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Do not trigger faster than the maximum frame rate. If a trigger occurs faster than the
maximum frame rate, such as the time between triggers being less than the minimum frame
period, the incoming trigger is ignored.
Software determines the maximum frame rate using the following equation:
max frame rate =
1
min frame period
where
min frame period
is the minimum amount of time for the current camera
configuration
Frame rate is the inverse of the frame period. The frame period is the time from the start of
exposure on one frame to the start of exposure on the next frame, as shown in the following
figure.
Figure 19.
Frame Period
Trigger
Exposure
Image Readout
1
1. Frame Period
The frame period is affected by the following factors:
•
Exposure Time and Exposure Delay attributes
•
Trigger Delay attribute
•
Image size, determined by the Width and Height attributes
•
Image decimation, determined by the Decimation Vertical and Decimation Horizontal
attributes
•
Image format, determined by the Pixel Format and Pixel Coding attributes
•
Trigger Overlap attribute
Related Information
on page 24
on page 25
on page 20
on page 21
Determining the Exposure Time
In general, a longer exposure time or exposure delay results in a longer frame period, and a
slower maximum frame rate, provided the trigger delay is not longer than the untriggered
minimum frame period.
ISC-178x User Manual
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© National Instruments
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