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Home > Electrical & Electronics > Electrical Control System > NI SCXI-1102 Voltage Input Module

NI SCXI-1102 Voltage Input Module

NI SCXI-1102 Voltage Input Module thumbnail-3

NI SCXI-1102 Voltage Input Module photo-1

NI SCXI-1102 Voltage Input Module photo-2

NI SCXI-1102 Voltage Input Module photo-3

Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

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Material:

Other, Global universal model

Condition:

Other, Global universal model

Task:

Other, Global universal model

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Guizhou Yuanmiao Automation Equipment Co., Ltd.

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China

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Material Other, Global universal model

Condition Other, Global universal model

Task Other, Global universal model

Mathematical Model Other, Global universal model

Signal Other, Global universal model

Customized Non-Customized

Structure Other, Global universal model

Isolation Voltage 2500V rms

Linearity ±0.01% FSR

Operating Temperature 0°C to +55°C

NI SCXI-1102Overview

The NI SCXI-1102 is a high-precision signal conditioning module specifically designed for thermocouple signals, suitable for use with signal conditioning chassis such as the NI SCXI-1000. It primarily amplifies, performs cold junction compensation (CJC), and linearizes the weak voltage signals (typically microvolt-level) output by thermocouples, while suppressing electromagnetic interference in industrial environments through electrical isolation to adapt signals to the input range of data acquisition (DAQ) devices. This module is widely applied in scenarios requiring high-precision temperature measurement, including temperature monitoring, industrial furnace temperature control, and thermal system analysis.

Core Functions and FeaturesDedicated Thermocouple Signal Processing

Cold Junction Compensation (CJC): Equipped with a high-precision temperature sensor to real-time compensate for temperature changes at the thermocouple reference junction (cold junction), eliminating measurement errors caused by ambient temperature fluctuations and ensuring temperature measurement accuracy.
Linearity Calibration: For the non-linear characteristics of different thermocouple types (e.g., J, K, T, E, R, S, B, N), linearization processing is performed through a combination of hardware and software, directly outputting voltage signals linearly proportional to temperature.
Wide-Range Gain Adjustment: Supports adjustable gains of 1, 10, 100, and 1000 times, adapting to microvolt-level signals output by thermocouples (e.g., a K-type thermocouple outputs approximately 0mV at 0°C and 4.096mV at 100°C), amplifying them to the optimal sampling range (e.g., ±10V) of DAQ devices.

Anti-Interference and Reliability Design

Electrical Isolation Protection: Built-in 2500V rms electrical isolation between channels and between channels and ground effectively suppresses ground loop noise and common-mode interference, especially suitable for strong electromagnetic interference environments (e.g., near motors and frequency converters).
Filter Function: Integrates a fourth-order Bessel low-pass filter with selectable cutoff frequencies of 10Hz, 100Hz, 1kHz, or 10kHz to filter out high-frequency noise (such as power supply ripple and mechanical vibration interference).
Overload Protection: Withstands ±40V input voltage without damage, adapting to complex wiring environments in industrial fields.

Hardware Compatibility and Expandability

Chassis Adaptability: Supports insertion into 8-slot chassis such as the SCXI-1000. A single module provides 4 independent thermocouple channels, each configurable for different thermocouple types with mutual isolation between channels.
Bus Connection: Seamlessly connects to NI DAQ devices (such as PCIe, USB, and PXI series) via SCXI-1324 cables, supporting plug-and-play and hot swapping for convenient system expansion.

Technical Parameters

Parameter Type	Specific Index
Signal Input Range	Dedicated for thermocouples (supports J, K, T, E, R, S, B, N types), input voltage range varies with thermocouple type
Output Voltage Range	±10V (fixed, dependent on gain settings)
Isolation Voltage	2500V rms (between channels and between channels and ground)
Cold Junction Compensation Accuracy	±0.5°C (typical value at 25°C)
Temperature Measurement Accuracy	±0.5°C (K-type thermocouple at 25°C with 1000× gain)
Linearity	±0.01% FSR (full scale range)
Filter Cutoff Frequency	10Hz, 100Hz, 1kHz, 10kHz (software-selectable)
Common-Mode Rejection Ratio (CMRR)	110dB (at 1kHz)
Sampling Rate	Up to 100kS/s (dependent on DAQ device performance)
Operating Temperature	0°C to +55°C (non-condensing)

Typical Application ScenariosReal-Time Industrial Furnace Temperature Monitoring

Scenario: Temperature control of heating furnaces in the metallurgical industry
Configuration: SCXI-1000 chassis + SCXI-1102 module (K-type thermocouple) + NI PXIe-6366 DAQ card
Function: Amplifies microvolt signals from thermocouples through cold junction compensation and 1000× gain, eliminates furnace vibration interference with 10Hz low-pass filtering, acquires furnace temperature data in real time, and achieves closed-loop temperature control via LabVIEW with an accuracy of ±1°C.

Laboratory Temperature Characteristic Testing

Scenario: Temperature drift experiment for semiconductor devices
Configuration: SCXI-1102 + T-type thermocouple + chassis + USB-6341 acquisition card
Function: Amplifies thermocouple signals 100 times, directly outputs temperature values using linearization calibration, tests device performance changes in the range of -20°C to 80°C with a constant temperature chamber, and records data in real time via LabVIEW to generate temperature characteristic curves.

Power Equipment Temperature Monitoring

Scenario: Transformer winding temperature monitoring
Configuration: SCXI-1102 + multi-channel SCXI chassis + NI PCIe-6353 DAQ card + multiple K-type thermocouples (embedded in windings)
Function: Conditions multiple thermocouple signals, avoids high-voltage equipment interference through 2500V electrical isolation, monitors each winding temperature in real time, and triggers alarms when temperatures exceed thresholds for equipment fault early warning.

Collaborative Applications with Other ModulesMixed Signal Acquisition Systems

Advantage: Mixed installation of SCXI-1102 (thermocouple conditioning), SCXI-1100 (voltage conditioning), SCXI-1180 (current conditioning), and other modules in the SCXI chassis adapts to synchronous acquisition of multiple signal types such as temperature, vibration, and current.
Case: In an automotive engine testing system, simultaneously acquire cylinder temperature (thermocouple signals), vibration acceleration (voltage signals), and fuel injection current (4-20mA signals), achieving unified conditioning through the same chassis to improve system integration.

Deep Integration with LabVIEW

Function: Using LabVIEW's SCXI driver library, one-click configuration of module parameters (such as thermocouple type, gain, filter frequency), real-time display of temperature waveforms, generation of trend charts, and support for custom algorithm development (such as temperature anomaly warning and historical data tracing).

Installation and Maintenance Key PointsInstallation Notes

Wiring Specifications: Use dedicated compensation wires for thermocouple signal lines, ensure correct polarity (+/- poles correspond to module input terminals), and use shielded cables to reduce electromagnetic interference.
Cold Junction Compensation Calibration: When first used or when ambient temperature changes significantly, it is recommended to calibrate cold junction compensation via NI MAX software to ensure temperature measurement accuracy.

Troubleshooting

Large Temperature Measurement Deviation: Check whether the thermocouple type configuration is correct, whether cold junction compensation is enabled, or calibrate the cold junction compensation offset via NI MAX.
High Signal Noise: Confirm whether the filter frequency setting matches the signal bandwidth (e.g., temperature signals are typically low-frequency, and 10Hz filtering can be set), or check whether the cable shielding layer is well grounded.

Summary

As a professional thermocouple signal conditioning module, the NI SCXI-1102 becomes a core component in the field of temperature measurement with its high-precision cold junction compensation, linearization processing, and strong isolation capability. Its core advantages include:

Specialization: Specifically designed for thermocouples, supporting direct access to multiple thermocouple types without additional signal conversion circuits;
High Precision: Cold junction compensation accuracy reaches ±0.5°C, and temperature measurement errors after linearization processing are small, suitable for precise temperature monitoring;
Flexibility: Deep integration with NI hardware and LabVIEW software supports multi-channel synchronous acquisition and custom algorithm development, adapting to complex requirements in laboratories and industrial fields.

Product Tags: SCXI-1102 , SCXI-1102B , SCXI-1104C