Teledyne ProEM Series, Системное руководство

Страница: 93 / 162

Chapter 6 Advanced Topics 93
Figure 6-5: Timing Diagram: WinX/32 Continuous Cleans
Figure 6-6: Timing Diagram: LightField Clean Until Trigger (CUT)
6.1.5 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.
Open Close Open Close Open Close
Open Close Open Close Open Close
Read Read Read
Shutter (Preopen)
Shutter (Normal)
Read Out
External Sync
(positive polarity shown)
4
4
11-
0126
_00
5
0
CUT CUT CUT
Clean
Cycle
Open Close Open Close Open Close
Shutter Timing Mode
(Normal)
Shutter Timing Mode
(Open Before Trigger)
Not Reading Out
External Sync
(negative polarity shown)
Open Close Open Close Open Close
First wait
and exposure
Data
stored
Data
stored
Data
stored
Second wait
and exposure
Third wait
and exposure
tw1 texp tc tR
44
11
-0
12
6_
0
0
51