BS ISO 10302-2 pdf download

BS ISO 10302-2 pdf download Acoustics — Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices Part 2: Structure-borne vibration measurements
1 Scope
This part of lSO 10302 covers vibration levels from small air-moving devices (AMDs) with mounting footprintsof less than 0,48 m × 0,90 m for the full-size test plenum defined in iso 10302-1 and less than 0,18 m × 0,3 mfor the half-size plenum.
lt covers all types of AMDs which can be mounted on, and are self-supported at, the discharge or inlet planeof a test plenum box as specified in lSO 10302-1.
The procedures defined in this part of lSO 10302 specify methods for determining the vibration levels that asmall AMD would induce in an average structure used in information technology and telecommunicationsequipment. The methods specified in this part of ISO 10302 allow the determination of induced vibration levelsfor the individual AMD that is tested. These data can be used to determine the statistical values of vibrationlevels for a production series if levels are measured for several units of that series.
2Normative references
The following referenced documents are indispensable for the application of this document.For datedreferences,only the edition cited applies. For undated references,the latest edition of the referenceddocument (including any amendments) applies.
ISO 266,Acoustics —Preferred frequencies
ISO 5348,Mechanical vibration and shock — Mechanical mounting of accelerometers
ISO 10302-1:2011，Acoustics — Measurement of airborne noise emitted and structure-borne vibrationinduced by small air-moving devices — Part 1 : Airborne noise measurement
ISO 16063-11，Methods for the calibration of vibration and shock transducers — Part 11: Primary vibrationcalibration by laser interferometry
ISO 16063-21,Methods for the calibration of vibration and shock transducers — Part 21 : Vibration calibrationby comparison to a reference transducer
IEC 61260,Electroacoustics — Octave-band and fractional-octave-band filters
ISO/IEC Guide 98-3,Uncertainty in measurement— Part 3: Guide to the expression of uncertainty inmeasurement (GUM:1995)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1 0302-1 and the following apply.
3.1
vibratory acceleration level
L a
ten times the logarithm to the base 1 0 of the ratio of the square of the root-mean-square acceleration, a, to the square of a reference value, a 0 , expressed in decibels where the reference value, a 0 , is 1 µm/s 2
NOTE 1 The width of the frequency band is stated; for example, overall for all bands in the frequency range of interest or one-third-octave band.
NOTE 2 Some other standards use other reference values.
NOTE 3 In this part of ISO 1 0302, ―vibratory acceleration level‖ is frequently referred to simply as ―acceleration level‖.
3.2
frequency range of interest
one-third-octave bands with centre frequencies specified in ISO 266, from 25 Hz to 5 kHz inclusive
3.3
information technology and telecommunications equipment
ITT equipment
equipment for information processing, and components thereof, used in homes, offices, server installations,telecommunications installations or similar environments
[ISO 7779:201 0 [3] , 3.1 .3]
NOTE ISO 1 0302 is intended to support the designers of ITT equipment.