ISO 3743-1:2010

Overview

ISO 3743-1:2010 - Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Part 1: Comparison method for a hard-walled test room - specifies an engineering-grade method for determining the sound power level and sound energy level of small, movable noise sources. The standard uses a comparison method: measured sound pressure levels from the test source in a prescribed hard-walled test room are compared with those from a calibrated reference sound source. Results are reported in one-octave frequency bands and can be combined to give A-weighted values.

Key topics and technical requirements

• Test environment: measurements are made in a hard-walled reverberant test room with defined acoustical characteristics; maximum source size is limited by room dimensions.
• Comparison method: sound power/energy is calculated from the difference between octave-band sound pressure levels of the test source and a reference source operated in the same room.
• Frequency range: nominal octave bands from 125 Hz to 8 000 Hz (extension down to 63 Hz allowed with caveats).
• Types of noise: suitable for steady, non-steady, fluctuating, burst or transient noises as defined in ISO 12001.
• Output formats: octave-band sound power levels and sound energy levels; derived A-weighted levels from those bands.
• Measurement uncertainty: uncertainty guidance is provided and conforms to ISO 12001:1996 accuracy grade 2 (engineering grade).
• Instrumentation and references: normative references include ISO 6926 (reference sources), IEC 60942 (calibrators), IEC 61672-1 (sound level meters) and IEC 61260 (filters).

Practical applications

• Determining the acoustic emission of portable machinery, appliances, components and sub-assemblies during product development, quality control and comparative testing.
• Evaluating noise emissions for product labeling, procurement specifications, or engineering design where laboratory-level (engineering-grade) accuracy is adequate.
• Measuring transient events (sound bursts) by reporting sound energy levels instead of continuous sound power.
• Benchmarking and troubleshooting noisy equipment in R&D or test laboratories using a hard-walled reverberant room.

Who should use ISO 3743-1:2010

• Acoustic test laboratories and in-house test facilities
• Product manufacturers (small appliances, portable equipment) and R&D teams
• Noise consultants and acoustic engineers performing emission testing
• Quality assurance specialists and procurement engineers comparing equipment noise performance

Related standards

• ISO 3740–3747 series (methods for sound power determination)
• ISO 3743-2 - Methods for special reverberation test rooms
• ISO 3741, ISO 9614 (higher-accuracy methods)
• ISO 12001 (noise test code rules)
• ISO 6926, IEC 60942, IEC 61672-1, IEC 61260

ISO 3743-1:2010 is practical for engineers and acoustic professionals who need an established, repeatable method to derive octave-band and A-weighted sound power/energy values for small, movable sources in a controlled reverberant environment.