Model Explanation

PXI: Standard 3U PXI bus, single slot, compatible with PXI/PXIe chassis.

4498: NI 449x series number, representing 16-channel analog input, 24-bit, 204.8 kS/s, IEPE, AC coupling, high-density acoustic vibration-specific.

Part Number: 779747‑01 (standard); 779747‑02 (with acoustic vibration measurement kit).

Technical Parameters (25℃, preheating 15 min)

Channels: 16 differential analog inputs, full-channel synchronous sampling.

ADC: 24-bit Σ‑Δ type.

Sampling Rate: Single channel up to 204.8 kS/s.

Dynamic Range: Typical 114 dB.

Input Voltage Range: ±316 mV, ±1 V, ±3.16 V, ±10 V.

Gain: 0 dB, +10 dB, +20 dB, +30 dB (software selectable).

Coupling: AC coupling, -3 dB cut-off 0.5 Hz (strong low-frequency performance).

IEPE Conditioning: Software controllable 4 mA constant current, compliant voltage 24 VNI.

Input Impedance: Voltage mode 100 kΩ; IEPE mode 10 kΩ.

Anti-aliasing Filter: Built-in programmable, automatically adjusted with sampling rate, no aliasing bandwidth 90 kHz.

THD+N: ≤‑100 dB; CMRR (1 kHz) >60 dB.

Trigger: Dual SMB external trigger, TTL level, rising/falling edge, minimum pulse width 10 ns.

Power Supply: PXI backplane power supply; maximum power consumption approximately 18 W.

Connectors: 2×InfiniBand 4x (each port 8 channels), can be converted to BNCNI.

Size/Weight: 3U single slot, approximately 320 g.

Environment: Operating 0～55℃; accuracy guaranteed 15～35℃; storage -20～70℃.

Calibration: Recommended 1 year, supported NIST traceability.

Interface and Communication Configuration

Front-end Interface

2×InfiniBand 4x: divided into two groups (AI0‑7, AI8‑15), a total of 16 analog inputs from NI.

2×SMB: trigger input/output, compatible with PFI/PXI trigger bus from NI.

Panel Indicator Lights

PWR (green): normal power supply.

RUN (green): constantly on = sampling in, flashing = waiting for trigger.

ERR (red): over-temperature, over-current or calibration error.

Bus and Synchronization

PXI bus, compatible with PXIe; supports PXI trigger, RTSI synchronization.

Multi-module synchronization skew <1 μs; single chassis up to 18 modules, synchronizing 288 channels.

Software Driver

NI‑DAQmx, supports LabVIEW, TestStand, Python, C#.

NI MAX: device identification, self-check, configuration, calibration.

Companion: Sound and vibration measurement kit, order analysis toolkit. Core function

16-channel synchronous acquisition: Full-channel synchronous delay < 1 μs, high-density multi-measurement point synchronous measurement.

Ultra-high dynamic range: 114 dB, simultaneously capturing weak and strong amplitude signals.

Integrated IEPE calibration: 4 mA constant current, directly driving IEPE accelerometers/microphones NI.

24-bit high precision + low noise: 204.8 kS/s, THD+N ≤ -100 dB, suitable for precise acoustic vibration measurement.

Low-frequency optimized AC coupling: 0.5 Hz cutoff, suitable for low-frequency vibration and noise monitoring.

TEDS intelligent sensor support: Automatically reads parameters, configures sensitivity, plug-and-play.

Large-scale system expansion: Multi-box cascading, synchronous over 13,000 channels, suitable for large arrays and structural testing. Applicable scenarios

Automobile NVH Testing: Measurement of multi-channel noise, vibration, and acoustic-vibration-rustiness for the entire vehicle / components (engine, transmission, suspension, body).

Large-scale Structural Modal and Health Monitoring: Multi-point modal analysis, impact response, resonance detection, and long-term monitoring for bridges, buildings, wind turbine towers, and large machinery.

Acoustic Array and Environmental Noise: Sound field analysis using microphone arrays, noise source localization, and multi-point environmental noise monitoring.

Industrial Equipment Condition Monitoring: Multi-point vibration acquisition for motors, fans, pumps, bearings, and gearbox; fault diagnosis and predictive maintenance.

Research and Teaching: Large-scale precision experiments in acoustic/vibration laboratories, multi-channel dynamic signal analysis in universities.

Installation and Power On

Install and power on, insert single slot and fix; the chassis should be reliably grounded to prevent static electricity.

Preheat for 15 minutes, perform NI MAX self-check to confirm no errors.

Ensure the chassis fan is normal and the ventilation ports are unobstructed, with the environment ≤ 55℃.

Connections and Operations

Connect sensors to NI using InfiniBand-to-BNC adapter (e.g., BNC-2144).

IEPE sensor channels should be set to 4 mA constant current; do not connect ordinary voltage signals.

AC coupling is suitable for AC/low-frequency signals; do not input > ±15 V voltage.

Set the gain to make the signal reach approximately 80% of the full scale to improve signal-to-noise ratio and avoid overload.

Use PXI triggering or RTSI bus for multi-module synchronization to reduce phase errors.

Maintenance and Calibration

Perform NIST traceable calibration once a year; enable internal self-calibration to compensate for temperature drift daily.

Clean the dust on the InfiniBand/SMB interface regularly, keep it dry; disconnect power and add a dust cap when the equipment is idle for a long time.

The working environment should be free of condensation, with a humidity of 5% to 95% RH; keep away from equipment with strong electromagnetic interference.

Do not plug or unplug cables while powered on; the IEPE channel should not be connected to electrostatic-sensitive equipment.