Emission measurement
Directly at the source: the sound power level of a machine or installation, the quantity on which every forecast is based.
Standard-compliant sound level measurements according to TA Lärm and DIN requirements with calibrated Class 1 instrumentation, as a reliable data basis for the assessment.
AI-generated
Measurements form the data basis of every acoustic assessment. They are prompted by complaints, requirements from authorities, evidence in permit procedures and the verification of measures taken. Depending on the question, data is recorded at the source, at the relevant receiver location or as a continuous measurement over several days.
We measure with calibrated Class 1 instrumentation to IEC 61672. Which regulations govern the assessment depends on the situation: TA Lärm, the administrative regulation under the Federal Immission Control Act (BImSchG), for installations and commercial operations, DIN 4109 for sound insulation in buildings, and DIN 45680 for low-frequency noise, which is assessed band by band in one-third octaves rather than by an overall value.
You receive a measurement report with measurement setup, boundary conditions, results and assessment, traceable from the raw file to the final figure. We carry out measurement, analysis and assessment ourselves; at no point is information adopted unchecked.
Directly at the source: the sound power level of a machine or installation, the quantity on which every forecast is based.
Where people live: what actually arrives outside and indoors, assessed against the immission guideline values of TA Lärm.
Hums from heat pumps, combined heat and power units or ventilation systems, assessed in one-third octaves according to DIN 45680 instead of by an overall value.
Over days and weeks with a ready-to-ship loan device, read out via remote access, for noises that only occur intermittently.
Almost every airborne sound measurement ends in an A-weighted level, written dB(A); TA Lärm also assesses on this basis. Behind it is a filter that makes the instrument roughly as insensitive as the human ear, because we do not hear equally well at all frequencies.
At 3 kHz, a tiny sound pressure is enough. At 40 Hz, it takes ten thousand times as much before anything is perceived at all. This very curve is the template.
The A-curve is the mirrored hearing threshold: it attenuates low-frequency components and leaves the range around 1 to 5 kHz almost unchanged. At 40 Hz, it reduces the level by around 35 decibels.
With low-frequency noise, this is misleading. A one-third-octave band can lie well above the hearing threshold while the A-weighted level remains unremarkable. That is why DIN 45680 exists.
Responsible for processing and analysing measurement data, from the recording to the figures in the report.