781056-01 National Instruments

781056-01  National Instruments Filter Modules

Product  Description：

National Instruments (NI) Filter Modules, integrated primarily within the C Series hardware platform for CompactDAQ and CompactRIO systems, are high-precision signal conditioning units designed to optimize data acquisition. These modules specialize in isolating clean, accurate waveforms by removing unwanted high-frequency noise and preventing alias artifacts before the analog signal reaches the Analog-to-Digital Converter (ADC). By combining advanced hardware conditioning with flexible software programming, NI Filter Modules ensure absolute signal integrity for dynamic structural, electrical, and acoustic testing.

Product Parameters

The technical capabilities of NI Filter Modules emphasize signal processing speed, high resolution, and exact filtering characteristics:

• ADC Resolution: Utilizes high-precision 24-bit Delta-Sigma converters with integrated analog pre-filtering to resolve microvolt-level signal variations.

• Filter Types: Supports software-selectable configurations including Butterworth filters for maximum passband flatness, Comb filters for deep notch noise rejection, and Elliptic filters for steep roll-off.

• Cut-off Frequency Range: Highly programmable settings spanning from under 10 Hz up to 100 kHz, allowing precise tuning to the target signal bandwidth.

• Sampling Rate Capacity: Simultaneous sampling architectures capable of handling continuous data rates from 10 S/s up to 51.2 kS/s per channel.

• Alias-Free Bandwidth: Delivers a clean passband up to 0.5 times the sampling frequency, ensuring that higher-frequency artifacts do not corrupt the digitized output.

• Channel Density: Offered in variable configurations, typically featuring 4-channel, 8-channel, or 16-channel variations to scale with test facility requirements.

Product Advantages

NI Filter Modules distinguish themselves through their hardware-software symbiosis and superior measurement fidelity:

• Software-Programmable Adaptability: Engineers can change the filter order, cut-off frequency, and coupling mode (AC or DC) directly inside NI LabVIEW or NI-DAQmx software without altering physical wiring.

• Simultaneous Phase Coherence: Features precise channel-to-channel phase matching, minimizing delay skew across multi-axis arrays which is vital for dynamic structural and phase analysis.

• High Common-Mode Rejection: Built-in differential inputs and robust galvanic isolation protect measurement data from common-mode voltage fluctuations and localized ground loops.

• Native Software Integration: Operates as part of the broader NI measurement ecosystem, allowing filtered hardware signals to route instantly into real-time mathematical analysis or data logging loops.

• Ruggedized Mechanical Form Factor: Compact C Series footprint operates across extended temperature ranges and withstands up to 50g of operational shock, making it suitable for field deployment.

Product Applications

These specialized signal conditioning modules are vital in applications where background noise compromises data:

• Noise, Vibration, and Harshness (NVH) Testing: Attenuating mechanical power train noise when evaluating automotive chassis dynamics or aircraft structural resonance.

• Acoustic Analysis: Interfacing with IEPE microphones and accelerometers to filter out ambient factory rumble during acoustic mapping and sound power testing.

• Strain and Structural Health Monitoring: Eliminating high-frequency electromagnetic noise when capturing micro-strain changes in bridges, wind turbines, and physical test fixtures.

• Power Quality Monitoring: Filtering transient surges and grid harmonics on transmission lines to analyze the fundamental performance of power electronics.

• Biomedical and Sensor Research: Isolating small analog voltage anomalies from high-impedance medical sensors or precision laboratory instrumentation.

Important Precautions

To preserve the accuracy of the filtering architecture and prevent signal distortion, follow these implementation rules:

• Settling Time Awareness: Enabling steep hardware filters adds an inherent delay and settling time to the measurement system. Ensure that the software data capture sequence allows the filter output to fully stabilize before logging critical data points.

• Anti-Aliasing Limitations: Remember that digital filtering alone cannot eliminate alias frequencies that exceed the Nyquist frequency of the input stage. Always verify that the hardware-level analog pre-filter matches your sampling rate constraints.

• Unused Channel Configuration: To minimize cross-channel inductive coupling and erratic register reading, short-circuit the terminals of any unused input channels or turn them off completely in your LabVIEW configuration.

• Shielding and Grounding Continuity: Always utilize high-quality shielded twisted-pair cables for sensor lines. The outer shield must be terminated at a single system ground (typically the chassis ground) to maximize the module's high-frequency noise rejection.

• Power Bus Loading: Review the total power consumption of all populated modules within the CompactDAQ or CompactRIO chassis. Filter modules containing active instrumentation amplifiers draw more current from the system rail than standard digital I/O.

The structure and details of the product：

Our services：

Shipping Port:  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

Warranty: one year

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