The NI SCXI-1338 is a shielded screw terminal block compatible with SCXI-1120, SCXI-1120D, SCXI-1125, and SCXI-1126 modules. It is designed to measure 0–20 mA and 4–20 mA current sources as well as voltage sources. The core components are eight 249 Ω precision resistors (accuracy ±0.1%, temperature coefficient 10 ppm/°C, power 0.25 W), which convert current to voltage for module measurement. In terms of terminal configuration, there are 18 screw terminals in total, with 8 pairs for signal connection and 1 pair for connecting to the SCXI chassis ground.
Technical Specifications
(1) Electrical Parameters
Compatible Modules: SCXI-1120/D (8 channels), SCXI-1125 (8 channels), SCXI-1126 (8 channels) .
Maximum Working Voltage: 300Vrms or ±300Vdc between channels and ground; 300Vrms or ±300Vdc between channels .
Maximum Input Current: ±20mA .
Wiring Specifications: Supports 14–26AWG wires, with a maximum gauge of 16AWG; terminal spacing is 0.5cm; front entrance size is 1.2×7.3cm .
(2) Mechanical Parameters
Dimensions: 177.8×79.38×30.48mm (7.0×3.125×1.2 inches) .
Weight: Approximately 200g (7 oz) .
(3) Environmental Parameters
Operating Temperature: 0–50°C .
Storage Temperature: –20–70°C .
Humidity: 10%–90% non-condensing .
Pollution Degree: Class 2 .
Altitude: Up to 2000m .
Application Scenarios in Industrial Automation Testing for SCXI-1338
Industrial Sensor Signal Acquisition
Used for collecting 4–20mA or 0–20mA current signals output by industrial sensors (e.g., pressure, flow, temperature sensors). It converts current to voltage through a 249Ω precision resistor for measurement. For example, monitoring signals from pipeline pressure sensors in chemical production lines.
Process Control System Testing
In industrial process control systems, it tests and calibrates control signals such as valve opening and motor speed to ensure accurate signal transmission. For instance, verifying whether the current control signals output by PLC (Programmable Logic Controller) meet system requirements.
High-Voltage Electrical Safety Testing
Leveraging its withstand voltage capacity of 300Vrms/±300Vdc, it measures voltage or current parameters of high-voltage electrical equipment during safety testing. The safety ground design avoids electric shock risks simultaneously.
Data Acquisition System Integration
Used in conjunction with modules like SCXI-1120, it integrates into industrial data acquisition systems to achieve synchronous acquisition of multi-channel current/voltage signals. For example, collecting real-time data from sensors at each workstation in an automotive production line's equipment condition monitoring system.
Equipment Fault Diagnosis
By measuring current fluctuations during equipment operation, it judges anomalies in industrial equipment such as motors and pumps. For example, when motor load changes, current signal variations are converted into voltage signals via SCXI-1338 for analysis, assisting in fault location.
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