PXI (PCI eXtensions for Instrumentation) is an industrial standard platform derived from Compact PCI. PXI extends the traditional compact PCI platform BUS used in standard PCs to one suitable for test, measurement, and scientific applications. Besides featuring modularized instrumentation, open architecture and hot-swap functions, PXI is also equipped with high-speed network transmission, built-in counter, and simultaneous triggered data transmission interface.

The instruments implemented with compatible software and hardware can be integrated into PXI test systems. This condensed form factor replaces the traditional larger rack and stack instruments system with modularized cards and chassis. This greatly reduces required space and allows for more diversified measurement functions. The flexible structure and high-performance/low-cost advantages are even more beneficial for electronic products with short life cycles.

PXI systems have been successfully and extensively applied to testing in the automotive, semiconductor, aviation, and military applications.