Using Trigger and Digital I/Os - Part 2

Published on June 3, 2008

Please Note: This blog post is part of a series of five posts altogether.
The posts include: Part 1, Part 2, Part 3, Part 4 and Part 5.

Trigger input - Hardware

The trigger input of The Imaging Source USB and FireWire CCD cameras is opto-coupled. It permits positive trigger pulses with any amplitude between 3.3 V and 12 V. If you intend to apply higher pulses, please make sure that the current lies in the range of 3 mA to 12 mA.

Trigger input - Exposure & Image Readout Timing

The Imaging Source USB and FireWire CCD cameras offer two different modes of operation:

Free running: The cameras generate a stream of up to 60 images/s depending on their resolution. To considerably reduce the amount of data, the frame rates may be reduced to 30, 15, 7.5 or 3.75 images/s. The exposure length is software adjustable in the range of 100 μs to 30 s. Please note, however, that the camera's clock generator determines the actual moment of exposure. Thus, it is not controllable externally, but measurable using the strobe output. Therefore, this mode of operation is called "free running".

Trigger: The cameras offer a trigger input to determine the moment of exposure. The exposure begins 4.8 μs after the occurrence of a trigger pulse. The exposure length is software adjustable from 100 μs to 30 s. The duration of the image readout is the reciprocal of the current frame rate. Once the image readout has finished, the camera is able to accept a new trigger pulse at any time.

To be continued...

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Post published by TIS Marketing on June 3, 2008.

About The Imaging Source

Established in 1990, The Imaging Source is one of the leading manufacturers of industrial cameras, frame grabbers and video converters for production automation, quality assurance, logistics, medicine, science and security.

Our comprehensive range of cameras with USB 3.1, USB 3.0, USB 2.0, GigE interfaces and other innovative machine vision products are renowned for their high quality and ability to meet the performance requirements of demanding applications.

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