PXIe-4357

The NI PXIe-4357 is a high-density, 20-channel RTD input module designed for the SC Express family of PXI Express data acquisition hardware. Engineered specifically for Pt100 Resistance Temperature Detectors (RTDs), it integrates high-resolution digitization with professional-grade signal conditioning in a single PXI Express slot. This module is the definitive choice for engineers performing large-scale thermal validation, battery pack testing, and environmental chamber monitoring where accuracy, channel density, and system synchronization are paramount.

1. High-Density Architecture & 24-Bit Resolution

The PXIe-4357 provides 20 dedicated RTD input channels, offering exceptional density for complex testing environments. Each channel utilizes a 24-bit Delta-Sigma ADC, delivering the sensitivity required to detect sub-millidegree temperature fluctuations. The high-resolution architecture, combined with a specialized anti-aliasing filter for each channel, ensures superior noise rejection and measurement repeatability, even in electrically noisy industrial settings.

2. Optimized for Pt100 with Flexible Wiring Support

Designed to interface seamlessly with the most common industrial temperature sensors, the PXIe-4357 supports various wiring configurations to balance cost and precision:

• 2, 3, and 4-Wire Support: Provides the flexibility to use 4-wire configurations for maximum lead-wire compensation and accuracy, or 2/3-wire setups for cost-sensitive, high-channel-count deployments.

• Integrated Excitation: The module provides a stable 0.9 mA current excitation per channel, specifically optimized for Pt100 sensors to minimize self-heating errors while maintaining a high signal-to-noise ratio.

3. Superior Accuracy & Self-Calibration Logic

To maintain NIST-traceable accuracy across long-term test campaigns, the PXIe-4357 incorporates advanced calibration features:

• Onboard Self-Calibration: The module features internal high-precision reference voltage and resistance sources, allowing for automatic self-calibration without removing the module from the chassis.

• Lead-Wire Compensation: Active circuitry cancels out the resistance of long sensor cables, ensuring that the reported temperature reflects the actual environment rather than cable artifacts.

4. PXI Express Synchronization & System Scalability

As a native PXI Express module, the PXIe-4357 leverages the PXIe backplane for advanced timing and synchronization. Multiple modules can be synchronized to sample data with microsecond-level alignment, enabling the creation of thermal monitoring systems with hundreds or even thousands of channels. This scalability is essential for full-vehicle thermal testing and large-scale aerospace structural monitoring.

5. Efficient Development with NI-DAQmx

The PXIe-4357 is fully integrated into the NI-DAQmx driver framework. This allows engineers to utilize LabVIEW, Python, or C++ to quickly configure “Temperature” virtual channels. The driver automatically handles the complex Callendar-Van Dusen equations to convert raw resistance into Celsius, Fahrenheit, or Kelvin, significantly reducing software development time and minimizing calculation errors.

6. Primary Application Scenarios

The PXIe-4357 excels in mission-critical temperature monitoring applications, such as:

• Battery Management System (BMS) Validation: Monitoring cell-level temperatures during charge/discharge cycles in EV batteries.

• Environmental Chamber Testing: High-accuracy mapping of temperature gradients in stability chambers.

• Aerospace Thermal Vacuum Testing: Monitoring spacecraft components during rigorous thermal cycling.

• Power Plant Monitoring: Tracking bearing and winding temperatures in large turbines and generators.

Summary

The NI PXIe-4357 is a robust, high-density solution for professionals who require uncompromised accuracy in temperature measurement. By combining 20 channels of 24-bit RTD conditioning with the high-speed synchronization of PXI Express, it offers a scalable and reliable platform for modern thermal analysis. Contact our engineering team today for professional technical support and competitive project pricing to optimize your next thermal validation project.