69Alvium USB Cameras User Guide V4.6.1
Specifications
Exposure time behavior regarding ExposureMode
This section informs about how exposure time behaves in the different exposure
modes.
All Alvium cameras have an exposure time offset. The exposure time offset and the
exposure time increment depend on sensor and camera characteristics. Both, the
exposure time offset and the exposure time increment, can change if
Width,
PixelFormat, or DeviceLinkThroughputLimit are changed. See Value changes
by feature interdependencies on page 301.
ExposureMode = Timed
For all Alvium cameras, exposure time can be set by ExposureTime or
ExposureAuto. For this, ExposureMode is set to Timed.
The selected exposure time is extended automatically:
• If the selected exposure time does not match the available increment, the
camera automatically extends the exposure time to the next increment.
• The exposure time offset is included in the selected exposure time.
ExposureMode = TriggerWidth or TriggerControlled
In addition, most global shutter (GS) cameras can control exposure time by the
trigger signal, with the
ExposureMode set to TriggerWidth or
TriggerControlled (using ExposureStart and ExposureStop).
The trigger controlled exposure time is extended automatically:
• If the trigger controlled exposure time does not match the available increment,
the camera automatically extends the exposure time to the next increment.
• Subsequently, the exposure time offset is added.
You can use
ExposureActive to determine the duration of the exposure time
offset.
Operation for maximum frame rates
Values for maximum frame rates and for minimum and maximum exposure time in
the specification tables are based on following parameters:
• Factory settings (camera after power up)
• Minimum exposure time
• Full resolution
• Mono8 pixel format or 8-Bit Bayer pixel format
• Camera operation in freerun mode
• Minimum value for
SensorBitDepth (8-bit sensor ADC readout mode if
available)
• Bandwidth required for the corresponding frame rate, as stated in the tables
for ROI frame rates.
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