IL3 User’s Guide
page 66
11S-3002B
Referring back to Example 2 in the beginning of this section:
•
The TS3 is Recording the machinery running normally. It may be running for hours before anything
interesting happens.
•
The machinery has a problem.
•
A signal is sent in reaction to the problem.
In this case, the camera needs to record the seconds before and after the problem is detected. The
TS3 has the perfect trigger setting for this. The 50% Trigger divides the image capture into two halves,
the images just before the trigger is received (
pre-trigger frames
), and the images immediately after
the trigger is received (
post-trigger frames
).
Using the
50% Trigger
the TS3 fills the circular buffer until it gets the trigger. For the example here,
there is a good chance it will be getting the trigger signal directly from the machinery to its Sync I/O
connector, but it would work as well, triggered manually by a patient human.
When the TS3 is triggered, it keeps recording until it has captured the 1/2 the buffer’s worth of post-
trigger frames. The buffer now has a number of pre-trigger frames with negative frame numbers,
frame “0” and post-trigger frames with positive numbers. When played, the video on the below left
begins with frame #-9 and ends with frame #10.
If the camera is triggered before it has captured its full allotment of pre-trigger frames, it will still
record 1/2 the buffer in post-trigger frames and stop. The video on the right begins with frame #-5 and
ends with frame #10.
8
7
4
5
3
6
2
1
0
9
-1
-2
-3
-
4
-5
-
6
-7
-8
-9
10
Stop
Trigger Frame
8
7
4
5
3
6
2
1
0
9
-1
-2
-3
-
4
-5
10
Stop
Trigger Frame
Figure 7-8:
Circular Buffer End Trigger
Содержание IL3
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Страница 71: ...IL3 User s Guide 11S 3002B page 63 Figure 7 4 High Mid and Low 8 Bits of the same Image...
Страница 102: ...IL3 User s Guide page 94 11S 3002B Appendix J Physical Measurements Figure 8 10 Physical Measurements...
