NT Methods Archive

Here you can find and download all published NT Methods.

NT Methods Files

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.

File size: 90.31 KB Download

Acoustical screens: Rating and classification (NT ACOU 085)

NT ACOU 085

  • This Nordtest method gives methods for rating and classifying the sound attenuation and the sound absorption of screens intended for use in large rooms without partitions in order to increase speech privacy or noise insulation between working positions.

File size: 104.34 KB Download

Building elements: Sound insulation, intensity scanning under laboratory conditions (NT ACOU 084)

NT ACOU 084

  • This Nordtest method specifies a sound intensity scanning method to determine the sound reduction index, as defined by IS0 140/3, of a building element.

File size: 95.84 KB Download

Buildings: Vibration and shock, evaluation of annoyance (NT ACOU 082)

NT ACOU 082

  • This document specifies a method to measure the weighted acceleration level of vibration and shock in buildings for an evaluation of human annoyance from whole-body vibration.

File size: 52.35 KB Download

Ound signalling devices: Acoustic emission (NT ACOU 081)

NT ACOU 081

  • This NORDTEST method primarily specifies the way in which the acoustic properties of sound signalling devices are to be tested.

File size: 720.78 KB Download

Industrial plants: Noise emission (NT ACOU 080)

NT ACOU 080

  • This Nordtest engineering method specifies a method for measuring sound pressure levels at prescribed positions surrounding stationary noise sources at industrial plants and calculating the source strength based on the measured sound pressure levels.

File size: 65.90 KB Download

Air traffic: Noise immission, residental areas (NT ACOU 075)

NT ACOU 075

  • This document specifies a NORDTEST Method for measurements of outdoor air traffic noise immission in residential areas.

File size: 101.66 KB Download

Air traffic: Noise reductions of dwellings (NT ACOU 074)

NT ACOU 074

  • This document specifies a NORDTEST method for simple measurements of air traffic noise reduction of dwellings.

File size: 236.24 KB Download

Tapping machines - impact sound insulation: Verification procedure (NT ACOU 071)

NT ACOU 071

  • This verification procedure specifies tests to verify compliance with the characteristics specified in Appendix 1. 

File size: 61.18 KB Download

Noise sources - sound power level: Engineering method - reference sound source, in situ (NT ACOU 070)

NT ACOU 070

  • This NORDTEST engineering method specifies how to measure sound pressure levels produced at prescribed measurement points in the far or near field by the noise source under test and by a reference sound source.

File size: 172.33 KB Download

Doors in buildings: Airborne sound insulation (NT ACOU 069)

NT ACOU 069

  • This NORDTEST method describes how to determine the sound reduction index of doors in buildings, i.e., in the presence of surrounding party walls whose contribution to the sound transmission may be significant.

File size: 176.43 KB Download

Sound level meters: Verification procedure (NT ACOU 068)

NT ACOU 068

  • This document specifies test methods for control measurements on sound calibrators and on sound level meters for measuring timeweighted (S, F and I) and time-averaged (LACK and LEA) sound pressure levels.

File size: 363.38 KB Download

Windows: Traffic noise reduction indices (NT ACOU 061)

NT ACOU 061

  • The purpose of this NORDTEST merhod is to specify traffic noise reduction indices of windows and to give guidelines on how to use these indices.

File size: 70.42 KB Download

Rooms: Reverberation time – Interrupted noise precision method (NT ACOU 059)

NT ACOU 059

  • This document specifies a precision laboratory NORDTEST method of measuring reverberation times according to the interrupted noise method.

File size: 145.11 KB Download

Road traffic: Measurement of noise immission – survey method (NT ACOU 056)

NT ACOU 056

  • This Nordtest method states procedures for measuring road traffic noise inside and outside buildings and in open terrain, under specified traffic and environmental conditions, at distances up to 100 m from the road.

File size: 44.18 KB Download

Garden vehicles: Operator’s noise (NT ACOU 054)

NT ACOU 054

  • This document specifies a method for the measurement of driver's exposure to noise from machine powered garden vehicles.

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