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Norm
ÖNORM EN ISO 7235
Issue date: 2003 12 01
Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal units - Insertion loss, flow noise and total pressure loss (ISO 7235:2003)
This International Standard specifies methods for determining
the insertion loss, in frequency bands, of ducted silencers with and without airflow,
the sound power le...
Withdrawn: 2010 01 01
§ Legal References
Publisher:
Austrian Standards International
Format:
Digital | 58 Pages
Language:
German
| English
Currently valid:
Optionally co-design standards:
ICS
This International Standard specifies methods for determining
the insertion loss, in frequency bands, of ducted silencers with and without airflow,
the sound power level, in frequency bands, of the flow noise (or regenerated sound) generated by ducted
silencers,
the total pressure loss of silencers with airflow, and
the transmission loss, in frequency bands, of air-terminal units.
The measurement procedures are intended for laboratory measurements at ambient temperature.
Measurements on silencers in situ are specified in ISO 11820.
It is to be noted that the results determined in a laboratory according to this International Standard will not
necessarily be the same as those obtained in situ (installation), as different sound and flow fields will yield
different results. For example, the pressure loss will be lower under laboratory conditions than in situ, but will
be comparable between different laboratories.
This International Standard is applicable to all types of silencer including silencers for ventilating and airconditioning
systems, air intake and exhaust of flue gases, and similar applications. Other passive air-handling
devices, such as bends, air-terminal units or T-connectors, can also be tested using this International
Standard.
This International Standard is not applicable to reactive silencers used for motor vehicles.
NOTE 1 Annex A specifies the sound field excitation equipment. Annex B gives requirements for the transition element.
Annex C gives details of duct walls and limiting insertion loss. Annex D specifies how to convert one-third-octave band
attentuation values to octave band values. Annex E gives requirements for measurements on large parallel-baffle
silencers. Annex F specifies a test of longitudinal attenuation. Annex G gives guidelines on anechoic terminations and
Annex H shows examples of measurement arrangements.
NOTE 2 Acoustic testing of air-terminal devices an (...abbreviated)
ÖNORM EN ISO 7235
2010 01 01
Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal units - Insertio...
Norm
ÖNORM EN ISO 7235
2003 12 01
Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal units - Insertio...
Norm
↖
ÖNORM EN ISO 7235
1995 10 01
Acoustics - Measurement procedures for ducted silencers - Insertion loss, flow noise and total press...
Norm
Norm
Issue date :
2002 10 22
Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 3: Precision method for measurement by scanning
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Issue date :
2009 12 01
Acoustics - Determination of sound power levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995, including Cor 1:1995)
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Issue date :
2003 12 01
Measurement of fluid flow by means of pressure differential devices inserted in ciruclar cross-section conduits running full - Part 4: Venturi tubes (ISO 5167-4:2003)
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Issue date :
2003 12 01
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 3: Nozzles and Venturi nozzles (ISO 5167-3:2003)
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Issue date :
2003 12 01
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 2: Orifice plates (ISO 5167-2:2003)
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Issue date :
2003 12 01
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 1: General principles and requirements (ISO 5167-1:2003)
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Issue date :
1997 07 01
Acoustics - Measurements on silencers in situ (ISO 11820:1996)
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Issue date :
1999 05 01
Acoustics - Determination of sound power levels of noise from air-terminal devices, air-terminal units, dampers and valves by measurement in a reverberation room (ISO 5135:1997)
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Issue date :
2009 12 01
Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for reverberation rooms (ISO 3741:1999, including Cor 1:2001)
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Issue date :
1999 07 29
Acoustics — Determination of sound power levels of noise sources using sound pressure — Precision methods for reverberation rooms
Norm
Issue date :
1995 08 10
Acoustics — Determination of sound power levels of noise sources using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane
Norm
Issue date :
1991 12 12
Measurement of fluid flow by means of pressure differential devices — Part 1: Orifice plates, nozzles and Venturi tubes inserted in circular cross-section conduits running full
Norm
Issue date :
1984 01 01
Air distribution and air diffusion — Rules to methods of measuring air flow rate in an air handling duct
Norm
Issue date :
2002 10 22
Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 3: Precision method for measurement by scanning
Norm
Issue date :
1997 12 18
Acoustics — Determination of sound power levels of noise from air-terminal devices, air-terminal units, dampers and valves by measurement in a reverberation room
Norm
Issue date :
1990 12 06
Acoustics — Determination of sound power radiated into a duct by fans — In-duct method
Norm
Issue date :
2010 01 01
Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal units - Insertion loss, flow noise and total pressure loss (ISO 7235:2003)
Norm
Issue date :
2003 08 28
Acoustics — Laboratory measurement procedures for ducted silencers and air-terminal units — Insertion loss, flow noise and total pressure loss