International Organization for Standardization (ISO)
Status
Latest
ISO 10302:1996
Scope
This standard specifies the measurement method of air noise radiated by small ventilation devices. This type of ventilation devices is primarily used for cooling electronic, electrical and mechanical equipment and includes propeller fans, axial fans, wing-type axial fans, centrifugal fans, cross-flow fans, cabinet blowers and variations of these devices. This standard describes methods and test equipment for the determination and reporting of airborne noise radiated by small ventilation devices as a function of the flow rate of the ventilation device and the static pressure developed by the ventilation device on the test equipment. This standard is intended for use by manufacturers of ventilation devices, manufacturers who use ventilation devices to cool electronic equipment and similar applications, and by laboratories that perform testing for these manufacturers. Test results obtained using this standard are expected to be used for engineering information and performance qualification, and this method may also be referenced in procurement technical specifications and contracts signed between buyers and sellers. The ultimate purpose of noise emission measurements is to provide data to designers of electronic, electrical or mechanical equipment that incorporates one or more ventilation devices. This standard can be used for the measurement of the total sound power level of small ventilation devices for cooling electronics and similar equipment. Test data shows that this method is effective for situations where the air flow is not greater than 1 m'/s and the fan static pressure is not greater than 750Pa. This standard is suitable for type testing and provides a method for manufacturers of ventilation devices, manufacturers of electronic and other application equipment, and measurement laboratories to obtain comparable results. The method specified in this standard refers to GB/T 18313-2001, which provides a method for measuring sound power level in an environment that meets specific requirements, that is, using a reverberation chamber comparison based on GB/T 6881.1 or GB/T 14367-2006 method or the direct method based on the approximate free field above a reflecting surface in GB/T 3767-1996 or GB/T 6882-1986. The methods specified in this standard are applicable to ventilation devices that radiate broadband noise, narrowband noise and noise with discrete frequency components. The method specified in this standard allows the determination of the noise emission level of a single device under test. If the noise emission levels of several devices of the same product series are measured, the method specified in GB/T 14573.4 or GB/T 18698 can be used to determine the statistical value of the product series. Note: In actual applications, vibration, turbulence, insertion loss and other phenomena will change the amount of radiated sound power, so the measurement results obtained according to this standard will be different from the measurement results after the ventilation device is installed on the equipment. Note: This standard does not describe the measurement of structure-borne sound generated by ventilation devices and does not include measurements of the aerodynamic performance of ventilation devices.
ISO 10302:1996 history
1996ISO 10302:1996 Acoustics - Method for the measurement of airborne noise emitted by small air-moving devices