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Home > Electrical & Electronics > Electrical Control System > NI SCXI-1141 Elliptical Lowpass Filter Input Module

NI SCXI-1141 Elliptical Lowpass Filter Input Module

NI SCXI-1141 Elliptical Lowpass Filter Input Module thumbnail-3

NI SCXI-1141 Elliptical Lowpass Filter Input Module photo-1

NI SCXI-1141 Elliptical Lowpass Filter Input Module photo-2

NI SCXI-1141 Elliptical Lowpass Filter Input Module photo-3

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

Key Specifications

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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.

1Yr

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Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
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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

Stopband Attenuation 120dB

Overvoltage Protection ±30V

Dimensions 1.2×6.8×8.0 inches

NI SCXI-1141Product Features

Programmable Filter
Equipped with an eighth-order programmable low-pass elliptical filter, configurable with cutoff frequencies from 10Hz to 25kHz, or set from 0.1Hz to 100kHz.
Combined Filter Technology
Adopts a combination of analog and switched-capacitor filters, providing 10,000 discrete, software-programmable cutoff frequencies while maintaining low noise performance.
External Clock I/O
Provides external clock input and output options, allowing external clocks to set filter cutoff frequencies in tracking filter applications.
Channels and Gain
Features 8 channels, each with programmable gain. Input range: ±50mV to ±5V.
Sampling Rate
Maximum sampling rate: 333kS/s (at any gain).
Modular Design
Adopts a modular design for easy integration and expansion with other SCXI modules to build complete control systems.
Programming and Control
Supports multiple programming languages and development environments (e.g., LabVIEW, LabWindows/CVI) and can be configured via the Measurement & Automation Explorer tool.

Technical Specifications

Attenuation Rate: 135dB/octave
Passband Flatness: ±0.1dB
Stopband Attenuation: 120dB
Input Noise: Low
Input Impedance: High
Overvoltage Protection: ±30V
Operating Voltage: ±5V (Category I, channel to ground), ±10V (Category I, channel to channel)
Dimensions: 1.2×6.8×8.0 inches

Typical Applications

Sensor Interfaces
Connects to various sensors (temperature, pressure, displacement, etc.) to acquire and process sensor output signals.
Industrial Automation Systems
Integrates into industrial automation systems for real-time monitoring, control, data acquisition, and process optimization in industrial environments.
Laboratory Measurements
Supports scientific measurements and experiments in physics, chemistry, biology, and other research fields.
Control Systems
Processes sensor signals to enable system feedback and control in custom control system architectures.
Data Acquisition Systems
Serves as a front-end component for acquiring and conditioning sensor signals, supporting real-time monitoring and data logging.
Vibration and Acoustic Analysis
Conditions and analyzes output signals from vibration and acoustic sensors for diagnostic applications.
Education and Training
Facilitates student learning of data acquisition, signal processing, and instrument control principles in educational laboratories.

Working Principle of NI SCXI-1141I. Hardware Architecture and Core Components

The NI SCXI-1141 is a signal conditioning module for analog signal acquisition in industrial environments, leveraging a modular design with the following key components:

Input Front-End Circuit
Includes signal buffers and protection circuits, supporting input ranges (±10V, ±5V, ±1V, ±0.1V) to interface with sensors (voltage, current, thermocouples, etc.).
Instrumentation Amplifier
Features high common-mode rejection ratio (CMRR) to amplify differential signals while suppressing common-mode interference (e.g., ground loop noise), ensuring signal accuracy.
Filter Module
Integrates a low-pass filter with configurable cutoff frequencies (e.g., 10kHz or 4Hz) to remove high-frequency noise and prevent signal distortion.
Isolation Circuit
Provides 300V rms electrical isolation per channel via transformer or optocoupler technology, breaking electrical connections between channels and ground to eliminate interference.
Calibration and Storage Unit
Built-in EEPROM stores calibration constants, supporting software-programmable offset calibration to eliminate zero-drift errors via ground reference points.

II. Signal Processing Flow

Signal Input and Protection

Analog signals from sensors (voltage, current, thermocouple emf) enter the module's input channels, protected by front-end circuits against overvoltage/overcurrent.
High input impedance (1MΩ) minimizes sensor loading to maintain signal integrity.

Differential Amplification and Common-Mode Rejection

Instrumentation amplifiers amplify differential signals (e.g., voltage differences across sensors) with software-configurable gain (1, 10, 100, 1000×) for varying input amplitudes.
High CMRR (>100dB) suppresses environmental common-mode interference (e.g., power line noise) to improve SNR.

Filtering and Noise Elimination

Low-pass filters attenuate out-of-band noise based on configured cutoff frequencies (e.g., 10kHz for high-frequency dynamic signals, 4Hz for low-frequency slow-varying signals), adhering to the Nyquist sampling theorem.

Electrical Isolation

Isolation circuits electrically separate input signals from output circuits to avoid ground potential difference-induced loop interference, protecting downstream DAQ devices (e.g., NI DAQ cards) from high-voltage surges.

Calibration and Output

Software-triggered offset calibration: Inputs are grounded via analog switches to measure and store offset errors, which are auto-compensated during subsequent acquisitions.
Buffered output signals with 50Ω impedance match cable transmission characteristics, reducing signal reflection.

III. Communication and Control Mechanisms

Driver and Software Interface
Relies on NI-DAQmx driver (9.0 or later) for programming via development environments (LabVIEW, C/C++), enabling configuration of gain, filtering, calibration, etc.
Output Modes
Supports parallel output (each channel connects independently to a DAQ card) or multiplexed output (8 channels time-share a single DAQ channel via internal multiplexers).
Power and Compatibility
Requires external ±5V/±15V power, operating from -40°C to +85°C for harsh industrial environments.

IV. Key Technical Points

Role of Isolation Technology
300V rms isolation prevents interference and avoids ground loop issues between measurement systems, ideal for environments with strong EMI (motors, variable frequency drives).
Advantages of Programmable Gain
Dynamically adjusts gain based on input signal amplitude (from mV-level thermocouple signals to V-level voltage signals), optimizing ADC sampling range for higher resolution.
Significance of Calibration Mechanisms
EEPROM-stored calibration constants compensate for errors from temperature drift and component aging, ensuring long-term measurement accuracy (±0.05% of reading + 2μV).