1 Introduce
Since the 70's in last century, the combining of testing equipment and computer extended gradually, testing technique experienced from a quick change of GPIB, VME, VXI [1], [2], [3], [4], to the progress of intelligence, modularization, miniaturization and universal. In recent years, the PXI (PCI eXtensions For Instrumentation) technique based on PCI bus develops so quickly that it has abroad application in automatization testing realm [5], [6], [7]. This technique not only satisfies automatization testing instrument's developing needs, but also combines the PC technique's advantage, so it becomes interrelated realm's foreland and hotspot.