Mikrotron eosens TS3, Руководство пользователя, Страница: 108 / 120

TS3 User Manual
11S-3000M
page 99
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
t o the problem.
In this case, the camera needs to record the seconds before and a ft er the problem is detected. The
TS3 has the perfect trigger setting f or 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 a ft er the trigger is received ( post-trigger frames ).
Using the 50% Trigger the TS3 fills the ci r cular bu ff er until it s ets the trigger. For the example
here, there is a good chance it will be getting the tr ig ger signal directly from the machinery to its
Sync I/O connector, but it would work as well, triggered manually by a patie n t human.
When the TS3 is triggered, it keeps recording until it has c aptured the 1/2 the bu ff er’s worth of
post-trigger frames. The bu ff er now has a number of pre-trigger frames with negati v e frame
numbers, frame “0” and post-trigger frames with positi v e 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 bu ff er 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 10-8: Circular Buffer End Trigger