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<br />Measurement Procedures <br /> <br />When noise measurements are performed, an important part of site selection is the consideration <br />of errors caused by reflecting objects. Figure 4.1 shows the effect on noise measurements of a <br />reflective object such as a wall. <br /> <br />Errors Caused by Reflecting Objects <br /> <br />Reflective Surface <br /> <br />Approximately 3 dBA Error <br /> <br />Sound Source <br /> <br />... <br />... <br /> <br />2d <br /> <br />. <br /> <br />~ <br /> <br />Sound Level Meter <br /> <br />Reflective Surface <br /> <br />... <br /> <br />d <br /> <br />.... <br /> <br />~ <br /> <br />d <br /> <br />. <br /> <br /> <br />Approximately 1/ 2 dBA Error <br /> <br />Sound Source <br /> <br />... <br /> <br />Sound Level Meter <br /> <br />Figure 4.1 <br /> <br />11 <br />