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
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.