O-Solution DS-5000 Sound Power Level Measurement System

Ono Sokki Co., Ltd. (President: Yuji Okoshi), a manufacturer and distributor of electronic measuring instruments, will begin selling the "O-Solution DS-5000 Sound Power Level Measurement System," which contributes to noise reduction in all types of industrial products, on Thursday, April 23, 2026.

This system is an upgraded version of the measurement system that combines the application software "OS-0541 Sound Pressure Method Acoustic Power Level" released in February 2024 with Sound and Vibration Analysis System "O-Solution・DS-5000". It is the first to comply with the newly revised international standard ISO 3744:2025, which has been revised for the first time in 15 years. Furthermore, by enabling wideband measurement that exceeds the standard range, it supports measurement of a wide frequency range, from low-frequency noise from construction machinery and compressors to high-frequency noise from motors and inverters, which is a challenge in the automotive sector. In addition, because it is possible to easily visualize the sound source and frequency peaks, it improves the efficiency of analysis work and contributes to reducing the workload of engineers.

Acoustic power level: This is an index that indicates the total amount of sound energy radiated by a sound source. It can be evaluated as an absolute noise value, unaffected by the measurement location or environment. This value is a widely used global index for indicating operating noise in environmental labels (Eco Mark, Blue Angel), noise regulations, and product catalogs for equipment. The measurement method is defined by international standards.

Three points

• Compliant with the latest international standard, ISO 3744:2025.
• It is possible to calculate sound power levels that cover a wider bandwidth (low and high frequencies) than the standard.
• FFT analysis and sound pressure level distribution display allow for intuitive understanding of noise sources and causes.

Target Market

• Products that require particularly quiet operation, such as office equipment, air conditioning equipment, and home appliances.
• Next-generation mobility, such as eAxles installed in EVs, faces challenges in high-frequency bandwidth.
• Equipment that is predominantly low-frequency, such as construction machinery, generators, and outdoor machinery.

Background of Development

Acoustic power level can be measured as the total energy of sound emitted by equipment, and is therefore widely used as a guideline for measuring the actual operating noise of equipment and for noise reduction. This measurement method is defined by international standards, and for equipment distributed domestically and internationally, such as air conditioners, office equipment, and automotive parts, reliable measurement in accordance with the latest standards is essential. Therefore, this system has been promptly adapted to the latest international standard, ISO 3744:2025, which was revised for the first time in 15 years. Customers can perform highly reliable measurements in accordance with the latest standards.

Overview of the standard revision

For measuring sound power levels, several international standards have been established depending on the required accuracy (grade) and measurement environment. Among these, ISO 3744 is the most frequently cited standard for practical methods (grade 2), and typical methods include measuring at 10 points on a hemisphere.
ISO 3744 was revised in December 2025. This revision streamlined complex provisions and simplified the text of the standard. Changes were also made to the criteria for testing environments and background noise. (Please refer to our website for an overview of the revisions.)

Features

Compliant with the latest international standard, ISO 3744:2025.

This system allows you to measure acoustic power levels, an internationally recognized standard, in accordance with the latest regulations. Measurements can be easily performed and reports generated according to these standards.

Supports calculations up to 20 kHz (1/3 octave).

It supports a wider frequency range than the standard frequency range (100 Hz to 10 kHz) ^* 1. It can cover everything from low-frequency to high-frequency sounds and can be used for various applications such as customer-specific shipping inspections and quality checks.

Contributing to the analysis of the cause of bothersome noises

• Simultaneous recording

• FFT, instantaneous sound power level calculation ^*2

• Sound pressure level distribution display

This system allows for acoustic power level measurement and root cause analysis using a single software program. By observing acoustic power levels in more detail than standard octave-by-octave results, it is possible to efficiently identify the frequency peaks, timing, and location of sound sources that cause noise. Root cause analysis can be performed without the need for remeasurement, leading to cost reductions in noise testing.

*1 The extension of the frequency range is contingent on the test environment supporting the extended frequency range.
*2 Although ambient noise correction and area correction are performed according to the standard, the calculation is performed with a more detailed frequency/time resolution than the standard, so it is not strictly compliant with the standard but is a reference value.

Corresponding international standards

It complies with the sound pressure method standard for acoustic power levels using microphones. An optional add-on allows for measurement of radiated sound from office equipment (such as multifunction printers and printers).

OS-0541 Sound Pressure Method Acoustic Power Level

OS-0542 Radiation Sound Measurement Option (Information Technology Equipment)