IEC 60704-2-13:2000 pdf download
IEC 60704-2-13:2000 pdf download.Household and similar electrical appliances – Test code for the determination of airborne acoustical noise – Part 2-13: Particular requirements for range hoods.
4 Measurement methods and acoustical environments This clause of part 1 as applicable except as tollows:
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 ace present in the noise emitted. prope precautions should be taken as specified
in ISO 3743-I and ISO 3743.2.
5 Instrumentation
This clause of part I is applicable except as follows:
5.1 InstrumentatIon for measuring acoustical data
Addition:
The use of a windscreen is recommended and, if necessary, 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-conditloning of appliances
6.1.1 Addition:
Recirculating-air range hoods should be fitted with a clean filter(s)
Air-extraction range hoods shall be fitted with the pipe coupling ring, if any, having the largest diameter among those provided by the manufacturer, If the range hood is designed to accommodate additional filters, those filters shall be clean and appropriately fitted,
6.1.3 Replacement:
Prior to noise measurements, the range hood shall have been in operation for running in for at least 4 h at the highest speed setting f or normal use (see notes in 1.2).
6.1.4 Replacement:
Immediately before each series of noise measurements, the range hood equipped for its intended use is operated for stabilizing at the highest speed setting for normal use (see notes in 1.2) for 30 mm.
6.2 Supply of electric energy and of water or gas
6.2.3 and 6.2.4 Not applicable.
6.4 Loading and operating of appliances during tests
6.4.2 Rep’acement:
The appliances shall be equipped according to 6.1.1.
The range hood shall be operated at the highest speed setting for normal use (see notes in 1.2).
Air•extractlon range hoods shall be loaded using a pipe connected to a muffler. The pipe shall be metallic with smooth inner walls and shall have the widest diameter among those specified by the manufacturer. It not stated, a standard pipe with the best fitting diameter shall be used. The muffler shall have an insertion loss as specified in the table of figure 101. It shall have a circular section with the same internal diameter as that of the pipe, a length as specified in figure 101 and shall not have parts protruding inside that may cause additional pressure drops. The pipe and the muffler shall also comply with all the specifications reported in figure 101 and care shall be taken that they do not radiate noise.
In particular. when connecting the pipe and muffler system to the range hood, care shall be taken that this connection does not transfer any additional structure borne noise. For this purpose, isolating connecting pieces can be used.
Static forces from the standard exhaust to the range hood shall also be avoided.
NOTE The tastenng ot the niuttler should not influence the acoustical held in the test room: to, example two wires could be hired around the muffler and on th. c.iiáng
Whenever it is possible to choose among two or more exit holes for the pipe connection, the one on the upper side of the range hood, if any, shall be used.
Range hoods designed for connection with more than one pipe at the same time shall be connected accordingly to the number of pipes required.
6.4.3 Not applicable.
6.5 Location and mounting of appliances
6.5.1 Replacement
Range hoods not intended to be placed against a wall shall be supported by resilient means (examples are given in figure 102). Care shall be taken in order to avoid any kind of interference between the supports and the air intake of the appliance under test
The lower edge of the appliance will be placed at a height of 0.6 m from the horizontal reflecting plane or from the floor of the test room.
For measurements in tree-field conditions over a reflecting plane, the microphone array and the measurement surface shall comply with 7.1.1.
For measurements in reverberant field, the minimum distance between any surface of the range hood and the nearest wall of the room shall be at least 1 m.
6.5.2 and 6.5.3 Not applicable.
