Refrigerator Model:HBC-70/200
（
India
）
５０
MAINTENANCE SERVICE AND TROUBLE SHOOTING
12.7.2 Noise test
At the geometrical center of measuring field, put the freezing refrigerator
onto an elastic base (5-6mm thick elastic rubber cushion). The refrigerator
should be empty. Turn the knob of temperature controller to middle or near
to strong position and close the door or cover. Make the measurement at
least 30 min. after refrigerator operation.
During test, if the refrigerator reaches the temperature the knob stipulated,
and
the refrigerator stops, the measurement must be interrupted and resume
3min.
after the refrigerator starts again.
The test environment is semi-sound-eliminating-room. Other test field must
comply with the stipulations in GB4214.
The test of noise is carried out as shown in figure 8. Put sound transfer
units to measurement point 1,2,3,4, measure the sound level by sound level
meter (A weighted). Take the greater readings and calculate the average
value. The arithmetic average value of these four points is taken as the
average sound pressure level noise.
According to the testing result, sound power level of the refrigerator being
measured can be calculated out.
L
W
=(L
PA
-2)+10LgS
Where: L
W
--A sound power level, dB (datum value is 1PW);
L
PA
--average sound pressure level of measuring surface,
dB(datum value is 20
μ
Pa);
S
—
measuring surface enveloped area, m
2
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