What type of sound level meter must be used for area noise level surveys?

For area noise level surveys, a Type 2 sound level meter is the correct choice. This type of meter is designed for general measurement of environmental noise, which includes area noise surveys that assess the sound levels in various environments such as streets, parks, or residential areas.

Type 2 meters have a sufficient frequency response and dynamic range for measuring outdoor noise in less controlled environments, which is essential for obtaining accurate readings during surveys. They provide a good compromise between precision and ease of use, making them suitable for field measurements where high precision is not as critical compared to laboratory settings.

In contrast, Type 1 meters are designed for more precise measurements in controlled conditions, such as laboratory testing, while Type 3 meters are intended for basic noise assessments and may not meet the requirements for comprehensive surveys. Type 4 meters are often used for specific applications like industrial noise measurements but may not be suitable for general environmental noise surveys. This distinction highlights the specific capabilities and appropriate use cases for different types of sound level meters, ensuring that Type 2 is the optimal choice for area noise level assessments.