The National Instruments PXI-2568 is a high-density, 31-channel multiplexer switch module for automated test equipment systems. This 3U PXI/cPCI module features independent single-pole, single-throw (SPST) Form A latching relays with exceptionally low on-resistance below 0.15 Ω and minimal thermal offset voltage. The module delivers deterministic scanning through a 32,000-step scanlist capacity and achieves tight instrument synchronization via hardware triggers at a scan rate of 145 cycles/s. It handles switching voltages to 150 VDC/150 VAC at 2 A per channel with a maximum switching power of 60 W per channel, making it suitable for signal routing in mid-level voltage test applications. Fully software-programmable through NI-SWITCH drivers and NI Switch Executive, the PXI-2568 integrates into modular test platforms requiring flexible channel multiplexing with deterministic timing.
Technical Specifications
• Channels: 31 SPST (Form A, latching) or 15 DPST configuration
• Switching Voltage: 150 VDC / 150 VAC maximum
• Switching Current: 2 A maximum per channel
• Carry Current: 2 A maximum
• Switching Power: 60 W, 62.5 VA per channel
• Switch Bandwidth: 40 MHz
• On-Resistance (Initial): < 0.15 Ω
• Scan Rate: 145 cycles/s
• Scanlist Capacity: 32,000 steps
• Impulse Voltage Withstand: 800 V
• Power Consumption: 6 W at 5 V, 2.5 W at 3.3 V
• Operating Temperature: 0 to 55 °C
• Form Factor: 3U, one-slot PXI/cPCI module
• Connector: 62-pin male DSUB
– Key Features
• Electromechanical armature relays deliver reliable, low-resistance switching
• 32,000-step scanlist enables complex test sequences without reprogramming
• Hardware trigger support ensures deterministic, synchronized operation
• Low on-resistance and thermal offset minimize measurement errors
• Measurement Category I rated for signals ≤150 V
• Compact 21.6 cm × 2.0 cm × 13.0 cm footprint
– Typical Applications
• Signal routing in automated test equipment
• Multi-channel analog signal conditioning
• RF and microwave test switch matrices
• Design validation and characterization systems
– Compatibility & Integration
The PXI-2568 integrates with NI-SWITCH IVI-compliant drivers and supports LabVIEW, LabWindows/CVI, Measurement Studio for Visual C++, and NI Switch Executive software. Optional accessories include replacement relay kits, shielded D-SUB cables, and screw terminal blocks for simplified integration.
