Synchronous Readout Trigger Mode - Hamamatsu Photonics C11440-10C Instruction Manual

C11440-10C Ver.1.2
9-5-2-2 Global exposure level trigger mode
The global exposure level trigger mode is used to take a snapshot of a moving object with a
pulsed light source or get a momentarily illuminated event. The exposure time can be set by
software command. In this mode, the camera combines the frames right before and after the
global exposure trigger signal (falling/rising edge) into one frame and output them as one frame
of data. The exposure is finished when the trigger signal becomes inactive (falling/rising edge).
Minimum value of exposure time setting is about 22 ms (1 frame readout time).
9-5-3

SYNCHRONOUS READOUT TRIGGER MODE

The synchronous readout trigger mode is used for continuous imaging when it is necessary to
control the exposure start timing of each frame from an external source. It is useful for confocal
microscopy. For example, when the camera is used with a spinning disk confocal microscope
and the camera exposure time is synchronized to the spinning disk's rotation speed, it is possible
to eliminate uneven illumination (called banding noise) caused by variation of the spinning disk
rotation speed. Also, it is useful for securing as long an exposure time as possible while
controlling the exposure start timings by external trigger signals.
9-5-3-1 Normal synchronous readout trigger mode
The normal synchronous readout trigger mode is used for continuous imaging when it is
necessary to control the exposure start timing of each frame from an outside source and also
when it is necessary to secure as long an exposure time as possible. In the synchronous readout
trigger mode, the camera ends each exposure, starts the readout and also, at the same time,
starts the next exposure at the edge of the input trigger signal (rising /falling edge). That is, the
interval between the same edges of the input trigger becomes the exposure time.
20
Figure 9-8