Specifications
30
Alvium USB Cameras User Guide V3.1.3
Exposure time and frame rate
Stated values were measured for a maximum bandwidth of 375 MBps for
, using the following test setup:
Typical operation
All timing values are based on following parameters:
•
Factory settings (camera after startup)
•
Minimum exposure time
•
Full resolution
•
Mono8 pixel format (also for color models)
•
Camera operation in freerun mode
•
Sensor readout using ADC bit depth
•
Without bandwidth limitations.
Bandwidth
: Data is measured for six steps in a range of 200 MBps to 375 MBps.
The default value for
DeviceLinkThroughputLimit
is 200 MBps for Alvium
1800 U cameras measured as average sensor readout.
Bit depth
: Values are measured for Mono8. If you are using color formats or 10-bit
or 12-bit pixel formats, frame rates fall below values for Mono8. increasing the
DeviceLinkThroughputLimit
value may increase maximum frame rates.
Component
Property
Desktop workstation
Dell Precision T5500 Precision (EHW400)
Chipset
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 7: Test setup components
Exposure time values, delays, and ROI frame rates
•
Available values and increments
for exposure time depend on
interdependencies between controls, see
on page 130. See also
Exposure start delay = exposure area
•
Calculation of maximum frame rates for different ROIs for Alvium USB cameras
does not allow to give a formula.
ROI frame rates
were measured for
typical
operation
as defined next.
