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C11440-36U Instruction Manual Ver.1.1
9-4-2
LEVEL TRIGGER MODE
Level trigger mode is used to control both exposure start timing and exposure time length by
inputting external trigger pulses. In the mode, the camera starts exposure at the start of high or
low period of the input trigger pulse and stops exposure at the end of high or low period of the
input trigger pulse. The example below is for the trigger level High. The exposure begins when
the trigger signal becomes High. The exposure is finished when the trigger signal becomes Low,
and signal readout is begun. The exposure time of each line is defined by the time that the level
of input trigger becomes High to Low.
External trigger
Exposure start signal
Sensor readout
Camera data output
Global exposure timing
Trigger ready output
•
Input pulse width should be subtracted 13.73 µs from the desired exposure time.
•
Jitter which is up to ±1H (≈ 12.4 µs) might be included in exposure time.
9-4-3
SYNCHRONOUS READOUT TRIGGER MODE
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 exposure time as possible while controlling
the exposure start timings by external trigger signals.
•
Input pulse width should be subtracted 13.73 µs from the desired Exposure time
•
Jitter which is up to ±1H (≈ 12.4 µs) might be included in exposure time
18
*1
0H
1H
2H
Exposure
・
・
(LAST-1)H
(LAST)H
output
*1 Delay + Jitter = 3H (≈ 37.3 µs) + up to 1H (≈ 12.4 µs)
*2 The memory standby time = 10H (≈ 124.4 µs)
Figure 9-5 Level trigger mode (Rising edge)
*2
Exposure
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