The NI SCXI-1163R is a 32-channel optically isolated solid-state relay switch module for SCXI chassis integration. It routes high-voltage loads with optical isolation between banks, protecting sensitive measurement equipment from ground loops and voltage transients. Organized as 8 banks of 4 normally open relays with individual common poles, the module delivers 300 Vrms isolation per bank and handles loads up to 240 VAC/VDC at 200 mA with maximum 1 µA leakage current. Control via SCXIbus or direct parallel cabling to National Instruments DIO devices enables flexible system integration. Operating time is 15 ms typical per relay with actuation in 2 ms, supporting up to 750 operations per second. The module exhibits 5 × 10⁶ mechanical operations and 5 × 10⁶ electrical operations at 5 W. Housed in a compact form factor measuring 17.2 cm × 20.3 cm × 3.0 cm and weighing 625 g, it operates across 0 °C to 50 °C.
Technical Specifications
• Channels: 32 (8 banks of 4 relays, 1 common per bank)
• Relay Type: Solid-State Relay (SSR), Normally Open (Form A)
• Load Voltage: 240 VAC/VDC maximum
• Load Current: 200 mA maximum
• Maximum Working Voltage: 450 V
• Isolation Voltage: 300 Vrms per bank
• Leakage Current: 1 µA maximum
• Operate/Release Time: 15 ms typical each
• Actuation Time: 2 ms
• Switching Speed: 750 operations/second
• Expected Life (Mechanical): 5 × 10⁶ operations
• Expected Life (Electrical, 5 W): 5 × 10⁶ operations
• Expected Life (Maximum Capacity): 10⁵ operations
• Connector: 48-pin DIN C male
• Power-On State: Relays open
– Key Features
• Optical isolation eliminates ground loop coupling between banks and internal circuitry
• Low leakage current (1 µA) for precision signal switching
• Fast actuation at 2 ms with 15 ms operate/release cycles
• Parallel operation compatible with DIO-24, DIO-32F, and DIO-96 modules
• Compact 1.2-inch height fits standard SCXI chassis slots
– Typical Applications
• Automated test systems requiring load switching
• Data acquisition with isolated signal routing
• Process control with high-voltage load management
• Equipment protection against transient overvoltages
– Compatibility & Integration
Integrates into SCXI chassis via SCXIbus control or direct parallel connection to National Instruments Digital I/O devices. Supports LabVIEW, LabVIEW Real-Time Module, LabWindows/CVI, Measurement Studio, and NI Switch Ex software environments.
