Modular instrumentation uses the PXI platform.

PCI eXtensions for Instrumentation (PXI) is a modular platform designed for building multifunctional instrumentation systems, test equipment for testing electronics, automation systems, modular laboratory instruments, etc. The PXI standard addresses the challenge of continually increasing instrumentation performance, functionality, and reliability. This platform makes it easy to install, replace and use different measuring devices together in a single compact design.