PCI-6289 National Instruments

PCI-6289 National Instruments Filter Modules

Product  Description：

National Instruments (NI) Filter Modules, integrated within platform systems such as PXI, PXI Express (PXIe), and C Series (CompactDAQ/CompactRIO), are specialized analog signal conditioning units designed to remove noise, prevent aliasing, and shape electrical signals before digitization. These modules provide critical front-end analog processing, including low-pass, high-pass, and band-pass filtering, ensuring the integrity of high-speed data acquisition systems used in structural test, acoustics, vibration, and RF applications.

Product Parameters

The technical characteristics of NI Filter and Signal Conditioning Modules vary depending on the platform but typically match the following performance criteria:

• Cutoff Frequency Range: Fully programmable via software, ranging from less than 1 Hz up to several hundred kilohertz, or tens of megahertz for RF-specific filtering modules.

• Filter Order and Architecture: Features high-order analog filter topologies, such as 4-pole, 6-pole, or 8-pole Butterworth, Bessel, or Elliptic filters, ensuring steep roll-off characteristics.

• Anti-Aliasing Attenuation: Delivers high rejection rates, often exceeding 80 dB to 100 dB at the stopband, effectively preventing out-of-band signals from distorting sample measurements.

• Channel Density: Modular layouts commonly offer 2, 4, 8, or 16 independent analog channels per slot to align with multi-sensor deployment.

• Input Voltage Range: Configurable differential or single-ended inputs capable of handling signals up to plus or minus 10V or greater, with built-in programmable gain amplifiers.

• Phase Match Precision: Tight inter-channel phase matching, typically within 1 degree or less, which is critical for simultaneous sampling and spatial orientation calculations.

Product Advantages

NI Filter Modules stand out in the automated test industry due to their hardware-software synchronization and precise analog designs:

• Real-Time Anti-Aliasing Protection: Automatically scales filter cutoff frequencies based on the active sampling rate, ensuring foolproof protection against high-frequency spectral overlapping.

• Software-Defined Programmability: Fully manageable through the NI-DAQmx driver framework and LabVIEW environment, allowing users to modify filter types, cutoff points, and gains on-the-fly without changing physical components.

• Noise and Ripple Reduction: Significantly reduces wideband background noise and power-line interference, maximizing the signal-to-noise ratio (SNR) and dynamic range of connected digitizers.

• Flexible Signal Conditioning Integration: Often combines filtering with other essential conditioning features such as sensor excitation (for IEPE accelerometers or strain gauges), AC/DC coupling, and differential amplification.

• Scalable Modular Footprint: Fits into standardized compact chassis, enabling engineers to construct highly customized, high-channel-count setups alongside other specialized test instruments.

Product Applications

These modules are deployed extensively in precision measurement and high-fidelity testing environments:

• Sound and Vibration Analysis: Filtering high-frequency noise from microphones, hydrophones, and accelerometers in NVH (Noise, Vibration, and Harshness) testing.

• Structural Health Monitoring: Eliminating structural vibrations and electrical noise when measuring mechanical stress, fatigue, and strain on bridges, aircraft wings, and wind turbines.

• Aerospace and Defense Testing: Conditioning dynamic telemetry data, engine acoustics, and structural impact signals during rigorous system validation processes.

• Biomedical Engineering: Preamplifying and filtering low-frequency, low-amplitude physiological signals like ECG or EEG from ambient electromagnetic fields.

• RF and Wireless Communication: Attenuating harmonic distortions and adjacent channel emissions in software-defined radio (SDR) and radar prototyping platforms.

Important Precautions

To preserve signal clarity and prevent hardware degradation, users must observe the following technical guidelines:

• Ground Loop Prevention: Use differential wiring whenever possible for analog sensor inputs and ensure proper shielding, as ground loops can introduce common-mode noise that bypasses filter baselines.

• Insertion Loss Adjustment: Be aware that analog active filters can introduce small insertion losses or DC offsets. Utilize NI-DAQmx calibration functions to zero out offsets prior to running critical test routines.

• Phase Shift Considerations: High-order filters inherently introduce frequency-dependent phase delays. When evaluating timing relationships across different channels, account for this delay or use linear-phase Bessel filters.

• Thermal Stabilization: To achieve specified filtering precision and minimize component drift, allow the module and its host chassis to run and thermally stabilize for at least 15 to 30 minutes before taking data.

• Live Swapping Constraints: Always reference the specific C Series or PXI module manual regarding hot-swapping. While many modern NI architectures support live module changes, sudden insertion into a faulty backplane slot can compromise logic state settings.

The structure and details of the product：

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Shipping Port:  China

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Warranty: one year

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