Acoustic Archive

Acoustic Files

File size: 1.93 MB Download

Acoustics: Determination in the field of structure-borne sound source strength of building service equipment (NT ACOU 117)

NT ACOU 117

  • This substitution method may be used as a survey method in the field to determine structure borne sound source strength of machines and building service equipment with light-framed structures or elastic supports on heavy-weight concrete floors.

File size: 1.95 MB Download

Road vehicles: Determination of noise emission (NT ACOU 116)

NT ACOU 116

  • This method specifies how to determine the noise emission characteristics of road vehicles to obtain input data to be used in prediction methods for road traffic noise.

File size: 166.17 KB Download

Measurement of occupational noise exposure of workers: Part ii: engineering method (NT ACOU 115)

NT ACOU 115

  • This Nordtest method specifies an engineering method for determination of occupational noise exposure at work places. The method contains different approaches for carrying out the measurements.

File size: 102.68 KB Download

Measurement of occupational noise eaxposure of workers: Part i: survey method (NT ACOU 114)

NT ACOU 114

  • This Nordtest Method specifies survey methods for determination of occupational noise exposure at work places.

File size: 210.44 KB Download

Acoustics: Prominence of impulsive sounds and for adjustment of Laeq (NT ACOU 112)

NT ACOU 112

  • Noise with prominent impulses is more annoying than continuous types of noise (without impulses or tones) with the same equivalent sound pressure level. Therefore an adjustment KI is added to the measured LAeq, if prominent impulses are present in the noise, to adjust for the extra annoyance due to the impulses.

File size: 138.62 KB Download

Acoustics: Human sound perception – Guidelines for listening tests (NT ACOU 111)

NT ACOU 111

  • It is the intention of these guidelines to provide a tool to increase the effectiveness and reliability of listening tests.

File size: 80.81 KB Download

Acoustics: Human sound perception – measurement positions for measurement of loudness (NT ACOU 110)

NT ACOU 110

  • The traditional physical descriptor, the A-weighted sound pressure level, LPA, is often not an adequate objective descriptor for perceived sound.

File size: 129.12 KB Download

Vehicles: Determination of immission relevant noise emission (NT ACOU 109)

NT ACOU 109

  • This NORDTEST method specifies determination of the noise emission of vehicles to obtain input data to be used in prediction methods for road traffic noise.

File size: 143.50 KB Download

Acoustics: In situ measurements of permanently installed public address systems (NT ACOU 108)

NT ACOU 108

  • This Nordtest method specifies a practical test method for in situ measurements of permanently installed public address systems.

File size: 84.96 KB Download

Acoustics: Framework for the verification of environmental noise calculation software (NT ACOU 107)

NT ACOU 107

  • This NORDTEST method gives the framework for the verification and subsequent type approval/certification and issuing a declaration that software intended for calculation of environmental noise levels yields results in conformity with a specific calculation method.

File size: 574.58 KB Download

Acoustics: Assessment of annoyance caused by vibrations in dwellings from road and rail traffic by means of socio-vibrational and social surveys (NT ACOU 106)

NT ACOU 106

  • This Nordtest Method is a guide to the content, conduct, text file output describing the survey, procedures, sites and objective measures, and the data file output of sociovibrational and social surveys measuring annoyance due to vibrations in dwellings from road and rail traffic.

File size: 264.85 KB Download

Air terminal devices: Acoustic transmission loss (NT ACOU 105)

NT ACOU 105

  • The method describes a test arrangement and procedure for measuring transmission loss without flow of duct-mounted air terminal devices. This is a laboratory substitution method, which is to be applied in a reverberation room.

File size: 240.88 KB Download

Ground surfaces: Determination of the acoustic impedance (NT ACOU 104)

NT ACOU 104

  • This NORDTEST method specifies a procedure for the determination of the normalised specific acoustic impedance of flat outdoor ground surfaces in situ.

File size: 138.80 KB Download

Machines - vibration: Mechanical mounting of accelerometers (NT ACOU 103)

NT ACOU 103

  • This Nordtest method specifies methods for accelerometer mounting to be used for measurement of vibration with limited peak amplitudes. It shall be used as a complement to IS0 5348:1998 in which basic information is given.

File size: 42.81 KB Download

Building elements - facade elements and facades: Field measurements of airborne sound insulation - Loudspeaker method using mls noise signals (NT ACOU 102)

NT ACOU 102

  • This NORDTEST method specifies a field method using a special kind of sound source signal, known as a “Maximum Length Sequence”.

File size: 121.90 KB Download

Radiator valves: Determination of the sound power level in the laboratory (NT ACOU 101)

NT ACOU 101

  • This Nordtest Method specifies a method of measuring in the laboratory, the noise emission (sound power level) from a radiator valve coupled to a specified reference radiator when a flow of water is forced through the valve at specified reference operating conditions.

File size: 93.13 KB Download

Machinery and equipment: Declared noise emission values based on the determination of the combined standard deviation (NT ACOU 100)

NT ACOU 100

  • This Nordtest method provides quidelines for determining the A-weighted declared single-number and dual-number noise emission values of machinery and equipment based on the determination of their spectrum or A- and C-weighted noise levels.

File size: 2.16 MB Download

Shooting ranges: Prediction of noise (NT ACOU 099)

NT ACOU 099

  • This Nordtest prediction method specifies calculation of noise in the vicinity of shooting ranges, etc. from single shots fired with small arms.

File size: 107.96 KB Download

Railway traffic: Noise (NT ACOU 098)

NT ACOU 098

  • This Nordtest method specifies a method for measurement of A-weighted sound pressure levels (noise immission) from railway traffic inside and outside buildings and in open terrain.

File size: 38.85 KB Download

Machines: Determination of emission sound pressure levels using sound intensity (NT ACOU 097)

NT ACOU 097

  • This NORDTEST method specifies how to determine theemission sound pressure level at the work station or at other specified positions of machines using sound intensity.

File size: 56.78 KB Download

Hearing aids: Electroacoustical properties using broad band input signals (NT ACOU 096)

NT ACOU 096

  • This NORDTEST method applies to hearing aids having automatic gain control (AGC) or similar adaptive circuitry. The method uses broad band noise to give reproducible characteristics of the electroacoustical properties of a hearing aid.

File size: 114.74 KB Download

Ducted silencers: Transmission loss, transfer function method in ducts (NT ACOU 095)

NT ACOU 095

  • This method specifies the characterisation of duct silencers. It sets out requirements for determining the transmission loss of silencers, in frequency bands and without air flow.

File size: 92.25 KB Download

Vibration measuring instrumentation: Verification procedure (NT ACOU 094)

NT ACOU 094

  • This document specifies a method for verification of instrumentation used for measurement of vibration.

File size: 271.16 KB Download

Building elements, small: Sound insulation, intensity scanning under laboratory conditions (NT ACOU 093)

NT ACOU 093

  • This Nordtest method specifies a laboratory sound intensity scanning method of measuring the airborne sound insulation of such small building elements as are defined below. This method also establishes directions about reporting and applying such test data.

File size: 56.71 KB Download

Luminaires with tubular fluorescent lamps: Sound power level (NT ACOU 092)

NT ACOU 092

  • This Nordtest method specifies procedures for laboratory measurements of airborne noise emitted by luminaires with tubular fluorescent lamps.

File size: 207.25 KB Download

Air terminal units, air terminal devices, dampers and valves: Sound power level by sound intensity (NT ACOU 091)

NT ACOU 091

  • This NORDTEST method specifies the way in which the sound power level of air terminal units, high/low velocity/pressure assemblies, dampers and valves used in air diffusion and air distribution is to be determined usin sound intensity.

File size: 149.72 KB Download

Building structures, junctions: Transmission of vibrations - field measurements (NT ACOU 090)

NT ACOU 090

  • This Nordtest method describes a field method for measuring the transmission of vibrations through junctions in buildings when a structure is excited mechanically into resonant, flexural vibrations.

File size: 177.36 KB Download

Wind turbines - noise: Performance (NT ACOU 089)

NT ACOU 089

  • This Nordtest method specifies the way in which sound pressure levels are to be measured under prescribed conditions and the way in which prescribed positions around a wind turbine and the way in which the source strength and other acoustical parameters are to be calculated from the measured sound pressure levels.

File size: 69.48 KB Download

Vibratory plate compactors: Noise test code (NT ACOU 087)

NT ACOU 087

  • This Nordtest method specifies operating conditions and methods to determine the sound power level and the emission sound pressure level at the work station of vibratory plate compactors. The results can be used to compare different vibratory plate compactors.

File size: 43.31 KB Download

Mobile walls: Rating of expected airborne sound insulation (NT ACOU 086)

NT ACOU 086

  • This Nordtest method specifies a method for mobile walls by which a relation is established between the airborne sound insulation measured in the laboratory and the airborne sound insulation to be expected in the field.

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