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JJG 790-2005 English PDF

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JJG 790-2005: Verification regulation of laboratory standard microphones (coupler reciprocity method)
Status: Valid

JJG 790: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 790-2005	English	779	Add to Cart	5 days [Need to translate]	Verification regulation of laboratory standard microphones (coupler reciprocity method)	Valid	JJG 790-2005
JJG 790-1992	English	679	Add to Cart	5 days [Need to translate]	Verification Regulation of Standard Condenser Microphones	Obsolete	JJG 790-1992

PDF similar to JJG 790-2005

Standard similar to JJG 790-2005

GB/T 3222.2 GB/T 3222.1 JJG 188 JJG 921 JJG 778 JJG 798

Basic data

Standard ID	JJG 790-2005 (JJG790-2005)
Description (Translated English)	Verification regulation of laboratory standard microphones (coupler reciprocity method)
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A59
Word Count Estimation	30,317
Date of Issue	2005-10-09
Date of Implementation	2006-04-09
Older Standard (superseded by this standard)	JJG 790-1992
Quoted Standard	JJF 1001-1998; JJF 1059-1999; JJG 449-2001; JJG 176-2005; JJG 175-1998; GB/T 3102.7-1993; GB/T 3947-1996; IEC 61094-1-2000; IEC 61094-2 -1992
Summary	This standard applies to laboratory standard microphones initial verification, testing and use of follow-up inspection.

JJG 790-2005: Verification regulation of laboratory standard microphones (coupler reciprocity method)

---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.
Verification regulation of laboratory standard microphones (couple reciprocity method) People's Republic of China National Metrological Verification Procedures Laboratory standard microphone (Coupling cavity reciprocity method) 2005-10-09 released 2006-04-09 implementation General Administration of Quality Supervision, Inspection and Quarantine released Laboratory standard microphone (Coupling Chamber Reciprocal Law) verification procedures Replacing JJG 790-1992 This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on October 09,.2005, and since April 09,.2006 shall come into force. Administrative Organization. National Acoustic Measurement Technical Committee Drafting Organization. China Institute of Metrology The procedures entrust the National Acoustic Measurement Technical Committee responsible for the interpretation Drafters of this Code. Mei-e Zhang (China Institute of Metrology) Chen Jianlin (China Institute of Metrology) Shen Yang (China Institute of Metrology) Shuai Zhengping (China Institute of Metrology) Bai Ying (China Institute of Metrology) Zheng Xiaoyuan (China Institute of Metrology)

1 Scope (1) 2 References (1) 3 Terms and measurement units (1) 3.1 Laboratory standard microphone (1) 3.2 open circuit voltage (1) 3.3 microphone sound pressure sensitivity (1) 3.4 microphone sound pressure sensitivity level (2) 3.5 Electro Transfer Impedance (2) 3.6 acoustic transfer impedance (2) 4 Overview (2) 5 measurement performance requirements (2) 5.1 Sound pressure sensitivity level (2) 5.2 Sound pressure sensitivity level of the frequency response (2) 5.3 Stability (2) 6 General technical requirements (3) 6.1 Materials and structures (3) 6.2 signs and factory calibration data (3) 7 measuring instruments control (3) 7.1 test conditions (3) 7.2 test items (4) 7.3 test method (4) 7.4 test results of the treatment (8) 7.5 test cycle (8) Appendix A Acoustic pressure sensitivity level calculation of the correction (9) Appendix B test certificate and test results within the notice page format (16) Appendix C Measurement Uncertainty Evaluation Example (18) Laboratory standard microphone (Coupling Chamber Reciprocal Law) verification procedures This procedure is based on the International Electrotechnical Commission standard IEC 61094-1..2000 "Measuring Microphone Part 1. Real Laboratory Standard Microphone Specifications "and IEC 61094-2..1992" Measurement Microphone Part 2. Reciprocal Technology Primary Method for Lab Standard Microphone Sound Pressure Calibration "JJG 790-1992" Standard Capacitor Microphone (Coupling Cavity reciprocity law) "be amended.

1 Scope

This procedure applies to the laboratory for the first test of standard microphones, follow-up test and the use of the test.

2 References

This regulation cites the following documents. JJG 175-1998 "test condenser microphone" JJG 176-2005 "sound calibrator" JJG 449-2001 "Octave and 1/3 octave filters" JJF1001-1998 "Common measurement terms and definitions" JJF1059-1999 "Measurement Uncertainty Evaluation and Expression" GB/T 3102.7-1993 "Acoustic Quantity and Unit" GB/T 3947-1996 "Acoustics terminology" IEC 61094-1..2000 Measurement Microphones Part 1. Specifications for chamber standardmicrophones IEC 61094-2..1992 Measurement Microphones Part 2. Primary method for pressure calibrationoflaboratorystandardmicrophonesbythereciprocitytechnique When using this code, care should be taken to use the currently valid version of the above cited references.

3 Terms and measurement units

This code uses the amount and unit of GB/T 3102.7 specified in acoustics, as well as the provisions of GB/T 3947 phase Terms and definitions. Refer to IEC 61094-1..2000 and IEC 61094-2..1992 as required by this code The following terms and definitions. 3.1 Laboratory standard microphone (laboratorystandardmicrophone) The ability to calibrate to very high levels of accuracy with primary-level calibration methods such as Hermetic Coupling Reciprocity Electroacoustic performance (especially due to time stability and environmental conditions) There are stringent requirements condenser microphone. 3.2 open circuit voltage (open-circuitvoltage) When the microphone and the provisions of the ground shield structure connected but no other load, with the insertion voltage technology in the microphone AC voltage measured at the output. The unit is volts (V). 3.3 microphone sound pressure sensitivity (pressuresensitivityofamicrophone)

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