Description
NI SCXI-1326 SCXI Terminal Block Module
The NI SCXI-1326 is a high-voltage terminal block designed by National Instruments (NI) specifically for use with the SCXI-1126 8-channel isolation amplifier module. It serves as the physical interface between your external field signals (sensors/wires) and the measurement hardware.
Product Detailed Description
The SCXI-1326 is a shielded terminal block that simplifies the connection of high-voltage signals. It features screw terminals for easy wiring and an onboard thermistor for Cold-Junction Compensation (CJC), which is critical when using the SCXI system for thermocouple measurements. The rugged, shielded enclosure ensures signal integrity by minimizing electromagnetic interference (EMI).
Technical Parameters
| Parameter | Specification |
| Compatibility | Exclusively for NI SCXI-1126 modules |
| Number of Terminals | 48 screw terminals (Signal, Guard, and Chassis) |
| Max Working Voltage | 250 Vrms (Installation Category II) |
| CJC Sensor Type | Precision Thermistor |
| CJC Accuracy | $\pm 0.5$ °C to $\pm 0.9$ °C (depending on range) |
| Wire Gauge | 12 to 28 AWG |
| Shielding | Fully metal-shielded enclosure |
| Connection Type | Screw-terminal connectivity |
Product Advantages
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Seamless CJC Integration: The built-in thermistor allows the software to automatically compensate for ambient temperature at the terminal junctions, ensuring highly accurate thermocouple data.
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High Safety Standards: Rated for 250 Vrms, it provides a secure environment for measuring industrial-level voltages without risking damage to the DAQ system.
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Signal Integrity: The heavy-duty shielding protects low-level signals from the noisy environments typically found in factory floors or research labs.
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Ease of Use: Screw terminals eliminate the need for custom cabling or soldering, allowing for rapid prototyping and deployment.
Important Considerations & Precautions
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Module Matching: This terminal block is only compatible with the SCXI-1126 module. Attempting to force it onto other SCXI modules (like the 1120 or 1125) may damage the connectors.
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Safety Clearance: When measuring high voltages (above 30 Vrms), ensure that wires are properly stripped and secured so that no bare copper is exposed outside the terminal housing.
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Strain Relief: Use the internal strain-relief bar to secure the cables. This prevents accidental wire disconnection or mechanical stress on the screw terminals.
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Environmental Limits: Ensure the operating environment does not exceed 0°C to 50°C to maintain the accuracy of the CJC thermistor.
Product Applications
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High-Voltage Temperature Monitoring: Using thermocouples in environments where common-mode voltages are high (e.g., motor windings).
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Industrial Control Systems: Interfacing high-voltage sensors (0–10V, 4–20mA, or direct AC/DC inputs) with a PC-based data acquisition system.
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Automotive Testing: Measuring battery cell voltages in electric vehicle (EV) testing rigs.
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Power Quality Analysis: Monitoring voltage fluctuations in electrical distribution panels (within the 250V limit).
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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