Modular instruments, centered around virtual instrument technology, cover standard bus modules such as PXI/PXIe, VXI, CPCI, and VPX, including modules for signal generation and simulation, signal reception and analysis, routing switching, communication interface protocols, aviation navigation signal simulation, and signal conditioning. Thanks to their compact size, high versatility, strong scalability, and ease of upgrade, these modular instruments are highly suitable for building test systems and are used in aviation, automotive, and industrial testing applications. CETC SiYi Technology Co., Ltd. is committed to advanced modular instrument technology research and product development, and can provide high-quality automated test system application solutions based on modular instruments.