SCXI-1125 National Instruments Voltage Input Module

Description

SCXI-1125 National Instruments Voltage Input Module

Product Dimensions：

Product Description

The NI SCXI-1125 is an 8-channel isolated analog input module for the SCXI (Signal Conditioning eXtensions for Instrumentation) system from National Instruments. Designed to provide high-quality signal conditioning and isolation, it’s an excellent choice for a variety of measurement tasks, especially those involving thermocouples, voltage, or current signals in harsh electrical environments. This module is designed to fit into an SCXI chassis, which acts as a front-end signal conditioning platform for a DAQ (Data Acquisition) device.

Product Parameters

• Model: SCXI-1125
• Product Type: Isolated Analog Input Module
• Channels: 8 isolated analog input channels
• Isolation: 300 Vrms working isolation between channels and to earth ground
• Input Range: Programmable input ranges from ±2.5 mV to ±5 V
• Extended Input Range: With the SCXI-1313 high-voltage attenuator terminal block, the range can be extended up to ±300 V.
• Lowpass Filter: Programmable lowpass filter on each channel (4 Hz or 10 kHz)
• Scan Mode: Supports random scanning, allowing you to select and acquire data from channels in any order.
• Output: Multiplexes all 8 channels into a single output for the DAQ device.
• Compatibility: Designed for use with an SCXI chassis and a compatible DAQ device.

Product Advantages

• High-Voltage Isolation: The 300 Vrms of channel-to-channel and channel-to-earth isolation is a significant benefit. This protects your DAQ system from high-voltage transients and ground loops, ensuring safe and reliable measurements in electrically noisy environments.
• Signal Conditioning: Each channel includes a programmable gain amplifier and a lowpass filter. This allows you to amplify low-level signals like those from thermocouples and filter out high-frequency noise, which improves the accuracy and integrity of your measurements.
• Flexibility: The SCXI-1125’s programmable input ranges and random scanning capability make it highly versatile. It can handle a wide variety of signals and allows you to optimize your data acquisition for the specific needs of your application.
• Expandable: The modular nature of the SCXI platform means you can easily add more SCXI-1125 modules to the chassis to increase your channel count without changing your DAQ hardware.

Precautions

• Obsolete Status: The NI SCXI-1125 is an obsolete product. While it’s still widely available from third-party vendors and is a reliable legacy device, National Instruments no longer manufactures or provides direct support for it. For new systems, it’s recommended to consider a modern equivalent.
• Proper Connections: Always use the correct terminal block (such as the SCXI-1313) and shielded cabling to connect your signals to the module. This is critical for maintaining signal integrity and safety.
• ESD Precautions: Handle the module with care and follow proper electrostatic discharge (ESD) precautions to prevent damage to the sensitive electronics.
• System Compatibility: Ensure your SCXI chassis and DAQ hardware are compatible with the SCXI-1125. Refer to the official documentation for supported chassis and DAQ models.

Product Applications

The NI SCXI-1125 is a robust solution for a variety of test and measurement applications, particularly in industrial and research settings. Its primary applications include:

• Thermocouple Measurements: Amplifying and isolating low-voltage signals from thermocouples to accurately measure temperature.
• Industrial Process Monitoring: Monitoring analog signals like voltage and current from sensors in industrial machinery and processes.
• Power System Analysis: Acquiring data in power generation and distribution systems where high voltages and ground loops are a concern.
• Automotive Testing: Measuring signals in vehicle test benches where electrical noise is common.

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