Advantech AIIS-1882, User Manual

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19 AIIS-1882 User Manual
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3.3.2 Finite lighting output period
Extending the idea of the previous section, setting the output count would generate
the lighting with a specific period of time. For example, the PWM period is 10ms, gen -
erating a 100ms duration lighting should the output count be set to 10, so that
10ms*10 = 100ms. The table below is the matrix for reaching different lighting output
duration for given camera frame rates and expected intensity.
3.3.3 Strobe
In strobe applications, the lighting flashes in a short period with maximum intensity. It
uses single PWM period output to reach the maximum lighting intensity in a short
period. In this application, camera frame rate isn’t one of the constrains. The low
period could be any number, or kept to the shortest it can be, because the only thing
that affects the application is the high period. The table below lists some examples for
different settings and results.
* Low could be set to any figure, as long as it wouldn’t affect the cycle time.
Camera Frame
Rate (fps)
Frame Period
(ms)
PWM Period
(ms)
Intensity
(%)
High
(ms)
Low
(ms)
Output
Count
10 100 10 100% 10 0 0
10 100 10 50% 5 5 0
10 100 10 0% 0 10 0
500 2 0.2 100% 0.2 0 0
500 2 0.2 80% 0.16 0.04 0
500 2 0.2 0% 0 0.2 0
Camera
Frame Rate
(fps)
Frame
Period
(ms)
PWM
Period
(ms)
Lighting
Output
duration (ms)
Intensity
(%)
High
(ms)
Low
(ms)
Output
Count
10 100 10 100 100% 10 0 10
10 100 10 200 50% 5 5 20
10 100 10 500 0% 0 10 50
500 2 0.2 100 100% 0.2 0 500
500 2 0.2 200 80% 0.16 0.04 1000
500 2 0.2 500 0% 0 0.2 2500
Strobe Duration (ms)
High (ms) Low (ms)* Output Count
10 10 5 1
100 100 5 1
500 500 5 1