SWIR Acuros CQD Series, User Manual, Page: 36 / 121

User Manual
Acuros
®
CQD
®
Camera
36 | P a g e
7.9 TriggerMode
Image capture is triggered in three way, internal, external,
and external PWM, and is set using the TriggerMode pull
down menu.
7.9.1 Internal Trigger
Internal trigger is used by the CSV export feature and uses the exposure time set in the user
interface. Export PNG does not activate a trigger since the video must be stopped before export.
The internal trigger delay has a sub-nanosecond jitter.
7.9.2 External Trigger
An external trigger signal input connection is available at the BNC connector attached to the
Hirose power cable shown in Section 6.1 . This trigger input accepts signals from 0V to a 5.5V
maximum. The thresholds for the trigger input are 0.8V for logic low and 2.0V for logic high. The
trigger input presents a 10K ohm load to ground to the signal driving source.
Two different trigger modes are offered with different exposure control mechanisms: external
trigger uses the exposure time set in the user interface and external PWM uses the exposure time
from the PWM input.
1. As shown in the first figure below, the trigger pulse width is a minimum of 1us. The
exposure time here is determined by the Set Exposure Time field in the software
interface. The trigger pulse input can be used to control the trigger period from the
minimum frame time allowed. The minimum trigger period varies with camera format
and windowing settings. More information on minimum frame time can be found in
Section 7.3 .
Figure 27: Trigger timing diagram
2. Pulse width modulated (PWM) trigger uses an externally generated pulse to determine
the frame exposure time. The exposure time governed by the time between the rising
edge and falling edge of the trigger pulse and has an associated trigger delay and
uncertainly (jitter). The trigger period is determined by the time between the first trigger’s
Figure 26: SVS ImagIR Trigger Mode Menu