The National Instruments SCXI (Signal Conditioning eXtensions for Instrumentation) platform delivers modular signal conditioning, data acquisition, and industrial control for DAQ systems. Built on a chassis-based architecture, SCXI integrates analog input/output modules, multiplexers, and specialized signal conditioning in a single low-noise environment. Engineers configure customized solutions by selecting from a range of purpose-built modules—each handling amplification, filtering, isolation, multiplexing, and conversion tasks. Two chassis options support deployments from compact benchtop setups to larger multi-module installations.
Technical Specifications
SCXI Chassis
• SCXI-1000 / SCXI-1000DC: 4-module capacity; AC powered (1000) or 9.5–16 VDC powered (1000DC)
• SCXI-1001: 12-module capacity; AC powered
Analog Input Modules
• SCXI-1100: 32 channels; software-programmable gain instrumentation amplifier; jumper-selectable low-pass filters; millivolt, volt, and current input support
• SCXI-1102/1102B/1102C: Thermocouple-optimized; millivolt, volt, 0–20 mA, and 4–20 mA inputs; 2 Hz low-pass filter per channel
• SCXI-1104/C: 32 differential channels; 0–30 VAC RMS, ±42 VAC peak, ±60 VDC input; divide-by-10 attenuator
• SCXI-1112: 8 differential channels + 8 cold-junction sensors; 3-pole 2 Hz low-pass filter; fixed 100 gain per channel
Analog Output Modules
• SCXI-1124: 6 isolated channels; 12-bit resolution; 0–20 mA current output or voltage sourcing; DC operation
• SCXI-1200: 12-bit DAC; 2 analog output channels (0–+10 V, ±5 V); 8 single-ended analog inputs (4 differential configurable); 32 TTL-compatible digital I/O channels
– Key Features
• Modular architecture enables task-specific signal conditioning
• Instrumentation amplifiers with programmable and fixed-gain configurations
• Integrated filtering from 2 Hz to selectable cutoff frequencies
• Isolated analog outputs for industrial control loop integration
• Relay multiplexing and matrix switching for expanded channel count
• Low-noise chassis design isolates analog signals from host system noise
– Typical Applications
• Multi-channel thermocouple and RTD measurement systems
• Industrial process monitoring and control
• High-channel-count data acquisition requiring signal isolation
• Battery-powered field measurement (SCXI-1000DC)
• Medium-voltage signal acquisition and conditioning
– Compatibility & Integration
SCXI modules interconnect within standard AC- or DC-powered chassis and integrate with National Instruments DAQ devices through standard interfaces. Module selection determines input/output signal ranges, filtering characteristics, and isolation requirements for specific measurement tasks.
