Teledyne Princeton Instruments NIRvana HS, Системное руководство

Страница: 76 / 107

76 NIRvana HS System Manual Issue 1.0
10.2.4 Expose During Trigger Pulse
When Expose During Trigger Pulse timing is selected, the camera exposure is
determined by the TRIGGER IN input on the camera (see
Figure 10-1 ) which allows an
external timing generator to control the exposure time for the camera.
The transition from the inactive state to the active state of the input at the TRIGGER IN
connector starts the exposure, while the transition from the active state to the inactive
state ends the exposure.
When the camera is ready to accept input through its external trigger connector, the
Waiting For Trigger (WFT) signal at the OUT 1/OUT 2 connector is high (if WFT is the
selected output signal): WFT goes HIGH immediately after readout (or after Open
Before Trigger if it is active). It goes LOW when an active edge (+ or – edge depending
on your setting) occurs and the exposure begins.
Figure 10-4 illustrates the timing diagram for Expose During Trigger Pulse mode with
the following configuration settings:
• Three exposure sequence;
• No Open Before Trigger.
Figure 10-4: Timing Diagram: Expose During Trigger Pulse
10.2.5 Start On Single Trigger
In this mode, the camera requires only one trigger to acquire a sequence of frames.
Once the initial trigger has been received, the camera ignores any additional triggers
until the entire exposure/readout sequence has been completed.
Waiting for Trigger
First Last
Exposing
Reading Out
Trigger In
44
11
-0
16
9
_
0
0
3
4