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din cable and ensure that the pinouts are set correctly from your trigger source. Refer to Appendix A
for further details on pin assignments and a diagram of the mini-din connector.
There are several ways that you can provide an external pulse to the camera, one of them being via
the QImaging External Trigger Board, which is available through QImaging, and another common
device is a function generator. To trigger the camera, you need to provide a 5V TTL pulse though the
pin stated in Appendix A.
To ensure that you will use the external triggering mechanism correctly, it is important to ensure that
the following questions have been answered when devising or architecting your system design:
•
Has a system design been developed that incorporates the necessary elements such as:
•
a Timing Diagram,
•
Flow of Events (e.g. a simple state diagram),
•
necessary components (e.g. microscope, flash lamp, shutter etc),
•
a software solution for extracting and/or processing your images,
•
External Triggering source (e.g. QImaging Trigger board, function generator etc)
•
Have you Determined the type of triggering mode you require for you application.
•
Are you sure the settings in the camera have been set correctly. For instance, are your
monitoring the SYNCB output and if so have you set the correct output mode for your
system?
The above list should be used as a guide and should be consulted before contacting QImaging
Technical Support.
Gain and Offset Controls
The Intensified Retiga Fast 1394 has three controls that allow the user to optimize the range of the
camera's imaging elements to specific applications. The three controls are Optical Gain, Electrical
Gain, and Electrical Offset.
Image Amplifier Element
The optical gain element employed by the Intensified Retiga Fast 1394 is a Image Intensifier or
intensifier tube. The Image Intensifier tube is shown in Figure 13. The Intensified Retiga Fast 1394's
Image Intensifier tube provides high enough gain in the optical domain such that the Intensified Retiga
Fast 1394 can discern single photons incident on the Image Intensifier tube.
For a given exposure time and lighting condition, the optical gain is optimally set when the brightest
point of interest in the image almost saturates the CCD's electron wells. The optical gain of the
Intensified Retiga Fast 1394 is controlled in software by the Intensifier Gain control.
Содержание Intensified Retiga Fast 1394
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