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JJF 1203-2008 English PDF

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JJF 1203-2008: Calibration specification for electro-acoustic products(loudspeakers) power life-span measurement equipments
Status: Valid
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JJF 1203-2008English649 Add to Cart 5 days [Need to translate] Calibration specification for electro-acoustic products(loudspeakers) power life-span measurement equipments Valid JJF 1203-2008

PDF similar to JJF 1203-2008


Standard similar to JJF 1203-2008

GB/T 3222.2   GB/T 3222.1   JJG 188   JJF 1201   JJF 1202   JJF 1200   

Basic data

Standard ID JJF 1203-2008 (JJF1203-2008)
Description (Translated English) Calibration specification for electro-acoustic products(loudspeakers) power life-span measurement equipments
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A59
Word Count Estimation 28,273
Date of Issue 2008-04-16
Date of Implementation 2008-07-16
Quoted Standard GB/T 3102.7-1993; GB/T 3241-1998; JJF 1001-1998; JJF 1034-2005; JJF 1059-1999
Regulation (derived from) AQSIQ Announcement No. 45 of 2008
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine
Summary This standard applies to electro-acoustic products (speakers and systems) power life tester (hereinafter referred to as tester) calibration.

JJF 1203-2008: Calibration specification for electro-acoustic products(loudspeakers) power life-span measurement equipments


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calibration specification for electro-acoustic products (loudspeakers) power life-span measurement equipments People's Republic of China National Metrology Technical Specifications Audio products (speakers category) Power life test instrument calibration specification Products (Loudspeakers) PowerLife-spanMeasurementEquipments Posted 2008-04-16 2008-07-16 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Audio products (speakers category) Power life test instrument calibration specification Electro-acousticProducts (Loudspeakers) ments This specification by the State Administration of Quality Supervision, Inspection and Quarantine approved on April 16, 2008, and from From July 16, 2008 into effect. Focal point. the National Committee of the acoustic measurement technology The main drafting units. China Electronics Technology Group Corporation Institute Institute of Acoustics People's Liberation Army medical research Acoustics Metrology Station Participated in the drafting unit. Beijing Innovation Foundation Science and Technology Development Co., Ltd. China Shipbuilding Industry Corporation seventh ○ a This specification by the responsible National Technical Committee acoustic measurement interpretation The main drafters of this specification. Li Huan (Third Research Institute of China Electronics Technology Group Corporation) Liu (Institute of Acoustics) Panyue Wu (Third Research Institute of China Electronics Technology Group Corporation) Diao Yin (Institute of Acoustics) At Dawn (People's Liberation Army medical research Acoustics Metrology Station) Drafters participate. Liu Fangxiong (China Shipbuilding Industry Corporation seventh ○ a) Mumin (Beijing Innovation Foundation Science and Technology Development Co., Ltd.) Zhao Xianming (Beijing Innovation Foundation Science and Technology Development Co., Ltd.)

table of Contents

1 Scope (1) 2. Referenced Documents (1) 3 terminology and units of measurement (1) 4 Overview (1) 5 Metrological characteristics (1) 5.1 white noise signal spectral characteristics (1) 5.2 pink noise signal spectral characteristics (1) Weighted power spectral characteristics of the analog program signals 5.3 (1) 5.4 filter characteristic (2) 5.5 control circuit characteristics (3) 5.6 and audio amplifiers characteristics (3) 5.7 rms voltmeter Features (3) 5.8 crest factor characteristic (3) 6 calibration conditions (3) Environmental conditions 6.1 (3) 6.2 Standard device and other equipment (3) 7 calibration items and calibration methods (4) 7.1 calibration items (4) 7.2 Calibration method (4) 8 calibration results expression (7) 8.1 calibration certificate (7) Measurement Uncertainty Evaluation 8.2 Calibration Results (7) 9 Recalibration interval (7) Appendix A calibration certificate (8) Appendix B Measurement Uncertainty Evaluation Examples (12) Audio products (speakers class) power life test instrument calibration specification

1 Scope

This instruction applies to audio products (speakers and systems) power-durability tester (hereinafter referred to as the tester) school quasi.

2 Citations

This specification references the following documents GB/T 3102.7-1993 "acoustic volume and unit" GB/T 3241-1998 "octave and fractional octave filters" JJF 1001-1998 "common measurement terms and definitions" JJF 1034-2005 "Acoustic measurement terminology and definitions" JJF 1059-1999 "Evaluation and Expression of Uncertainty in Measurement" When using this specification it should be noted that using the currently valid version of the documents cited.

3 terminology and units of measurement

This specification uses terminology and definitions relating to the JJF 1001-1998 and JJF 1034-2005. This specification uses quantities and units GB/T 3102.7-1993 prescribed. According to the specification required, gives the following terms and definitions. 3.1 audio products electro-acousticproducts Can be achieved between electricity and sound energy conversion products. 3.2 Power Life powerlife-span At rated power, electro-acoustic products that work normal hours.

4 Overview

Tester Life Test for power and speaker system, mainly controlled by the noise source, filter, electric door The composition of the road, audio amplifiers, and other components rms voltmeter.

5 Metrological characteristics

5.1 white noise signal spectral characteristics Unevenness of white noise signal spectrum. within 20Hz ~ 20kHz frequency range of not more than 2.0dB. 5.2 pink noise signal spectral characteristics Pink noise signal spectrum unevenness. in the 20Hz ~ 20kHz frequency range of not more than 3.0dB. Weighted power spectral characteristics of the analog program signals 5.3 1/3 octave band weighting the power spectrum of the analog program signal should meet the requirements in Table 1. Reference calculate weighted frequency power spectrum Rate given by the manufacturer. If the manufacturer is not given, the frequency corresponding to 0dB selected in Table 1, the relative power level is.

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