The National Instruments 778572-27 is a high-voltage PXI multiplexer switch module designed for medium to high-density automated test applications. Part of the PXI-2527 product range, this module features 32 channels with a voltage rating of 300 V and is equipped with high-power electromechanical relays. It serves as an optimal front end for PXI Digital Multimeters (DMMs), such as the NI 407x FlexDMM, enabling flexible channel expansions across various measurement configurations, including 64x1 1-wire, 32x1 2-wire, and 16x1 4-wire setups. The 778572-27 enhances testing throughput with advanced scanning capabilities that allow for the quick management of up to 32,000 connections, utilizing hardware triggers to efficiently cycle through them while minimizing disruption to the host CPU. With each measurement, the NI 407x FlexDMM activates the multiplexer, streamlining the scanning process.

This module also incorporates onboard relay counting, which monitors the actuations of each relay, thereby improving system efficiency and reliability. This functionality aids in reducing unexpected downtime and facilitates predictive maintenance through programmable relay count collection. Signal connections are easily established via the TB-2627 front-mounting screw-terminal block, and the HV6-BAN4 cable allows seamless interfacing with DMM banana jack inputs, ensuring safe and efficient connectivity. The NI-SWITCH driver software, compliant with IVI standards, supports the full functionality of all National Instruments PXI switch modules, including the 778572-27. Additionally, users can leverage the NI Switch Executive software for visual routing and intuitive switch management, along with the NI-SWITCH soft front panel to facilitate relay operation and debug switch code execution.