Specifications
42
Alvium G1 User Guide V1.1.1
Exposure time and frame rates
Specified values
Stated values were calculated (see
Operation for maximum frame rates
).
Not all values were confirmed by testing. Minor deviations may occur.
Factors for exposure time and frame rates
• The
default bandwidth
for Alvium G1 cameras is 115 MBps. For some models,
you can achieve higher frame rates by increasing values for
DeviceLinkThroughputLimit
Operating systems and bandwidth
• Available values and increments for
exposure time
depend on other controls,
such as
DeviceLinkThroughputLimit
• For
delays
Exposure start delay = exposure area – exposure time.
• Calculation of maximum
frame rates for different ROIs
for Alvium G1 cameras
does not allow to give a formula.
Operation for maximum frame rates
43 defines the conditions for measuring ROI frame rates.
Sensor ADC readout modes for maximum frame rates
If you are using pixel formats that do not require 12-bit sensor ADC readout and
you want to achieve higher frame rates, you can select between readout modes for
12-bit, 10-bit, and 8-bit with some Alvium G1 camera models. See your model’s
specifications.
By default, Alvium G1 models use the maximum bit depth for
SensorBitdepth
.
For selected models,
Adaptive
mode switches automatically between 12-bit and
10-bit sensor ADC readout, depending on the bit depth of the selected pixel
format. This allows to reduce bandwidth and increase frame rates when only 10-bit
is required.
To enable the 8-bit sensor readout mode, you must switch manually, using
SensorBitdepth
. Please observe that the image brightness changes when you
switch between 8-bit sensor ADC readout mode and the other readout modes.
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