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USB has become the standard connection type for a variety of devices including keyboards, mice,

digital cameras, printers and external hard drives. The ease of plug-and-play and USB's portability

has endeared itself to engineers and scientists as a platform for  data acquisition applications. 


It makes sense then that Microsoft has put a significant amount of investment into USB improvements

for Windows 7. These improvements include


  • Elimination of non-necessary timers
  • Selective hub suspension
  • Lower enumeration time for USB flash device

These improvements have benefits for National Instruments products as well and, in particular, increases in the

performance of USB data acquisition devices. Here are some of the initial benchmarks for the new NI CompactDAQ

products cDAQ-9198 and cDAQ-9174


Note: The larger bar means higher performance, the same hardware is used on the Windows XP and

Windows 7 operating systems. The x-axis measurements through-put/bandwidth


USB Performance.jpg

The increased hardware performance combined with the Multi-core optimization of both the Windows 7 operating

system and the LabVIEW development environment result in a performance increase of up to 20% when performing

high-speed or multifunction I/O measurements.

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