Detail of GB/T 4214.8-2021

Introduction of GB/T 4214.8-2021

GB/T 4214 consists of the following 9 parts, under the general title Test method for noise of household and similar electrical appliances: ——General requirements (GB/T 4214.1); ——Particular requirements for vacuum cleaners (GB/T 4214.2); ——Particular requirements for dishwashers (GB/T 4214.3); ——Particular requirements for washing machines and spin extractors (GB/T 4214.4); ——Particular requirements for electric shavers (GB/T 4214.5); ——Particular requirements for electric hair care appliances (GB/T 4214.6); ——Particular requirements for washing machines and spin extractors(GB/T 4214.7); ——Particular requirements for electric cooking ranges, ovens, grills, microwave ovens and any combination of these(GB/T 4214.8); ——Particular requirements for fans (GB/T 4214.9). This part is Part 8 of GB/T 4214. This part shall be used in combination with GB/T 4214.1-2017. The clauses state "applicable", that means corresponding clauses of GB GB/T 4214.1-2017 are applicable to this part; when the clauses state "replacement" give priority to the clauses in this part; when the clauses state "addition", that means not only the corresponding clauses in GB/T 4214.1-2017, but also added clauses of this part shall be complied. This part is prepared in accordance with the rules given in GB/T 1.1-2009. The translation method used in this part is equivalent to IEC 60704-2-10:2011 Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-10: Particular requirements for electric cooking ranges, ovens, grills, microwave ovens and any combination of these. The following editorial changes have been made in this part: ——In order to unify the name of this series of standards, the name of this part is revised to Test method for noise of household and similar electrical appliances - Particular requirements for electric cooking ranges, ovens, grills, microwave ovens and any combination of these. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights. This part was proposed by the China National Light Industry Council. This part is under the jurisdiction of SAC/TC 46 National Technical Committee on Household Electric Appliances of Standardization Administration of China. Test method for noise of household and similar electrical appliances - Particular requirements for electric cooking ranges, ovens, grills, microwave ovens and any combination of these 1 Scope and object This clause of GB/T 4214.1-2017 is applicable except as follows. 1.1 Scope 1.1.1 General Addition: This part of GB/T 4214 requirements apply to electric cooking ranges, ovens, grills, microwave ovens and any combination of these for household and similar use. Note 101: These particular requirements do not apply to hobs due to lack of standardised load (pans) representative of normal use and ensuring a good repeatability of tests. For these applications, the loading and operating conditions are under consideration. This part does not apply to appliances or parts of appliances that use gas energy. 1.1.2 Types of noise Replacement: The methods specified in GB/T 6881.2, GB/T 6881.3 and GB/T 3767 can be used for measuring noise emitted by electric cooking ranges, ovens, grills, microwave ovens and any combination of these. 1.1.3 Size of the source Replacement: The method specified in GB/T 3767 is applicable to noise sources of any size. When applying GB/T 6881.2 and GB/T 6881.3, care should be taken that the maximum size of the appliance under test fulfills the requirements specified in 1.3 of GB/T 6881.2 and GB/T 6881.3. 1.2 Object Addition: The methods described are specified for appliances without an operator present. Requirements for the declaration of noise emission values are not within the scope of this part. Note 101: For determining and verifying noise emission values declared in product specifications, see IEC 60704-3. 1.3 Measurement uncertainty Replacement: The estimated values of standard deviations of sound power levels, determined according to this standard, see Table 101: Table 101 Standard deviations of sound power levels Standard deviation/dB σr(repeatability) σR(repeatability) 0.4 1.0 1.101 Standard deviation for declaration and verification For the purpose of determining and verifying declared noise emission values according to IEC 60704-3,the values indicated in Table 102 apply: Table 102 - Standard deviations for declaration and verification Standard deviation/dB σP (production) σT (total) σM (reference) 1.0~1.7 1.4~2.0 2.0 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. This clause of GB/T 4214.1-2017 is applicable except as follows. Addition: ISO 7235 Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal units - Insertion loss, flow noise and total pressure loss 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. This clause of GB/T 4214.1-2017 is applicable except as follows. Addition: 3.101 cooking range appliance having a hob and at least one oven; it may incorporate a grill [IEC 60350:19991), definition 3.1] 3.102 hob appliance or part of an appliance which incorporates one or more cooking zones [IEC 60350:1999, definition 3.2] Note 101: A hob is also known as a cook top. 3.103 oven appliance or compartment of a cooking range in which food is cooked by radiation, by natural convection, by forced-air circulation, by steam or by a combination of these heating methods [IEC 60350:1999, definition 3.10] 3.104 grill appliance or part of an appliance in which food is cooked by radiant heat [IEC 60350:1999, definition 3.9] 3.105 steam function function by which food is heated with steam up to boiling temperature of water at ambient pressure 3.106 hot steam function function by which food is heated with hot steam (T>100 °C) at ambient pressure [Amendment 1:2005 of IEC 60350:1999, definition 3.18 modified] 3.107 forced air circulation function heat transmission to the food by forced air convection, i.e. circulating the air with the help of a fan [Amendment 1:2005 of IEC 60350:1999, definition 3.17] Note 101: This does not include circulated functions that operate a grill element only. 3.108 microwave oven appliance using electromagnetic energy in the ISM frequency band of 2450 MHz for heating food and beverages in the cavity [IEC 60705:2010, definition 3.1] Note 101: The microwave oven may incorporate a browning element. Note 102: ISM frequency bands are the electromagnetic frequencies established by the ITU and reproduced in CISPR 11. 3.109 other heating function heating by energy other than microwave 3.110 cooling fan fan integrated in an appliance for the purpose of avoiding excessive temperatures 3.111 standard test load for functions using microwave energy, a cylindrical container of borosilicate glass with a maximum wall thickness of 3 mm, an outside diameter of approximately 190 mm and a height of approximately 90 mm, filled with 1000 g±50 g of water at 20 °C±5 °C Note 101: A glass rod or similar is placed in the glass container to prevent accidents due to the boiling delay factor. Note 102: To avoid noise from boiling water the load has to be changed before the measurements. Note 103: Other heating functions are operated and measured without load. 4 Measurement methods and acoustical environments This clause of GB/T 4214.1-2017 is applicable except as follows. 4.2 Direct method Addition: Note 101: If pure tone components are present in the noise emitted by the source, the estimated standard deviation of the measured sound pressure levels in the special reverberation room may increase. In such cases additional microphone positions or source positions may be necessary, as specified in GB/T 6881.3. 4.3 Comparison method Addition: Note 101: If pure tone components are present in the noise emitted by the source,the estimated standard deviation of the measured sound pressure levels in the hard-walled test room or in the special reverberation room may increase. In such cases additional microphone positions or source positions may be necessary as specified in GB/T 6881.2 and GB/T 6881.3. 5 Instrumentation This clause of GB/T 4214.1-2017 is applicable.

Contents of GB/T 4214.8-2021

Foreword I 1 Scope and object 2 Normative References 3 Terms and definitions 4 Measurement methods and acoustical environments 5 Instrumentation 6 Operation and location of appliances under test 7 Measurement of sound pressure levels 8 Calculation of sound pressure and sound power levels 9 Information to be recorded 10 Information to be reported Annexes Annex A (Normative) Standard test table Bibliography