The NI SCXI-1327 is a high-voltage attenuator terminal block that extends the input measurement range of compatible SCXI modules. It employs a precision 100:1 resistive voltage divider per channel with individual switches to enable or disable attenuation, allowing flexible configuration for both high-voltage and low-voltage signal acquisition. The module features 18 screw terminals (16 signal terminals in 8 pairs plus 2 functional ground terminals) rated for 16 AWG maximum wire gauge, with 0.5 cm center-to-center spacing. A shielded enclosure maintains signal integrity across measurement tasks. An onboard temperature sensor provides cold-junction compensation for thermocouple measurements, delivering accuracy of ±0.5 °C on the sensor itself, with cold-junction compensation accuracy of 0.9 °C across the 15–35 °C range and 1.3 °C across 0–15 °C and 35–55 °C bands.
– Technical Specifications
• Attenuation: Precision 100:1 resistive voltage divider per channel
• Extended Input Voltage Range: Up to ±250 V (SCXI-1120/1120D/1121); up to 300 V threshold (SCXI-1126)
• Maximum Signal Voltage: 300 Vrms or ±300 VDC
• Input Impedance: 1 MΩ when integrated with SCXI modules
• Temperature Sensor Output: 1.91 V at 0 °C to 0.58 V at 55 °C
• Temperature Sensor Accuracy: ±0.5 °C
• Field-Wiring Connectors: Screw terminals; 16 AWG maximum wire gauge
• Terminal Spacing: 0.5 cm center-to-center
• Dimensions: 7.0 × 3.125 × 1.2 inches (17.8 × 7.94 cm)
• Front Entrance: 1.2 × 7.3 cm
– Key Features
• Per-channel attenuation control via individual switches
• Integrated cold-junction compensation for thermocouple applications
• Shielded enclosure for EMI rejection and signal fidelity
• Direct mating connector interface to SCXI module front connectors
– Compatibility & Integration
The SCXI-1327 operates with NI-DAQmx driver software and integrates with SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, and SCXI-1126 modules. It supports programming via LabVIEW and LabWindows/CVI environments.
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