Assessing And Controlling Industrial Noise BS4142

Question 1

What is the LAeq,Tr?

Answer 1

Th specific sound level

The sound level from a specific sound source at the assessment position + time reference interval

Question 2

What is Tr?

Answer 2

The time reference interval

Question 3

What is LAr,Tr?

Answer 3

The rating level

The specific sound level plus any character adjustments

Question 4

What is LAr,Tr?

Answer 4

The rating level

The specific sound level plus any character adjustments

Question 5

What is ambient sound?

Answer 5

Totally encompassing sound in given situation

Question 6

What is the residual sound?

Answer 6

Ambient sound in absence of specific sound source (LAeq,T)

Question 7

What is LA90,T?

Answer 7

The background sound level it is for 90% of the time

Question 8

What is the method for rating industrial noise?

Answer 8

1. With specific sound source measure ambient sound level
2. Without specific sound source measure the residual sound level and background sound level
3. Subtract residual noise level from ambient noise level to get the specific noise level

Apply a correction based on annoying characteristics to get the rating level

Consider the difference between the rating level and the background level