51Alvium 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 Table 14. 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 Host setup and
bandwidth on page 221.
• Available values and increments for exposure time depend on other controls,
such as
DeviceLinkThroughputLimit. See Value changes by feature
interdependencies on page 216.
• For delays, see Exposure start delay = exposure area – exposure time. on page
208.
• 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
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