GB/T 33856-2017Methods of measurement for main characteristics of equipments of sound systems for emergency purposes (English PDF)
应急声系统设备主要性能测试方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 31, 2017
Implementation date
December 1, 2017
Scope
GB/T 33856-2017 is the English-translated version of 应急声系统设备主要性能测试方法.
GB/T 33856-2017 gives the methods for measuring the main characteristics of the equipment making up a sound system for emergency purposes, a system able to broadcast into a protected area when an emergency occurs.
It covers the tests on emergency loudspeakers and on control and indicating equipment. It applies to general sound reinforcement and distribution systems, and to similar control and indicating devices in broadcast systems whose warning signal carries no speech; it does not apply to systems with only a sounder or an electric bell.
Annexes B and C are normative: loudspeaker acoustic performance and rated noise power endurance. It cites GB/T 2421.1-2008, GB/T 3241-2010, GB/T 3785.1-2010, GB/T 6278-2012, GB/T 12060.4-2012, ISO 7240-4:2003 and IEC 60268-1:1985.
It replaces GB/T 16851-1997, was issued on 31 May 2017 and has applied since 1 December 2017.
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Document preview — GB/T 33856-2017
National Standard of the People's Republic of China
- ICS
- 33.160.01
- Classification
- M 70
- Replacing
- GB/T 16851-1997
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 normative reference document
- 3 terms, definitions and abbreviations
- 4 emergency speaker test
- 5 Test of the control and pointing device (cie)
- Appendix A (informative) Speaker Physical Reference
- Appendix B (normative appendix) Speaker Acoustic performance measurement
- Appendix C (Normative Appendix) Speaker Rated Noise Power Measurement (Durable)
- Reference
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This part of the standard instead of GB/T 16851-1997 "emergency sound system", compared with GB/T 16851-1997 main technical changes as follows.
--- adjust the scope of application;
--- modified terms and definitions;
--- Added test methods for emergency loudspeakers (see Chapter 4);
- Added control of the control and pointing device (cie) (see Chapter 5).
1 Scope
This standard specifies the test method for the main performance of the emergency sound system equipment which can be broadcast in the protected area in an emergency situation, Including testing of emergency loudspeakers, testing of control and indicating equipment.
This standard applies to general sound reinforcement and distribution systems.
This standard also applies to similar control and indicating devices used in broadcast systems where the warning signal does not include voice information.
This standard does not apply to systems with only a sounder or an electric bell.
2 Normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including all modifications) applies to this document.
GB/T 2421.1-2008 Environmental and environmental testing of electrical and electronic products - Overview and guidance
GB/T 3241-2010 Electro - acoustic octave and fractional octave - frequency filters
GB/T 3785.1-2010 Electromagnetic sound level gauges - Part 1: Specifications
GB/T 6278-2012 Sound System Equipment Overview Analog program signals
GB/T 12060.4-2012 audio system equipment - Part 4: Methods of measurement of microphones
ISO 7240-4:2003 Fire detection and alarm systems - Part 4: Power supply equipment (Fire detection and alarm systems - Part 4: Power supply equipment)
IEC 60268-1:1985 Sound System Equipment Part 1: General (Sound system equipment - Part 1: General)
3 Terms, definitions and abbreviations
3.1 Terms and definitions
The following terms and definitions apply to this document.
3.1.1 Emergency sound system
In case of emergency, in order to protect life, broadcast information is provided in one or more indoor or outdoor areas for rapid and orderly evacuation of hazardous areas Within the staff of the emergency system. Including the use of loudspeakers to broadcast emergency voice, alarm signals and so on. In non-emergency situations, the system can be used as a system General broadcast system.
3.1.2 Emergency Speaker Zone
An area consisting of one or more acoustic partitions. In an emergency situation, it can be defined independently to distinguish it from other areas and can Exclusive broadcast information for that area.
Note: When used as a non-emergency use, the speaker area division can be different from the area of the emergency.
3.1.3 Emergency loudspeaker
When an emergency occurs, the emergency sound system is used to broadcast loudspeakers for emergency voice and alarm signals.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 3241-2010Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications
- GB/T 3785.1-2010Electroacoustics - Sound level meters - Part 1: Specifications
- GB/T 6278-2012Simulated programme signal
- GB/T 12060.4-2012Sound system equipment -- Part 4: Methods of measurement for microphones
GB/T 2421.1-2008 · ISO 7240-4:2003 · IEC 60268-1:1985
Similar standards
Editions of GB/T 33856
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 33856-2017 | Methods of measurement for main characteristics of equipments of sound systems for emergency purposes | current edition | Current |
| GB/T 16851-1997 | Methods of measurement for main characteristics of equipments of sound systems for emergency purposes | previous edition | Superseded |
This page sells the current edition, GB/T 33856-2017. Earlier editions are listed for reference only.
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Related Standards
GB/T 12060.4-2012 — Sound system equipment -- Part 4: Methods of measurement for microphones
GB/T 3241-2010 — Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications
GB/T 6278-2012 — Simulated programme signal
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