51
Alvium USB Cameras User Guide V3.6.4
Specifications
Exposure time and frame rates
Specified values
Stated values were calculated (see
Operation for maximum frame rates
), then
verified with the test setup described in
. Only a few minor deviations for
values below maximum resolution were identified.
Factors for exposure time and frame rates
• The
default bandwidth
for Alvium USB cameras is 200 MBps. For some
models, you can achieve higher frame rates by increasing values for
MaxTransferSize
and
DeviceLinkThroughputLimit
. See
• 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 USB
cameras does not allow to give a formula.
Operation for maximum frame rates
on page 53 defines the conditions for measuring ROI frame rates.
Component
Property
Desktop workstation Dell Precision T5500 Precision (EHW400)
Chipset
Intel X5520
CPU
Intel Xeon X5670 (6 cores)
CPU frequency
2.93 GHz
RAM
12 GB
Graphics controller
NVIDIA Quadro FX 580
USB controller
Delock U3 PCIe 1XG205-1S Rev. 1.1
(2-port USB 3.0 to PCI Express x1 Gen 2 with Renesas
chipset)
Operating system
Windows 7 Ultimate 64-bit SP1
Measured by
Oscilloscope
Measured signal
ExposureActive
Table 14: Test setup components
