GB/T 4214.1-2000 English PDF (GBT4214.1-2000)

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GB/T 4214.1-2000: Acoustics. Household and similar electrical appliances. Test code for determination of airborne acoustical noise. Part 1: general requirements
GB/T 4214.1-2000
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.140.20
Z 32
eqv IEC 60704-1.1997
Replacing GB/T 4214-1984
Acoustics – Household and Similar
Electrical Appliances – Test Code for Determination of
Airborne Acoustical Noise – Part 1. General Requirements
ISSUED ON. MARCH 16, 2000
IMPLEMENTED ON. DECEMBER 01, 2000
Issued and Approved by. State Bureau of Quality-Technical Supervision
Table of Contents
Foreword ... 3
IEC Foreword ... 4
Introduction ... 5
1 Scope and Object ... 6
2 Normative References ... 8
3 Terms and Definitions ... 9
4 Measurement Methods and Acoustical Environments ... 10
5 Instrumentation ... 12
6 Operation and Location of Appliances under Test ... 13
7 Measurement of Sound Pressure Levels ... 17
8 Calculation of Sound Pressure and Sound Power Levels ... 24
9 Information to be Recorded ... 28
10 Information to be Reported ... 31
Figure 1 -- Measurement Surface – Parallelepiped –– with Key Microphone
Positions, for Floor Free-Standing Appliances ... 18
Figure 2 -- Measurement Surface – Parallelepiped – with Key Microphone
Positions, for Floor Standing Appliances Placed against a Wall ... 19
Figure 3 -- Measurement Surface – Parallelepiped – with Key Microphone
Positions, for High Floor-Standing Appliances Placed against a Wall ... 20
Figure 4 -- Measurement Surface – Hemisphere – with Key Microphone
Positions, for Hand-Held, Table Type and Floor-Treatment Appliances ... 21
Figure 5 – Measurement Surface – Quarter-Sphere – with Key Microphone
Positions, for Small Floor-Standing Appliances Placed Against a Wall ... 21
Figure 6 -- Measurement Surface – Parallelepiped – with Five or Nine
Microphone Positions for Standard-Type Appliances ... 22
Appendix A ... 33
Foreword
This Standard is the modification against the GB/T 4214-1984 according to the
international standard IEC 60704-1.1997 Acoustics – Household and Similar Electrical
Appliances – Test Code for Determination of Airborne Acoustical Noise – Part 1.
General Requirements. This Standard is equivalent to such international standard in
the aspect of technical contents.
Due to the wide variety of household electrical appliances, there are emerging more
new types and uses of electrical appliances, it requires for huge workload and the
standard system itself may also be messy if preparing an independent noise test
standard against each product. Therefore, IEC 60704-1.1997 adopts the following
methods, namely, the household electrical appliance’s noise test standard can be
divided into two parts. Part 1 is general requirements, which is applicable to all
appliances; Part 2 is the particular requirements, which is prepared against certain
product (for instance. washing machine). Part 2 can be prepared basing on the Part 1
to add, delete, replace and adapt to certain items. Thus, the combined use of Part 1
and Part 2 constitute the integrate noise test standard of certain appliance. This
Standard adopts such preparation method. This Standard is Part 1 of serial standards
of Acoustics – Household and Similar Electrical Appliances – Test Code for
Determination of Airborne Acoustical Noise.
This Standard replaced GB/T 4214-1984 since the effective date.
The Appendix A of this Standard is a standard one.
This Standard was proposed by Chinese Academy of Sciences.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Acoustics.
Drafting organizations of this Standard. China Household Electrical Appliances
Research Institute, and Guangzhou Electric Apparatus Research Institute.
Chief drafting staffs of this Standard. Yang Weicheng, and Xu Qingfang.
This Standard was first-time published on March 24, 1984.
Introduction
Although the noise emitted by household appliances does not generally present a
hazard to the hearing of the operator and other exposed persons, the need for
standardization procedures for the determination of the noise emitted has been
recognized for a long time. Such procedures should be specified, not only for special
types of appliances, but also the principles should be applicable to the majority of
appliances in general use.
Generally, the determination of noise levels is only part of a comprehensive testing
procedure covering many aspects of the properties and performances of the appliance.
It is therefore important that the requirements for noise measurements (such as test
environment, instrumentation, and amount of labor involved) should be kept at a
modest level.
The results of noise measurements will be used for many purposes, for example for
noise declaration, as well as for comparing the noise emitted by a specific appliance
to the noise emitted by other appliances of the same family. In other cases, the results
will be taken as a basis for engineering action in the development stages of new pieces
of equipment, or in deciding on means for sound insulation. For all purposes, it is
important to specify procedures with known accuracy so that the results of
measurements taken by different laboratories can be compared.
These conditions have, as far as possible, been taken into account in the preparation
of this test code. The acoustic measuring methods are based on those described in
GB/T 3767, ISO 3743-1, and ISO 3743-2.
The adoption of these methods permits the use of semi-anechoic rooms, special
reverberation test rooms and hard-walled test rooms. The result of the measurements
is the sound power level of the appliance. Within the measuring uncertainty specific to
these methods, the results from the determination under free-field conditions over a
reflecting plane are equal to those obtained in reverberant fields. The use of intensity
methods as described in GB/T 16404 and GB/T 16404.2 is under consideration.
It should be emphasized that this test code is concerned with airborne noise only. In
some cases, structure-borne noise, for example transmitted to the adjoining room, m
ay be of importance.
Acoustics – Household and Similar
Electrical Appliances – Test Code for Determination of
Airborne Acoustical Noise – Part 1. General Requirements
1 Scope and Object
1.1 Scope
1.1.1 General
The general requirements (Part 1) of this Standard applies to electric appliances
(including their accessories or components) for household and similar use, supplied
from mains or from batteries.
By similar use is understood the use in similar conditions as in households, for example
in inns, coffee-houses, tea-rooms, hotels, barber or hairdresser shops, launderettes,
etc., if not otherwise specified in particular requirements (Part 2).
This standard does not apply to.
-- Appliances, equipment or machines designed exclusively for industrial or
professional purposes;
-- Appliances which are integrated parts of a building or its installations, such as
equipment for air conditioning, heating and ventilating (except household fans,
cooker hoods and free-standing heating appliances), oil burners for central
heating, pumps for water supply and for sewage systems;
-- Separate motors or generators;
-- Appliances for outdoor use.
1.1.2 Types of noise
A classification of different types of noise is given in ISO 12001. The method specified
in GB/T 3767 is suitable for measurements of all types of noise emitted by household
appliances. The methods specified in ISO 3743-1 and ISO 3743-2 are suitable for all
types of n...