. The camera finishes
the line it is scanning and scans an additional 9 video lines, this charge is sent to the horizontal register.
Because the external trigger is randomly applied, the new image charge may overlap with the previous image.
To prevent an existing charge accumulation from interfering with a new image, most users set up the
application in a dark area and depend on a strobe light for illumination. From the time the external trigger
activates until the transfer gate turns off, about 9.5 video lines are available for integration; if everything is
properly configured, the strobe flashes during this time.
Figure 16.
External Trigger Timing.