ISO 10302-2:2011

Overview

ISO 10302-2:2011 - "Acoustics - Measurement of airborne noise emitted and structure‑borne vibration induced by small air‑moving devices - Part 2: Structure‑borne vibration measurements" specifies test methods for measuring the structure‑borne vibration that small air‑moving devices (AMDs) induce in average structures used in information technology and telecommunications (ITT) equipment. The standard applies to AMDs with mounting footprints up to 0.48 m × 0.90 m (full‑size plenum) and 0.18 m × 0.30 m (half‑size plenum), and defines measurement descriptors, instrumentation, test‑fixture design, operating conditions and reporting requirements.

Key topics and requirements

• Scope & descriptors
  • Measures vibration in one‑third‑octave bands from 25 Hz to 5 kHz and reports the overall unweighted energy‑average vibratory acceleration level (useful proxy for A‑weighted structure‑borne noise).
• Test fixture and mounting
  • Uses the plenum design of ISO 10302‑1 with a specified damped panel (mechanical mobility ~ −45 dB reference 1 m/N·s across 25 Hz–5 kHz with defined tolerances).
  • Specifies mounting clearances and recommends through‑screws (e.g., M3.5 tightened to 0.34 Nm) unless manufacturer instructions differ.
• Operating conditions
  • Defines test points (open slider, ~80% and ~20% of max flow) and limits such as static pressure ≤ 750 Pa and prescribed flow‑rate scaling consistent with ISO 10302‑1.
• Instrumentation & calibration
  • Requires accelerometer systems flat within ±1.0 dB (20 Hz–6 300 Hz) and calibrated per ISO 16063 methods.
• Measurement uncertainty
  • Encourages evaluation per ISO/IEC Guide 98‑3 (GUM). Provides provisional reproducibility estimates and guidance for reporting expanded uncertainty.
• Reporting
  • Prescribed test report content and suggested data formats (Annex A–D provide example formats, recommended voltages and uncertainty guidance).

Applications

• Product acoustic qualification and R&D for small fans, blowers and other AMDs used in:
  • Servers, desktop and consumer electronics, telecom equipment racks, and other ITT environments.
• Supplier quality control: obtain per‑unit induced vibration data to compute statistical production values.
• Design trade‑offs: correlate induced acceleration levels with radiated structure‑borne noise to improve enclosure/support designs.

Who should use this standard

• Acoustic engineers, test lab personnel, product designers of AMDs and ITT equipment, and quality/acceptance teams requiring reproducible structure‑borne vibration data for small fans and blowers.

Related standards

• ISO 10302‑1 (Airborne noise measurement)
• ISO 266 (Preferred frequencies)
• ISO 5348 (Accelerometer mounting)
• ISO 16063‑11/21 (Transducer calibration)
• IEC 61260 (Fractional‑octave filters)
• ISO/IEC Guide 98‑3 (Uncertainty - GUM)

Keywords: ISO 10302-2:2011, structure‑borne vibration, small air‑moving devices, AMDs, vibration measurement, accelerometer, test plenum, ITT equipment, measurement uncertainty.