290Alvium USB Cameras User Guide V4.6.1
Triggering and timings
Ignored triggers
Alvium 1800 U-500m/c, U-501m NIR, U-1240 m/c, and U-2050m/c
Changing parameters while acquisition is active leads to ignored triggers until the
parameters get active.
No Conditions Results
1 Exposure time is shorter than readout time. Trigger 1 starts exposure 1 with a delay
2 Exposure time is shorter than readout time, but
longer than for exposure 1.
Trigger 2 starts exposure 2 with a delay shorter
than for exposure 1.
3 Exposure time is longer than readout time Trigger 3 starts exposure time without a delay.
Because the exposure area is longer, also the
readout area is longer than for triggers 1 and 2
4 Exposure area is ongoing. Trigger 4 is ignored.
5 Readout area is ongoing Trigger 5 is ignored.
6 Readout area is finished. Exposure time is
longer than readout time.
Trigger 6 starts exposure 6 without a delay
Table 151: Triggering conditions and results
TriggerSelector values for rolling shutter (RS) cameras
Cameras with rolling shutter (RS) can be triggered using
AcquistionStart,
AcquisitionEnd, or FrameStart for TriggerSelector.
Cameras with rolling shutter (RS) cannot be triggered using
ExposureStart or
ExposureEnd for TriggerSelector.
Frame rates in triggered mode
When rolling shutter cameras are operated in triggered mode, the values for
maximum frame rate reached in free run mode are cut in half.
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