JAI LT-200CL User Manual

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JAI LT-200CL User Manual Manual pdf 25 page image

LT-200CL246.4.1 No-shutter mode with internal triggerIn this mode the camera does not accept an external trigger signal, as the line rate isgenerated from an internal clock (user programmable, command LR). The exposure timeis directly proportional to the line rate . This mode is used when there is no externaltrigger signal available, and the speed of the object is fixed or can be pre-determined.The line rate can be varied from 32.9125μs to 16.844ms in 1 clock (12.5ns) steps. Whenusing this mode, a special function called “one-push auto line rate” is available. Thismode automatically maintains a constant output level by changing the line rate. Seechapter 7 (configuring the camera) for further details on this function. The line rate isautomatically adjusted in order to maintain sensitivity without reducing the S/N ratio.To use this mode:Set function Trigger mode, No-shutter TR=0Trigger origin, internal TG=0Line rate LR=2633 to 1347584(32.9125μs to 16.844ms in 12.5nsincrements)Optional functions when using this mode:One-push auto line rate AR=0Auto line rate reference AL=0 to 1023One-push white balance WBImportant Note The “one-push auto line rate” function is not recommended for continuous webapplications, as the speed of motion needs to be adjustable in order to maintain theaspect ratio of the image. Only gain based one-push white balance functions (WB) are available with this mode.Fig.34 No-shutter / internal trigger mode