CV-A1-20
6.4. External Trigger Modes
This camera has 6 external asynchronous trigger modes, which can be set by
1. | Edge |
2.Pulse Width Control Mode. TR=2 Pulse width controlled exposure. (HC=0, HC=1)
3.Frame Delay read out mode. TR=3 PWC exposure read out by ext. VD. (HC=0, HC=1)
4.Long Time Exposure Mode. TR=4 Exposure is interval between ext. VD.
5. | Start/stop Mode. TR=5 | Exposure start by trigger and stop by ext. VD |
6.Smearless Read out mode. TR=6
The default accumulation is HD synchronously accumulation (HC=0). The accumulation starts at the first HD after the trigger leading edge. Fig. 18. To avoid the <1H jitter caused by this delay, synchronize the external trigger to HD as shown in fig. 17 below. The trigger level translations should be placed inside the 8 + 4 ∝seconds.
In PWC mode (TR =2) and Frame Delay readout (TR=3), the accumulation mode HC can be set to asynchronous accumulation (HC=1). The exposure will start immediately at the leading edge of the trigger pulse without waiting for the HD. Fig. 19. below.
In Edge
8∝ s | 4∝ s | 8∝ s | 4∝ s |
Ext. HD
TRIG
>1H
Fig. 17. Trigger/HD Timing.
t1 | t2 | t3 | t4 | t5 |
HD
Trigger
Accum
Xsub
Xsg
EEN
Fig.18. Pulse Width H Synchronous Accumulation
t1 | t2 | t3 | t4 |
HD
Trigger
Accum
Xsub
Xsg
EEN
Fig. 19. Pulse Width H Asynchronous Accumulation.
Note: Xsg and Xsub are internal signals in the camera. They are shown in the timing diagram for better understanding.
- 10 -
