User`s manual

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For example, if an SLS inspection application requires a
moving object to be measured at four places along its
length, but the object crosses the FOV in 5Oms, the SLS
would be able to acquire and process only two images
during that time, assuming an Object Width cycle time of
25ms.
However, by selecting the burst mode and specifying four
image acquisitions with 1Oms spacing, you can enable the
SLS to acquire four object width measurements, as shown
in Figure 5.7 on page 5-15.
After acquiring the fourth image, the SLS processes all four
images and sends the results data to its RS-232 port. The
CSS can store the results data on disk and/or use it for
monitoring or SPC operations.
Alternatively, other computer equipment can be connected
to the SLS and, when using the appropriate communication
software, can receive the results data and use it for process
control.
Note: Because of the indeterminate timing of the analog
and discrete outputs when the burst acquisition mode is in
use, only the RS-232 results should be used.
The burst acquisition mode can be configured using one of
the following methods:
1. Using one trigger to acquire a specified number of
images (2 to 9) having a specified interval (6ms to
25ms) between them, or
2. Using multiple triggers to acquire a specified number of
images (2 to 9), but without a specified interval.
In the second method, the SLS evaluates the time interval
between the first and second triggers and uses that as the
baseline for the measuring the intervals between the
remaining trigger pairs (#2 and #3, #3 and #4, and so on).
For example, if the SLS expects seven triggers, but the
interval between trigger #3 and trigger #4 exceeds twice the
interval between triggers #1 and #2, the SLS assumes that a
missed trigger has occurred. It then “times out,” processes
the images already acquired (#l, #2, and #3), sends them to
the PC, and then resets the burst count.
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