Matrix Vision mvBlueFOX3 Technical Manual page 77

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If an external trigger signal occurs (e.g. high or low), the sensor will start to expose and readout one image. Now, if
the trigger signal is still available, the sensor will start to expose and readout the next image (see figure 12, upper
part). This will lead to an acquisition just like using continuous trigger.
If you want to avoid this effect, you have to adjust the trigger signal. As you can see in figure 3 (lower part), the
possible period is small.
10.3.1.2.2 Example
External synchronized image acquisition (high active)
• Trigger modes
– OnHighLevel:
The high level of the trigger has to be shorter than the frame time. In this case, the sensor will make
one image exactly. If the high time is longer, there will be images with the possible frequency of the
sensor as long as the high level takes. The first image will start with the low-high edge of the signal.
The integration time of the exposure register will be used.
– OnLowLevel:
The first image will start with the high-low edge of the signal.
Figure 3: External Trigger with CMOS sensors
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