I have a very noisy air conditioner that have a 10kHz peak at 75 dB, the rest (fan/compressor/pump) are under the regulation limit.

I would like to understand what is the measurement spectrum. I think 10kHz is out of the measurement spectrum, but I am not sure.

What is the procedure to measure household appliances noise level?

  • $\begingroup$ What specifically are you having trouble understanding? Re: "what is the procedure...", have you read the standard? Section 4 "Measurement methods and acoustical environments" lists several methods. $\endgroup$ – Jonathan R Swift Jul 22 '19 at 13:35

What is the measurement Spectrum?

From BS EN 60704-1:2010+A11:2012 Page 10, Section 4.1 Paragraph 3

The preferred noise emission quantity is the A-weighted sound power level, LWA, in decibels

Acoustic Weighting Curves

It is not correct to assume that a peak at 10kHz is outside the measurement range - you can reduce your 75dB measurement by -2.5dB according to the curve shown above.

What is the procedure?

Page 11 Paragraph 1

According to this standard, two principal methods exist, the direct method and the comparison method, as described in 4.2 and 4.3 below. These two methods can be used alternatively.

And then subsequently in Page 11 Section 4.2

The direct method can be used only for measurements in qualified test environments according to ISO 3744 for free field conditions over reflecting plane(s), and according to ISO 3743-2 for special reverberation test rooms.

and Page 11 Section 4.3

The comparison method for measurement is explicitly described in ISO 3743-1 and in ISO 3743-2.


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