Princeton Instruments ProEM+ EMCCD, Руководство пользователя

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82 ProEM
®
+ System Manual Version 1.B
Notes:
1. Kinetics mode-Single trigger is not a valid option for Bulb Trigger mode.
2.
“Continuous Clean” is only executed on the first trigger in a sequence. The
subsequent triggers will not run the Continuous Clean Programmed pattern.
Figure 45. Bulb Trigger {Expose During Trigger Pulse} Timing Diagram: Non-Overlap
Mode, Three Exposure Sequence,
No Preopen, No Continuous Cleans
Trigger Start {Start On Single Trigger}
In this mode, the camera requires only one trigger to acquire a sequence of frames. Once
the initial trigger is received, the camera ignores any further triggers until the entire
exposure/readout sequence is completed.
Fast and Safe Modes
Introduction
The ProEM+ has been designed to allow the greatest possible flexibility when
synchronizing data collection with an experiment. The fundamental difference between
the Fast and Safe modes is how often the acquisition start and acquisition stop commands
are sent by the computer for a data collection sequence. With Safe Mode, the computer
sends a start and a stop command for
each frame of a data sequence. With Fast Mode,
the computer sends only one start and one stop command for each data sequence . Once
the start command is sent, the selected timing mode and the shutter condition determine
when charge will be allowed to fall on the CCD array.
In WinX, the choice of Fast or the Safe data collection is made on the Experiment
Setup|Timing tab. The flowcharts in Figure 46 show the differences between the two
modes. In LightField,
Fast
data collections is always used.
Fast Mode (WinX and LightField)
In Fast operation, the ProEM+ runs according to the timing of the experiment, with no
interruptions from the computer. Fast operation is primarily for collecting "real-time"
sequences of experimental data, where timing is critical and events cannot be missed.
Once the ProEM+ is sent the start command by the computer, all frames are collected
without further intervention from the computer. The advantage of this timing mode is that
timing is controlled completely through hardware. A drawback to this mode is that the
computer will only display frames when it is not performing other tasks. Image display
has a lower priority, so the image on the screen may lag several images behind. A second