SVS-Vistek evo1050 Operation Manual - page 37
5 interfacing and Timing | 30
5.1.3 Basic Info: External Trigger (Exposure Time)
External trigger with programmable exposure time. In this mode the
camera is waiting for an external trigger which starts integration but
exposure time is programmable via serial interface and calculated by
the internal microcontroller of the camera.
With each positive transition (going high) the camera will readout a
frame.
The enclosed software allows the user to set exposure time e.g. from 60
µsec 1Sec (camera type dependent).
Exposure time of the next image can overlap with the frame readout
of the actual image( trigger pulse occurs when FVAL is high). When
this happens the start of exposure time is synchronized to the negative
edge of the LVAL signal (see figure 7.1.3a)
When positive edge of trigger signal occurs after frame readout has ended
(FVAL is low) the start of exposure time is not synchronized to LVAL and
exposure time starts after a short and constant delay (see figure 7.1.3b).
Exposure time can be changed online during operation. No frame is
distorted during switching time. If the configuration is saved to EE-
PROM the exposure time set stays resident after power off.
External Trigger with Programmable Exposure Time (non overlap)
External Trigger
Data
Exposure Time 1
Frame 1
Frame 2
External Trigger with Programmable Exposure Time (overlap)
Ext. Trigger
Data
Exposure Time 1
Frame 1
Frame 2
Exposure Time 2
Exposure Time 2
External Trigger with Pro-
grammable Exposure Time
External Trigger with Programmable Exposure Time (non overlap)
External Trigger
Data
Exposure Time 1
Frame 1
Frame 2
External Trigger with Programmable Exposure Time (overlap)
Ext. Trigger
Data
Exposure Time 1
Frame 1
Frame 2
Exposure Time 2
Exposure Time 2
figure 7.1.3.a: External Trigger with Programma-
ble Exposure Time (overlap)
figure 7.1.3.a: External Trigger with Program-
mable Exposure Time (non overlap)