O-Solution DS-5000 Sound Power Level Measurement System

UPDATE 2026

The acoustic power level is the total amount of acoustic energy radiated by a sound source into the air per unit time. While the general sound pressure level varies depending on the distance from the noise source and the measurement environment, the acoustic power level is uniquely determined with respect to the noise source. Therefore, the acoustic power level is effective for setting noise specifications and evaluation criteria for equipment, as well as for evaluating noise reduction effects, and it is a global indicator used in environmental labels and noise regulations in various countries.

The measurement methods for acoustic power level are defined by ISO standards and JIS. The measurement principles include the sound pressure method using a microphone and the SI method using an acoustic intensity probe.

The flow of measuring the acoustic power level using the sound pressure method in a semi-anechoic chamber is shown in the figure below. Prepare a test environment and microphone arrangement in accordance with the standards, and obtain the sound pressure levels at each measurement point (background noise, target sound source, and reference sound source if environmental correction is applied).
After that, calculate the acoustic power level by adding the correction items specified by the standards.

Easily perform measurements according to standards and output reports in Excel format.
The settings for standards can be customized, which is helpful for individual standard calculations.

Generally, the calculation of acoustic power levels is performed within the frequency range of 100 Hz to 10 kHz as specified by standards, but it is possible to extend this frequency range for analysis in both low and high frequencies.
If there are many measurement points, multiple split measurements are possible ^※1.

After calculating the acoustic power level according to the standards, detailed analysis can be performed using the recorded data.
In the post-analysis, FFT and instantaneous acoustic power levels can be calculated, efficiently identifying frequency peaks and timings that contribute to the increase in acoustic power level, as well as the location of the sound source.
This allows for cause analysis without the hassle of re-measurement, leading to cost reduction in noise testing.

*1 Available when the sound source is reproducible and stable.
*2 Although standard background noise correction and area correction are performed, the values are reference values and not compliant with standards due to calculations at different frequency resolution or time resolution than the standard.
*3 If calculating the acoustic power level using the FFT frequency resolution, the OS-0522 FFT analysis function is required separately.

The sound power level is standardized to be measurable in various environments without limiting the subject. OS-0541 corresponds to the standard for measuring sound power levels using the sound pressure method with a microphone. Additionally, the OS-0524 octave analysis function is required.

ISO 3744:2025, Acoustics ─ Determination of sound power levels of noise sources using sound pressure ─ Engineering methods for an essentially free field over a reflecting plane

The measurement of sound power levels is governed by several international standards depending on the required accuracy (grade) and measurement environment. Among these, ISO 3744 is the most widely cited practical method (Grade 2), with techniques such as measurement at 10 points on a hemispherical surface being representative.
This ISO 3744 has been revised for the first time in 15 years, with the new version set to be released in December 2025.

The recent revision has streamlined complex regulations and simplified the main text of the standard. Additionally, changes have been made regarding environmental corrections and criteria for determining background noise. Please refer to the table below for the main changes.
The DS-5000 Sound Power Level Measurement System has quickly adapted to this latest revision.
It provides highly accurate measurements that are always compliant with the latest standards.

Main revisions of ISO 3744

This is the configuration of a measurement system with 10 points arranged on a general hemispherical surface.

* A separate computer is required. Recommended specifications follow O-Solution's specifications.
* A separate microphone stand or similar is required for fixing the microphone. Please consult us.
* If selecting and arranging a microphone stand or similar, a separate system operation confirmation fee will be charged.

To conduct sound power level measurements in accordance with specifications, it is necessary to confirm that the testing environment and measurement methods are suitable for the customer's test specimen. Our company utilizes the technology cultivated through contracted measurements and noise reduction consulting to provide services that allow customers to measure with confidence. Please consult us for details about our follow-up services.

The construction of anechoic chambers and the production of micro-horn domes can be provided by Japan Acoustic Engineering Co., Ltd., which has top-class achievements in the country. The company possesses high technical skills in a wide range of fields, from the design and construction of acoustic spaces that meet diverse needs to noise control and support for the development of acoustic materials.

For inquiries regarding acoustic power level measurement devices or general information about testing rooms, please click here.
For inquiries about the construction of anechoic chambers, microphone domes, etc., please use the contact form of Japan Acoustic Engineering Co., Ltd. (this will take you to an external site).

By measuring according to specifications, you can more accurately grasp the overall sound of the product.

Air conditioning equipment, home appliances (washing machines, vacuum cleaners, etc.), multifunction devices, automotive parts (motors), generators, and other machinery.

By checking the sound power level and the sound pressure level distribution simultaneously, it is possible to efficiently identify the sound source and verify the effectiveness of countermeasures.

Devices with built-in motors tend to generate high-frequency sounds associated with rotational speed. Since high-frequency sounds can sometimes be unpleasant, efforts to reduce noise are important. With OS-0541, it is possible to calculate the acoustic power level of tracking analysis by post-analyzing measurement data. By comprehensively understanding the acoustic power levels corresponding to rotational speeds, it clarifies the operational conditions that need to be addressed. An additional OS-0523 tracking analysis function is required.