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GB/T 14255-2015 English PDF

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GB/T 14255-2015: Household sewing machines head -- Method of sound power levels of noise emitted
Status: Valid

GB/T 14255: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 14255-2015English299 Add to Cart 3 days [Need to translate] Household sewing machines head -- Method of sound power levels of noise emitted Valid GB/T 14255-2015
GB/T 14255-1993English439 Add to Cart 4 days [Need to translate] Method of sound power levels of noise emitted by household sewing machine head Obsolete GB/T 14255-1993

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Basic data

Standard ID GB/T 14255-2015 (GB/T14255-2015)
Description (Translated English) Household sewing machines head -- Method of sound power levels of noise emitted
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard Y17
Classification of International Standard 61.080
Word Count Estimation 14,185
Date of Issue 2015-09-11
Date of Implementation 2016-04-01
Older Standard (superseded by this standard) GB/T 14255-1993
Quoted Standard GB 3102.7-1993; GB/T 3241-2010; GB/T 3785-2010; GB/T 3947-1996; JJG 176-2005; JJG 188-2002
Regulation (derived from) National Standard Announcement 2015 No.25
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This Standard specifies above a reflecting plane free field acoustic test environment on the surface of a measuring envelope illusion household sewing machine head of measured sound pressure level, sound power level calculated method results. This Standard applies to household sewing machine head sound power level testing.

GB/T 14255-2015: Household sewing machines head -- Method of sound power levels of noise emitted

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(Test Method for household sewing head sound power level) ICS 61.080 Y17 National Standards of People's Republic of China Replacing GB/T 14255-1993 Household sewing machine head Test Method for the sound power level Issued on. 2015-09-11 2016-04-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard replaces GB/T 14255-1993 "Test Method for household sewing machine head sound power level", and GB/T 14255- Compared to 1993, the main changes are. --- Original standard format prepared by the GB/T 1.1-2009 requested to prepare; --- Original standard "Normative references" has been modified, citing the latest versions of these files. The standard proposed by China National Light Industry Council. This standard by the China Sewing Machinery Standardization Technical Committee (SAC/TC152) centralized. Drafting of this standard. National Sewing Machine Quality Supervision and Inspection Center, Shanghai Institute of sewing machines, sewing machine Zhejiang new shares leap Limited copies. The main drafters of this standard. Wang Weigang, Zhang Weiqing, Yepu Chang. This standard replaces the standards previously issued as follows. --- GB/T 14255-1993. Household sewing machine head Test Method for the sound power level

1 Scope

This standard specifies above a reflecting plane for the free field acoustic test environment, the illusion of a home sewing machine head envelope Measured on a measuring surface sound pressure level, sound power level has been calculated method results. This standard applies to household sewing machine head sound power level testing.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB 3102.7-1993 Quantities and units of acoustics GB/T 3241-2010 octave and fractional octave filters Electricity GB/T 3785-2010 sound level meter, acoustic performance and test methods GB/T 3947-1996 Acoustics Terminology JJG176-2005 acoustic calibrator verification procedures JJG188-2002 sound level meter verification procedures

3 Definitions and symbols

GB 3102.7-1993, terms and definitions GB/T 3947-1996 defined apply to this document.

4 measurements and measurement error

4.1 Measurement Project Measurements include. a) machine head noise A-weighted sound power level; b) 1/1 octave band or 1/3 octave noise machine head band spectrum analysis (when requested); c) the machine head noise directivity index (when requested). 4.2 Measurement error Measurement error should meet the following requirements. a) engineering method. For radiation within the frequency range of 100Hz ~ 10000Hz uniform spectral density of the machine head, measuring A-weighted sound The standard deviation of power level should be less than 2dB. Measuring 1/1 octave band sound power level or the standard deviation of not more than one-third octave band Table 1 The requirements. b) quasi-engineering method. For radiation in the frequency range 100Hz ~ 10000Hz uniform spectral density of the machine head, measuring A meter

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