FANUC A06B-6077-H106 Matrix switch card

FANUC A06B-6077-H106 Matrix switch card

Before starting the transformer sound level measurement the background noise level is measured. If the difference between background noise level and the noise level of the transformer is more than 8 dB (A), no correction at the noise level of the transformer is needed. If the difference is between 3 dB (A) and 8 dB (A), a correction is needed acc. to the standards. No measurement shall be made, if the difference between background noise level and the transformer noise level is less than 3 dB. The correction factor for the effect of background noise level to the transformer noise level is the in the below table as per IEC 60076 - 10;

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The characteristics of the measuring equipment 

are described at the international standards. The noise level of the transformer is measured acc. to IEC 60076 - 10, NEMA standards using the evaluation of the weighting curve A. The principle of parameters influencing noise are either internal ( frequency, flux, mass, quality of magnetic material and operation ) or external ( distance ) . According to the laws of acoustics, the volume of sound decreases with the square of the distance “ d “ from the assumed point source, ie the centre of the equivalent hemispher ;

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