Ultra Start KE-6 Specifications download pdf (Page 70)

Version 1.1 rev Jan 2013

Page 70

iXon Ultra

, Features and Functionality

3.5.2 - Triggering options in Non-Frame Transfer (NFT) mode

3.5.2.1 - Internal (NFT)

When the camera is idle, i.e. not actively capturing images, it is repeatedly running the Idle Keep Clean Cycle. When the

Start command is received from the PC, the camera will complete the current Keep Clean Cycle, and then perform

sufcient vertical shifts to ensure the Image and Storage regions are completely free of charge. The camera is now

ready to start the real exposure sequence.

The timing sequence is illustrated in the gure below. During the exposure the Fire output will be high and there will be no

vertical clocking. However, the horizontal register will keep running. At the completion of the exposure time the FIRE pulse

will go low and the Image area of the EMCCD will be shifted into the Storage area. As the acquired signal is now safely

placed in the masked off region of the EMCCD, light still falling on the EMCCD will not contaminate the acquired image

while it is being read out. On completion of the readout the camera will perform the Internal Keep Clean Cycle until the

user specied cycle time has elapsed. This process is continued until the complete series of acquisitions has taken place.

Figure 28: Internal Trigger in Non-Frame Transfer mode

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Ultra Start KE-6 Specifications Page 70