National Instruments 781420-00 PXI Carrier Module 

National Instruments part number 781420-00 is an identifying part number for the PXI-2800 a PXI Carrier Module. The NI 781420-00 Carrier Module is a framework designed for SwitchBlock, capable of accommodating up to six SwitchBlock relay cards and occupying four PXI slots. By connecting multiple SwitchBlock relay cards through the bus interface, users can create extensive arrays with over 2,000 crosspoints across four PXI slots or more than 8,000 crosspoints in a single PXI chassis. These configurations are ideal for automated test systems requiring high channel counts. 

SwitchBlock relay cards simplify setup, routing, programming, and maintenance of switches in large-scale switching applications. They include multiple two-wire switches for differential measurements and 16-row switches that facilitate simultaneous connections. The 781420-00 Carrier Module incorporates Switch Executive switch-management software, enabling graphical configuration of switch systems either relay by relay for precise control or automatically for routing signals across multiple relay cards. 

Combining Switch Executive with LabVIEW framework-design software allows users to configure, program, and maintain complex matrix setups efficiently. This integration supports the creation of multiple routing groups to meet diverse testing needs. SwitchBlock utilizes a modular carrier that can accommodate up to six relay cards, occupying four slots within a PXI chassis. Users have the flexibility to combine up to four SwitchBlock carriers, enabling the creation of internally routed matrices with up to 8,832 crosspoints in a single PXI chassis. This setup is ideal for applications requiring extensive and flexible switching capabilities in automated test systems.