NI PXIe-4492 – 8‑Channel Dynamic Signal Acquisition for Sound & Vibration

The NI PXIe-4492 is a PXI Express dynamic signal acquisition (DSA) module built for sound, vibration, and rotating machinery measurements. From my experience, teams choose it when they need true simultaneous 24-bit acquisition across multiple channels without juggling external conditioners. Each of the eight channels supports AC/DC coupling and IEPE sensor excitation, which typically means you can connect accelerometers and microphones directly over BNC and get stable, low-noise data up to 204.8 kS/s per channel.

Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week for in-stock items; no more than one month at the latest
• Payment terms: 50% advance payment; full payment before delivery
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Key Features

• Eight simultaneous analog inputs – 24‑bit delta‑sigma conversion on each channel helps capture detailed spectra for NVH, acoustics, and structural testing.
• Up to 204.8 kS/s per channel – A common choice for wideband vibration and audio; anti‑aliasing filters track the sample rate automatically.
• IEPE sensor support – Per‑channel IEPE excitation makes it straightforward to connect accelerometers and microphones without external conditioners.
• AC/DC coupling selectable – Switch between AC for vibration and DC for general voltage signals; saves re‑wiring time when test setups change.
• Low noise floor – In many cases, you can see small spectral components that lower‑grade DAQ cards smear or bury in noise.
• BNC front connectors – Simple, rugged connections for lab and field use; easy to route with standard coax.
• PXI Express timing and sync – Tight module‑to‑module synchronization via the PXIe backplane and NI‑TClk for multi‑module systems.
• Software ecosystem – Works with NI‑DAQmx; typically used in LabVIEW, Python, or C/C++ for quick integration into existing benches.

Technical Specifications

Related or Supporting Products

• NI PXIe-4496 – Similar architecture with more channels (typically 16 AI) for higher‑density vibration test racks.
• NI PXIe-4464 – 4‑channel, 24‑bit DSA; useful when you need fewer channels with the same sample rate class.
• NI PXIe-1071 / PXIe-1082 – PXI Express chassis options; pick based on slot count and bandwidth needs.
• NI PXIe-8880 – Embedded PXIe controller for deterministic, high‑throughput data logging.
• Cabling & Sensors – Shielded BNC coax, IEPE accelerometers, and condenser microphones typically pair well with the PXIe‑4492.

Installation & Maintenance

• Cabinet & chassis – Mount in a ventilated PXI Express chassis with unobstructed airflow. Keep ambient within 0–55 °C and avoid dust accumulation around the intake/exhaust.
• Wiring practices – Use shielded BNC cables; route sensor leads away from power lines. When IEPE is enabled, verify sensor polarity and cable integrity to avoid false baselines.
• Grounding & safety – Ensure the chassis earth ground is solid. Do not exceed the rated input range; disconnect sensor power before re‑wiring.
• Calibration – Annual calibration is typically sufficient for most labs. For compliance or critical NVH work, 6‑month intervals can help keep traceability tight.
• Software & firmware – Keep NI‑DAQmx drivers up to date. You might notice improved filter handling and sync features in newer revisions.
• Routine care – Inspect BNC connectors for wear, clean with isopropyl if needed, and check IEPE bias readings as a quick sensor‑health test.

Quality & Certifications

NI hardware is manufactured under ISO 9001 quality systems and typically carries CE and RoHS compliance. PXI system components are designed to meet relevant EMC and safety standards for industrial and laboratory environments. The manufacturer’s standard limited warranty is generally 1 year; sales coverage from us is 365 days as stated above.