IEC 60704-2-2:2009 pdf free download

IEC 60704-2-2:2009 pdf free download Household and similar electrical appliances – Test code for the determination of airborne acoustical noise – Part 2-2: Particular requirements for fan heaters
1 Scope and object
This clause of part 1 is applicable except as follows:
1.1 Scope
1.1.1 General
Replacement:
This standard applies to electric fan heaters, designed for placing on the floor, table or counter, etc., or for wall-mounting.
This standard does not apply to
– electric storage room heaters;
– room humidifiers;
– room dehumidifiers;
– air cleaners;
– heaters designed exclusively for industrial purposes.
1.1.2 Types of noise
Replacement:
ISO 3743-1 , ISO 3743-2 and ISO 3744 can be used for measuring noise emitted by fan heaters.
1.1.3 Size of the source
Replacement:
The method specified in ISO 3744 is applicable to noise sources of any size. When applying ISO 3743-1 and ISO 3743-2, care should be taken that the maximum size of the appliance under test fulfils the requirements specified in Subclause 1 .3 of ISO 3743-1 and ISO 3743-2.
1.2 Object
Addition:
The frequency range of interest for sound power determination on fan heaters includes at least the octave bands with centre frequencies from 63 Hz to 8000 Hz.
NOTE 1 In many cases, the 63 Hz octave band level does not participate significantly to the A-weighted level.
NOTE 2 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
standard.
NOTE 3 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, are as follows:
2 Normative references
This clause of part 1 is applicable.
3 Terms and definitions
This clause of part 1 is applicable.
4 Measurement methods and acoustical environments
This clause of part 1 is applicable except as follows:
4.2 Direct method
Addition:
NOTE If pure tone components are present in the noise emitted, proper precautions should be taken as specified in ISO 3743-2.
4.3 Comparison method
Addition:
NOTE If pure tone components are present in the noise emitted, proper precautions should be taken as specified in ISO 3743-1 and 3743-2.
5 Instrumentation
This clause of part 1 is applicable except as follows:
5.1 Addition:
Windscreens should be used and the relevant corrections for changes in the microphone sensitivity shall be added to the observed sound pressure levels.
6 Operation and location of appliances under test
This clause of part 1 is applicable except as follows:
6.1 Equipping and pre-conditioning of appliances
6.1.1 Addition:
Air filters, if any, shall be clean.
6.1.3 Replacement:
Prior to noise measurements, the appliance equipped in accordance with Subclause 6.1 .1 ,shall have been in operation for a total period of at least 2 h for running-in at the highest speed setting with the maximum heating switched on for normal permanent use.
Oscillating function if available shall be switched on.