Lärmfibel

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	Preface
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	1.	Introduction
	2.	Planning foundations
	2.1	General legal foundations
	2.1.1	Pollution control rights
	2.1.2	Building law
	2.1.3	Civil Code, Criminal Code and Administrative Offences Act
	2.2	The physical terms "sound" and "noise"
	2.3	Noise, sound emission and sound immission
	2.4	Acoustic principles
	2.4.1	The sound scale
	2.4.2	Calculation rules
	2.4.3	Definitions of further terms
	2.4.4	Noise measurements
	2.4.4.1	The relevance of noise measurements
	2.4.4.2	The realization of measurements
	2.4.4.3	The measurement devices
	2.5	The effect of noise protection constructions
	2.6	Summary of noise assessment values based on immission values
	3.	Traffic noise
	4.	Industrial noise
	5.	Noise from sports and leisure facilities
	6.	Noise abatement plans / Noise action plans
	7.	Planning indications
	8.	Bibliography
	9.	Thematic Websites
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PLANNING FOUNDATIONS

2.4.4.3 The measurement devices

Sound level meters (fig. 2/13) record and process sound. The most common devices react to sound in a similar way as the human ear. The structure of all sound level meters is basically the same: Each system consists of a recording unit, an amplification unit and a calculation/output unit.

The basic structure of a sound level meter is illustrated in figure 2/14.

The current measurement result is displayed as a momentary level. The energetic average sound level, which is generally calculated for the evaluation of sound signals (see section 2.4.2), can also be displayed and recorded.

Devices for official measurements must comply with DIN EN 61672-1 and 61672-2 (grade of accuracy I) and be calibrated regularly.

Fig. 2/13: Modern sound level meter

Fig. 2/14: Block diagram of a sound level meter