The method for verifying the noise emission values that are declared. How acoustical and product information is to be supplied to users, The statistical upper-limit A-weighted sound power level (LWA,c) The statistical adder for verification (Kv) The declared mean A-weighted emission sound pressure level (LpA,m) The declared mean A-weighted sound power level (LWA,m) This standard applies to information technology and telecommunications equipment and specifies:įor a batch of equipment, the method for determining the values, The standard used for the declaration of acoustic noise emissions of IT equipment is the ISO 9296:2017 Acoustics – Declared noise emission values of computer and business equipment. ISO 7779 simplifies such comparisons and is the basis for the declaration of the noise emission levels of ITT equipment. These diverse practices have, in many cases, made a comparison of noise emissions difficult. A wide variety of methods have been applied by manufacturers and users to satisfy specific equipment or application needs. Methods for the measurement of airborne noise emitted by information technology and telecommunications (ITT) equipment, such as the laptop, are specified in ISO 7779:2018 Acoustics - Measurement of airborne noise emitted by information technology and telecommunications equipment. The sound power level is the preferred measurement as it is consistent, comparable, and more useful for noise control engineering – results are usually reported in dB. The sound power of products (LW) needs to be measured to adhere to international standards and legislation. Sound Power is defined as the total sound energy radiated by a sound source per unit of time, and the unit of measurement is the watt. Sound power is therefore useful to quantify the noise of a product. Unlike sound pressure, sound power does not depend on the acoustics of the surroundings, the noise from other sources or a specific measuring position. Sound pressure is the measurable effect, but sound power is the cause. Sound sources such as machinery radiate acoustic power, and this creates sound pressure. Solutions by industry Aerospace Automotive Civil Engineering Education E-mobility Heavy Machinery Industrial Maritime Power and Energy RailwayĪll solutions ADAS Testing Brake Noise Testing Brake Testing Structural Health Monitoring of Bridges Combustion Measurement Machine Condition Monitoring Electric Motor and Inverter Testing Electric Vehicle Testing Fatigue Testing FFT Spectrum Analyzer Harsh Environment Testing Human Body Vibration - ISO 2631 Modal Testing and Modal Analysis Octave Band Analyzer Orbit Analysis Order Analysis Ground Station Telemetry Power Analyzer Power Quality Analyzer Power Transformer Testing Renewable Energy Testing RT60 Measurement Road Load Data Acquisition Torsional Vibration Analysis Rotor Balancing Shock Response Spectrum Sine Reduction Test Sound Level Measurement Sound Intensity Measurement Sound Power Measurement Sound Quality Measurement Structural Health Monitoring Temperature Recording Vehicle Dynamics Testing Voltage Data Loggers Wind Turbine Monitoring Wind Power Quality Solution by area Acoustics Data Recording Flight/Space Testing Monitoring NVH Testing Electrical Power Testing Rotating Machinery Structural Dynamics Vehicle Testing Vibration Analysis
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