Test Pipes Decibel Level.

JLarson

Also, do you know at what distance the dB level is being measured? That has a big impact.

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Visser51

Hi JLarson

Good point.

I have directly copied and pasted what the requirements of our noise test requirements are below for you.

Test site requirements


2.2(1) A test site used in the application of this standard must be an open outdoor site that:


(a) is predominantly flat, particularly within the immediate test area; and


(b) incorporates within a radius of not less than 3 metres (10 feet) from the

sound level meter microphone:


(i) a space free from large sound-reflecting surfaces including

buildings, walls, billboards, vehicles, trees, or shrubs; and


(ii) a solid surface such as concrete or asphalt, free of any loose or

sound-absorbing material.


2.2(2) Exhaust noise emission testing on a low volume vehicle may be carried out under

a canopy, provided that no part of the canopy, including its supports, are within 3 metres (10 feet) of the sound level meter microphone.


NOTE: Accurate and repeatable exhaust noise emission test results can only be obtained by using a location

with a solid ground surface and no major sound reflecting surfaces, such as a large car park.

Regards,

Visser51

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