Dalsa 4M30 User Manual

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Dalsa 4M30 User Manual Manual pdf 34 page image

Falcon 4M Camera Manual03-032-20044-01 DALSA34Snapshot ModeThe Falcon 4M60 and Falcon 4M30 cameras include a feature called Snapshot Mode.Snapshot Modes 1 and 2 allow the camera to produce usable images when intervalsbetween EXSYNCs are large (>200 ms).Previously only snapshot mode 0 was available (no fast frame dump) which wouldeventually result in a completely saturated ‘first’ image after a very long EXSYNC idleperiod (seconds), as shown below.First Frame Elevated Offset - efd 0sem 4, External EXSYNC and exposure (smart EXSYNC)By altering the internal timing, Snapshot Mode 1 performs a fast clearing of a frameconcurrently with integration. Thus, any dark current that caused elevated dark offsetlevels, FPN or hot pixels, is cleared from the sensor prior to readout. The end result is thatthe camera produces a usable first image.With Snapshot Mode 1, please note that the timing of EXSYNC with respect to theintegration time has changed. The figure below illustrates Snapshot Mode 1 timing. Thedifference is that the Integration Time, Z, is now equal to the EXSYNC high time, X, plusthe time it takes to clear the image, Y (plus 3.1 us of additional overhead). The total timeto clear the frame is Y (approximately 500 us). Therefore, the minimum integration timein Snapshot Mode 1 is Y + 3.1 us. The exact value of Y is listed in the gcp screen as DUMPTIME.