LG RD-JT30 Service Manual page 84

Appendix C Noise Testing Standard
(1) Desk high is 75 cm
(2) Projector have to closed to the edge of desk
(3) Noise meter high is 150 cm & title 30 degree
(4) The distance between noise meter and projector is 100 cm
(5) Measured four surfaces and calculated the noise value by log average.
(6) We have designed excel files to calculate this value. (Avg_Noise.xls)
We will define the typical value and maximum value for each face in the feature.
Step I: Please Input Measured Noise Value (dB)
Step II: (A~D / 10)
Step III: Power(10,(A~D/10))
Step IV: Sum(Power(10,(ValueA~D/10))/4
Step V: Log10 (StepIV) *10
(Input) front rear
(Data) A B
(Process)
(Process)
(Process)
(Result)
Left Right
C D
10