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JJF 1202-2008 English PDF

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JJF 1202-2008: Calibration specification for electret microphones
Status: Valid

JJF 1202: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJF 1202-2008	English	459	Add to Cart	4 days [Need to translate]	Calibration specification for electret microphones	Valid	JJF 1202-2008
JJF 1202-1990	English	239	Add to Cart	2 days [Need to translate]	Operating technical norm of 0. 633μm wavelength primary standard	Obsolete	JJF 1202-1990

PDF similar to JJF 1202-2008

Standard similar to JJF 1202-2008

GB/T 3222.2 GB/T 3222.1 JJG 188 JJF 1201 JJF 1203 JJF 1200

Basic data

Standard ID	JJF 1202-2008 (JJF1202-2008)
Description (Translated English)	Calibration specification for electret microphones
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A59
Classification of International Standard	17.140
Word Count Estimation	20,252
Date of Issue	2008-04-16
Date of Implementation	2008-07-16
Quoted Standard	JJF 1034-2005; JJF 1059-1999; JJG 176-2005; GB 3102.7-1993; GB 3240-1982; GB/T 14198-1993; SJ/T 9564-1995; IEC 60268-4-2004
Regulation (derived from)	?AQSIQ Announcement 2008 No.45
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine
Summary	This standard applies to the electret microphone calibration.

JJF 1202-2008: Calibration specification for electret microphones

---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 electret microphones People's Republic of China National Metrology Technical Specifications Electret microphone calibration specifications Posted 2008-04-16 2008-07-16 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Electret microphone calibration specifications ElectretMicrop hones 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 Drafting. Shenzhen Academy of Metrology and Quality Inspection China Testing Technology Research Institute This specification metering commissioned National Technical Committee is responsible for interpreting acoustics Drafters of this specification. HONGKONG whole (Shenzhen Academy of Metrology and Quality Inspection) Zhang Guoqing (Shenzhen Academy of Metrology and Quality Inspection) Jiao Jian (Shenzhen Academy of Metrology and Quality Inspection) Hao Yu-chuan (China Testing Technology Research Institute) Dai Bin (Spectris China Ltd.) Luo Yuan (Shenzhen Academy of Metrology and Quality Inspection) Duan Xu (Shenzhen Academy of Metrology and Quality Inspection) Li dry (Shenzhen Academy of Metrology and Quality Inspection)

1 Scope (1) 2. Referenced Documents (1) 3 terminology and units of measurement (1) 3.1 Sound pressure sensitivity (sound pressure response) (1) 3.2 sound pressure sensitivity level (Lm) (1) 4 Overview (1) 5 Metrological characteristics (2) 5.1 sound pressure sensitivity level (2) 5.2 Frequency Response (2) Calibration Condition 6 (2) 6.1 environmental conditions (2) 6.2 standards and other measuring equipment (2) 7 calibration items and calibration methods (2) 7.1 calibration items (2) 7.2 Calibration method (3) 8 calibration results expression (5) 8.1 Calibration Data Processing (5) 8.2 calibration certificate (5) 8.3 calibration measurement uncertainty (5) 9 Recalibration interval (5) Appendix A calibration certificate (6) Evaluation Examples Appendix B electret microphone calibration Uncertainty (9) Electret microphone calibration specifications

1 Scope

This instruction applies to calibration electret microphone calibration.

2 Citations

This specification references the following documents. JJF 1034-2005 "Acoustic measurement terminology and definitions" JJF 1059-1999 "Evaluation and Expression of Uncertainty in Measurement" JJG176-2005 "sound calibrators" GB 3102.7-1993 "Quantities and units of acoustics" GB 3240-1982 "acoustic measurement commonly used frequency" GB/T 14198-1993 "microphones general technical conditions" SJ/T 9564-1995 "electret microphone quality grading standards" IEC 60268-4.2004Soundsystemequipment-Part 4. Microphones (sound system equipment - Four parts. a microphone) 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 the following terminology and definitions and the related JJF 1034-2005. This specification uses Quantities and units specified in GB 3102.7-1993. According to the specification required, the following terminology. 3.1 Sound pressure sensitivity (sound pressure response) (Mp) pressuresensitivity (pressureresponse) Receiving transducer output of the open-circuit voltage and the ratio of the receiving transducer on the surface of some solid sound pressure. In volts per Pa, V/Pa. 3.2 sound pressure sensitivity level (Lm) pressuresensitivityleve1 Sound pressure sensitivity level Lm is the sound pressure sensitivity and Mp reference sound pressure sensitivity of Mr expressed in decibels. Lm = 20lg (Mp/Mr) Where. Mr = 1V/Pa, the reference sound pressure sensitivity.

4 Overview

Electret microphone is a prevalent electro-acoustic transducer, namely polarization plate electret material after charge In the long-term dielectric surface capacitive microphone. Electret microphone calibration is screened, the sound pressure Ling Sensitivity and frequency response characteristics of the menstrual cycle calibration, as a standard to determine the other electret microphone frequency response and sound pressure sensitivity Characteristics of electret microphone.

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