Trigger And Strobe; Introduction; Trigger Source - Photon Focus MV1-D1280 Series User Manual

5 Functionality
Sequential Read out Timing
The camera supports only the sequential read out timing. It means the exposure is started after
the read out of the previous frame (see Fig. 5.9).
The maximal frame rate is in this case (values are given in Table 5.5):
MaxFrameRate = 1 / (ExposureTime + TReadoutDel + ReadoutTime)
The ReadoutTime is the height of the ROI multiplied by the read out time of one row (see
Table 5.5).
F r a m e < n > F r a m e < n + 1 >
6 r i g g e r
- x p o s u r e T i m e
E x p o s u r e
R e a d o u t
T R e a d o u t D e l R e a d o u t T i m e
Figure 5.9: Sequential read out timing

5.2 Trigger and Strobe

5.2.1 Introduction

The start of the exposure of the camera's image sensor is controlled by the trigger. The trigger
can either be generated internally by the camera (free running trigger mode), by a software
commen (Software Trigger) or by an external device (external trigger mode).
This section refers to the external trigger mode if not otherwise specified.
In external trigger mode, the trigger can be applied by the camera internal PLC block or
directly by the power supply connector of the camera (Line1 Trigger) (see Section 5.2.2). The
trigger signal can be configured to be active high or active low. When the frequency of the
incoming triggers is higher than the maximal frame rate of the current camera settings, then
some trigger pulses will be missed. A missed trigger counter counts these events. This counter
can be read out by the user.
An external trigger pulse starts the exposure of one image. The camera provides also a burst
mode. In in this mode, one trigger pulse starts a sequence of internal triggers and exposures.
The number of these internal triggers can be configured. (see Section 5.2.6).
The start of the exposure is shortly after the active edge of the incoming trigger. An additional
trigger delay can be applied that delays the start of the exposure by a user defined time (see
Section 5.2.5). This is often used to start the exposure after the trigger to a flash lighting
source.

5.2.2 Trigger Source

The trigger signal can be configured to be active high or active low by the TriggerActivation
(category AcquisitionControl) property. One of the following trigger sources can be used:
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