Princeton Instruments ProEM+ EMCCD, User Manual

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Chapter 6 Advanced Topics 81
81
Figure 43. WinX Continuous Cleans Timing Diagram
Figure 44. LightField Clean Until Trigger (CUT) Timing Diagram
Bulb Trigger {Expose During Trigger Pulse} Timing
When Bulb Trigger {Expose During Trigger Pulse} timing is selected, the camera
exposure is set by the External Sync input at the EXT SYNC connector. This allows an
external timing generator to control the exposure time of the camera.
In Full Frame, Frame Transfer, Kinetics, and Spectra-Kinetics modes, the transition from the
inactive state to the active state of the External Sync at the EXT SYNC connector starts the
exposure; and the transition from the active state to the inactive state ends the Expose.
When the camera is ready to accept the external sync through the EXT SYNC connector,
the Wait for Trigger {Waiting For Trigger} (WFT) signal at the LOGIC OUT connector
is high (if WFT is the selected output signal): WFT goes HIGH immediately after readout
(or after preopen if it is active). It goes LOW when an active edge (+ or – edge depending
on your setting) occurs and, if Continuous Cleans {Clean Until Trigger} is not enabled,
the exposure begins. If continuous cleans is enabled, the camera will check for an active
edge at the EXT SYNC connector before entering a continuous clean cycle. If none has
occurred, a cycle will begin and complete. The EXT SYNC connector is checked again to
see if an active edge has occurred and exposure will begin if it has.
In Kinetics mode-Multiple Trigger {Shift Per Trigger}, the first exposure is the same as
described above. The subsequent exposures really start when WFT on the LOGIC OUT
connector goes high. The External Sync on the EXT SYNC connector must then
transition to the active state. The exposure will end when the External Sync transitions
back to the inactive state.