Test method for noise of household and similar electrical appliances - Particular requirements for electric thermal storage room heaters
1 Scope and object
This clause of GB/T 4214.1-2017 is applicable except as follows:
1.1 Scope
1.1.1 General
Replacement:
This document is applicable to the electric thermal storage room heaters having forced convection output, designed for placing on the floor, for wall-mounting or for building-in.
This document is not applicable to:
——controlled output thermal storage heaters with natural convection;
——free output thermal storage heaters;
——permanently installed central storage heating systems or their parts.
1.1.2 Types of noise
Replacement:
The methods listed in GB/T 6881.2, GB/T 6881.3, and GB/T 3767 may all be used for measuring noise emitted by electric thermal storage room heaters.
1.1.3 Size of the source
Replacement:
The method specified in GB/T 3767 is applicable to noise sources of any size (limited only by available test environment). 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 frequency range of interest, for sound power determination on electric thermal storage room heaters, includes at least the octave bands with center frequencies from 63 Hz to 8,000 Hz.
Note 101: In many cases, the 63 Hz octave band level does not participate significantly to the A-weighted level.
Note 102: When measuring this 63 Hz octave band, a special attention should be paid to the room effect.
Requirements for the declaration of noise emission values are not within the scope of this document.
Note 103: For determining and verifying noise emission values, declared in product specifications, see IEC 60704-3.
1.3 Measurement uncertainty
Replacement:
See Table 101 for the estimated values of standard deviations of sound power levels determined according to this document.
Table 101 Standard deviations of sound power levels
Standard deviation (dB)
σr (repeatability) σR (reproducibility)
0.4 1.0
Addition:
1.101 Standard deviation for declaration and verification
Values specified in Table 102 shall apply for the purpose of determining and verifying declared noise emission values according to IEC 60704-3.
Table 102 Standard deviation of declared and verified values
Standard deviation/dB
σP (production) σt (total) σM (reference)
0.7–1.1 1.2–1.5 2.0
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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.
3 Terms and definitions
This clause of GB/T 4214.1-2017 is applicable except as follows:
Addition:
3.101
storage heater
heater which stores heat obtained from electric energy by charging an accumulating core before a heat demand in a room occurs, the heat being discharged at any time
[Source: GB/T 31299-2014[1) GB/T 31299-2014 Household electric thermal storage room heaters - Methods for measuring performance (IEC 60531: 1999, IDT)]1), 3.1]
3.102
minimum discharge condition
condition under which the appliance is operated, the means for controlling the heat output, such as flaps and fans, being set at the lowest position
[Source: GB/T 31299-2014, 3.2]
3.103
maximum discharge condition
condition under which the appliance is operated, the means for controlling the heat output, such as flaps and fans, being set at the highest position, any boost position being ignored
Note: A boost position is a setting of a control for occasional use, which results in a higher temporary fan speed.
[Source: GB/T 31299-2014, 3.3]
4 Measurement methods and acoustic 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, proper precautions should be taken as specified in GB/T 6881.3.
4.3 Comparison method
Addition:
Note 101: If pure tone components are present in the noise emitted, proper precautions should be taken as specified in GB/T 6881.2 and GB/T 6881.3.
Foreword i
Introduction iii
1 Scope and object
2 Normative references
3 Terms and definitions
4 Measurement methods and acoustic environments
5 Instrumentation
6 Operation and location of appliances under test
7 Measurement of sound pressure level
8 Calculation of sound pressure and sound power levels
9 Record content
10 Report content
Annexes
