At this moment there are more and more unmanned automatic working noise monitor installations. They automatically select undesirable noises and produces useful parameters. The most used application is measuring aircraft noise and industrial noise. But also other activities are monitored like pop concerts, motorcycle circuits, motor ways and railway yards. The main advantage of such an installation is saving costs and manpower and larger sampling of continuous noise. Also noise incidents can better be detected. An important aspect of this kind of measuring is the measurement uncertainty caused by errors in the noise selection process and the equivalency to a manned measurements. At present there is no national or international acknowledged validation method. I this article two different methods are described.
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