The NI SCXI-1120 is an 8-channel isolated analog input module for National Instruments SCXI systems, delivering galvanic isolation to protect measurement circuits from high common-mode voltages and ground loop interference. Designed for electrically noisy environments and applications requiring operational safety through electrical isolation, this module conditions signals from thermocouples, millivolt sources, process current loops, strain gauges, RTDs, and thermistors with field-configurable gain and filtering.
Technical Specifications
Input Channels & Isolation
• 8 analog input channels
• 250 Vrms working isolation between channels and chassis ground
• Configurable input ranges from ±2.5 mV to ±5 V with jumper-selectable gains: 1, 2, 5, 10, 20, 50, 100, 200, 250, 500, 1,000, and 2,000
• Extended voltage capability up to ±250 V with SCXI-1327 attenuator or ±1000 VDC (680 Vrms) with TBX-1316 terminal block
Signal Conditioning
• Output range: ±5 V
• Lowpass filter: jumper-selectable 4 Hz or 10 kHz
• Bandwidth (SCXI-1120D): up to 20 kHz
• Supported signal types: thermocouple, millivolt, volt, 4-20 mA and 0-20 mA process current, strain gauge, RTD, and thermistor (external excitation required for passive sensors)
Physical & Environmental
• Dimensions: 1.2 x 6.8 x 8.0 inches
• Operating temperature: 0 °C to 50 °C
• Connectors: 50-pin male ribbon (rear), 32-pin DIN C male (front), 18-screw terminal adapter available
– Key Features
• Dual operating modes: parallel-output for high scanning rates or multiplexed-output to increase channel count
• Field-configurable signal conditioning eliminates external amplifier requirements
• 250 Vrms isolation provides protection in high-voltage measurement environments
– Typical Applications
Multi-channel data acquisition in industrial control, automotive test, power systems monitoring, and laboratory environments where electrical isolation is critical.
– Compatibility & Integration
Compatible with SCXI-1000, SCXI-1000DC, SCXI-1001, and SCXI-2000 chassis. Full functionality with National Instruments MIO, 1200 Series, and Lab PC+ DAQ devices. Note: Obsolete status with availability through third-party specialists.
