DIN 45680

Low-Frequency Noise Measurement and Assessment

DIN 45680 specifies procedures for measuring and evaluating low-frequency noise (typically 8 Hz to 160 Hz) immissions in buildings and indoor environments. Low-frequency noise from sources such as wind turbines, industrial equipment, traffic, and HVAC systems can cause annoyance and health effects even at sound pressure levels below conventional noise limits. The standard defines frequency-weighted assessment methods, measurement locations, and evaluation criteria specific to low-frequency phenomena. Accreditation for this test method enables laboratories to conduct specialized assessments required for wind energy projects, industrial operations, and building acoustics investigations in sensitive environments.

What it measures

Sound pressure levels in the low-frequency range (8–160 Hz)
Low-frequency weighted acceleration and vibration metrics
Frequency content and tonal characteristics of low-frequency sources
Indoor sound field distribution and room resonance effects
Infrasound component presence and magnitude

🇩🇪 DIN EN ISO 389-7 🇬🇧 BS EN ISO 389-7 🇫🇷 NF EN ISO 389-7 🇮🇹 UNI EN ISO 389-7 🇪🇸 UNE EN ISO 389-7 🇳🇱 NEN EN ISO 389-7 🇩🇪 DIN EN ISO 226 🇬🇧 BS EN ISO 226 🇫🇷 NF EN ISO 226 🇮🇹 UNI EN ISO 226 🇪🇸 UNE EN ISO 226 🇳🇱 NEN EN ISO 226

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LHBE (Laboratoire d'hygiène, biosécurité et environnement)

COFRAC 1-1610 Papeete (Tahiti), PF

NF T 90-412 DIN EN ISO 21528-2 DIN EN ISO 7899-1 DIN EN ISO 10304-1 DIN ISO 16649-2 + 3 more

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DIN 45681 Acoustics — Tonality assessment
ISO 389-7 Acoustics — Reference zero for the calibration of audiometric equipment — Part 7: Reference threshold of hearing under free and diffuse sound field conditions
ISO 226 Acoustics — Normal equal-loudness-level contours