![]() ![]() ![]() If in doubt, use the noise meter to measure the background noise either before or after the Noise Quick Check. It is important that a noisy bac kground, eg due to road traffic or wind, is avoided. have a solid surface, such as concrete o r asphalt, that is free of any loose or sound-absorbing material. be free from large sound-r eflecting surfaces, including buildings, walls, bil lboards, vehicles, canopy / roof supports, trees or shrubs 4. be an open outdoor sit e (if this is not practicable, a canopied site may be used provided the cano py is at least 3 m above the microphone) 2. T o achieve this, the test site must, within at least a 3 m radius from the noise meter microphone: 1. The test environment must be such that exhaust noise readings can be achieved as acc urately as possible with as little interference from other noise sources as possible. ![]()
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