Test method for the determination of noise emitted by office equipment

Material testing for the determination of noise emitted by office equipment in order to provide methods for manufacturers and laboratory testing to obtain comparable results; quality control during production, optimizing the research and development of standard-compliant equipment, superior noise reduction...

Content overview of Material testing for the determination of noise emitted by office equipment

Name of the material testing: Acoustics – Measurement of airborne noise emitted by information technology and telecommunications equipment [1].

Test method:

ISO 7779:2010: Acoustics – Measurement of airborne noise emitted by information technology and telecommunications equipment [1].

Performed at: Laboratory, DASM Institute of Acoustics.

1. Objectives and test objects

– Scope and test objectives

This standard specifies procedures for measuring and reporting noise emitted by information technology and telecommunications equipment.

The basic emission quantity is the A-weighted sound power level, which can be used to compare equipment of the same type from different manufacturers or to compare different equipment.

Three basic noise emission standards for determining sound power levels are specified in this standard. International standards to avoid excessive restrictions on existing facilities and experience. ISO 3741 specifies comparison measurements in a reverberation test room; ISO 3744 and ISO 3745 specify measurements in an essentially free field over a reflecting plane. Any one of these three basic noise emission standards may be selected and used individually according to this International Standard when determining the sound power level of the machine.

The A-weighted sound power level is supplemented by the A-weighted emission sound pressure level determined at the operator position(s) or bystander position(s), based on the basic noise emission standard ISO 11201. This sound pressure level is not a worker entry prohibition rating level, but it can help identify any potential issues that may cause annoyance, hinder operation, or damage hearing for operators and bystanders.

Methods for determining whether the emitted noise includes prominent discrete tones or impulse characteristics are specified in Appendices D and E, respectively.

This standard is suitable for type tests and provides methods for manufacturers and laboratory testing to obtain comparable results.

The methods specified in this standard allow the determination of noise emission levels within a functional unit tested individually.

The procedures apply to equipment emitting broadband noise, narrowband noise, and noise containing discrete frequency components or impulse noise.

The obtained sound power and emission sound pressure levels can serve for noise declaration and verification purposes. Comparison purposes (see ISO 9296).

If the obtained sound power levels are determined for several functional units of the same production series, they can be used to determine statistical values for that production series (see ISO 9296).

– Test objects:

Information technology and telecommunications equipment used in offices: desktop computers, laptops, iPads, printers, projectors, speakers... 

2. Experimental procedure

– Test methods

• Determination of sound pressure in reverberant rooms.
• Method for determining the sound power level of equipment under basic conditions of a free field over a reflecting plane.
• Method for determining the emission sound pressure level at specified operator and bystander positions.

– Implementation steps:

• Fully equip with devices, microphones, and test objects.
• Perform sample measurements.
• Process and report results.

 

Role – importance of Material testing for the determination of noise emitted by office equipment

Material testing for the determination of noise emitted by office equipment performed by the DASM Institute of Acoustics helps provide useful information, meeting all practical needs of customers and businesses wishing to:

• Proactively control noise.
• Report the impact of noise.
• Provide methods for manufacturers and laboratory testing to obtain comparable results.
• Determine noise emission levels, thereby controlling and monitoring quality during production, optimizing the research and development of standard-compliant, superior equipment.
• Propose and implement solutions prioritizing types of equipment with improved techniques and technologies capable of noise reduction.

Simultaneously, DASM will conduct consulting and design work to create shape/structure/material solutions to optimize the noise reduction function of the test sample.

If previously you had lingering concerns, worries, and had to spend many costs for similar activities abroad, now you only need to contact DASM. The entire remaining process will be proactively implemented by us as a turnkey service in the fastest time to complete the customer experience about us: DASM provides acoustic consulting services with truly superior quality, competitively priced in the industry along with thoughtful and dedicated customer care policies.

The significance of acoustic material testing services at DASM

Today's globalized commercial life opens up countless new markets and supply sources across five continents. Accompanied by it are international regulations and standards helping customers easily evaluate quality – trace product origin, select suitable/superior items. Especially, they support manufacturers in continuously improving and perfecting technology, techniques, raw materials, production and sales methods... etc...

DASM Institute of Acoustic Materials Development & Application is a pioneer, comprehensive, professional, and leading reputable brand in Vietnam in the field of acoustics. On January 12, 2023, DASM was granted certificate number 114/TĐC – HCHQ by the Directorate for Standards, Metrology and Quality (Ministry of Science and Technology), certifying the registration of testing activities for multi-sector synthesis in the field of Mechanics - Physics (registration number: 707/TN – TĐC).

Our acoustic testing services provide clients with practical professional results to meet sustainability, standard performance, and optimal solutions - consulting - design adjustments for products and services. From there, you will update, meet, and adapt to constantly changing international standards to achieve breakthroughs in revenue, profit, and elevate your brand.

For customers wishing to carry out Testing method: Determination of noise emitted from office equipment please contact via Hotline for detailed consultation!