Haier HBC-200 Service Manual page 47

MAINTENANCE SERVICE AND TROUBLE SHOOTING
(1) In semi-sound eliminating room or in sound eliminating room without
sound wave reflection.
(2) Put refrigerator onto 5-10mm elastic cushion.
(3) Refrigerator must be empty and running at least 30 minutes before
measuring. If normal stop happens, please make the measurement 3
minutes after refrigerator starting again.
(4) 4 measuring positions are required, they are 1m away from refrigerator
at front, back, front left, front right respectively. The height is 1/2 of
refrigerator; the instrument is accurate sound level meter (A weighted).
12.6.12 What's the different between national noise
standard 52dB(A) and ministry of light industry standard
42dB?
Answer: The noise of 52dB(A) in national standard is the sound power level.
Under the measuring conditions stipulated in national standard, measure
the refrigerator noise at four points, take the average of indicated reading at
greater noise situation, calculate the arithmetic average value of the four
points. This value is the average sound pressure level of noise, the
calculation formula is:
L =(L -2)+10LgS
w PA
where: L —sound power level, dB
W
L -average sound pressure level of measuring surface, dB
PA
S—the envelope area of measuring surface, m
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