The NI SCXI-1321 is an offset-null and shunt calibration terminal block engineered to enhance measurement precision in multi-channel data acquisition systems. It provides hardware-based offset nulling for Wheatstone-bridge transducers and software-managed shunt calibration circuits, making it ideal for strain gauge, RTD, and thermistor applications. The shielded design with 18 screw terminals ensures reliable signal integrity, while socketed shunt and nulling resistors enable field customization without component replacement.
Technical Specifications
• Maximum Working Voltage: 300 V (CAT II)
• Shunt Calibration Resistor: 301 kΩ (user-customizable, socketed)
• Cold Junction Sensor Output Accuracy: ±10 mV/°C
• Cold Junction Sensor Accuracy: 1.3 °C
• Field Wire Gauge: 26–16 AWG
• Operating Temperature Range: 0 to 50 °C
• Storage Temperature Range: −20 to 70 °C
• Relative Humidity: 10 to 90% non-condensing
– Key Features
• 18 screw terminals for direct sensor connection
• Front-panel trimming potentiometers for per-channel manual offset nulling
• Individual nulling circuitry on each channel for precision bridge compensation
• Socketed nulling and shunt resistors for user customization without soldering
• Shielded enclosure to reject noise in high-channel-count applications
• Software-controlled shunt calibration enabling multi-channel management
• 301 kΩ shunt resistor engagement via switch activation
– Typical Applications
• Multi-channel strain gauge conditioning and calibration
• RTD and thermistor signal conditioning
• High-voltage temperature and voltage measurements
• Industrial test systems requiring frequent offset compensation
– Compatibility & Integration
The SCXI-1321 integrates with SCXI-1121 modules (revision C or later). Electrical safety compliance includes IEC 61010-1, EN 61010-1, UL 3111-1, UL61010B-1, and CAN/CSA C22.2 No. 1010.1.
