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Alvium USB Cameras User Guide V3.3.0
Triggering
Trigger latency
In theory, a trigger creates an immediate response of the camera, depending on
the cable length. In practice, the computer may add a delay that is mostly
unpredictable, especially on Windows systems. In addition, camera electronics and
sensors have a delay.
Rolling shutter (RS) cameras in this document also have exposure delay, depending
on camera settings, see
Triggering with rolling shutter cameras
Trigger features and UserSetDefault
Trigger features are reset to default values when the default user set is loaded.
•
Column
UserSetLoad
displays how user values are affected when the
command for
UserSetLoad
is executed.
•
Column
DeviceReset
displays how user values are affected when the
command for
DeviceReset
is executed.
Triggering with rolling shutter cameras
This section describes triggering behavior for
1800 U-500m/c, U-501m NIR,
U-1240m/c, and U-2050m/c
.
shows how an external signal triggers
exposure and readout for cameras with rolling shutter (RS) sensors. Like for global
shutter (GS) sensors, readout has a constant duration, acquisition must be active
to enable exposure, the end of exposure starts readout.
Rolling shutter (RS) sensors run in cycles where
readout area
equals
exposure area
.
Overlapping triggering is not supported. If exposure time is shorter than readout
time, exposure starts with a delay:
Feature
Default value
UserSetDefault DeviceReset
TriggerActivation
RisingEdge
Default value
Default value
TriggerMode
Off
Default value
Default value
TriggerSelector
AcquisitionStart
User value
Default value
TriggerSoftware
[Command]
Not applicable
Not applicable
TriggerSource
Software
Default value
Default value
Table 91: Trigger features being reset
