The NI PXI-2570 is a high-density, general-purpose SPDT relay module delivering 40 independent switching channels in a compact 3U single-slot PXI/cPCI form factor. Each channel features Form C relay architecture with normally closed, normally open, and common terminals, enabling flexible signal routing across hundreds of automated test loads. The module supports deterministic scanning with up to 32,000 steps at 145 cycles/s, minimizing host processor overhead in high-throughput test applications.
Technical Specifications
Relay Configuration
• 40-channel SPDT (Form C) armature latching relays
• Normally closed (NC), normally open (NO), and common (COM) terminals per channel
• Maximum switching current: 1 A per channel
• Maximum carry current: 1 A per channel
• All 40 channels simultaneously rated at maximum current (≤55 °C)
Electrical Performance
• Maximum switching voltage: 100 VDC or 100 VAC (channel-to-channel); 100 V CAT I (channel-to-ground)
• Maximum impulse voltage: 500 V
• Maximum switching power: 60 W, 62.5 VA per channel (DC to 60 Hz)
• Minimum switch load: 20 mV/1 mA
• Switch bandwidth: 40 MHz
Dynamic Characteristics
• Scan list capacity: 32,000 steps
• Scanning rate: 145 cycles/s
• Hardware trigger synchronization with sub-150 ns pulse width detection (digital filtering disabled)
Safety & Limits
• Measurement Category I (CAT I); signal voltages not to exceed 100 V
• Not suitable for Categories II, III, IV, or mains supply circuits (115/230 VAC)
• Hazardous voltages (>42.4 Vpk/60 V DC) cannot coexist on the same module as low-voltage channels (≤42.4 Vpk/60 V DC)
• Inductive load switching generates transients; additional protection may be required
– Key Features
• High channel density maximizes switching capacity per PXI slot
• Deterministic scanning with 32,000-step lists reduces test cycle times
• Hardware trigger support enables tight instrument synchronization
• Form C relay topology supports both source and sink switching configurations
– Typical Applications
• Automated test equipment (ATE) requiring large channel counts
• Multi-channel signal routing in measurement systems
• Industrial switching applications within CAT I voltage limits
– Compatibility & Integration
• 3U single-slot PXI/cPCI module
• Scales to hundreds of channels per chassis; thousands across multiple chassis
