JJG 2038-2004 English PDF

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JJG 2038-2004: Verification Scheme of Measuring Instruments for Audiometry
Status: Valid

JJG 2038: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 2038-2004	229	Add to Cart	3 days	Verification Scheme of Measuring Instruments for Audiometry	Valid
JJG 2038-1989	199	Add to Cart	2 days	Verification Scheme of Measuring Instruments for Audiometry	Obsolete

Similar standards

GB/T 3222.2   GB/T 3222.1   JJG 188   JJF 2038   JJF 2012   JJG 2037   

Basic data

Standard ID: JJG 2038-2004 (JJG2038-2004)
Description (Translated English): Verification Scheme of Measuring Instruments for Audiometry
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Classification of International Standard: 17.140
Word Count Estimation: 8,830
Date of Issue: 2004-09-21
Date of Implementation: 2005-03-21
Older Standard (superseded by this standard): JJG 2038-1989
Regulation (derived from): 2004 technical regulations issued by national metrology (industrial measurement 2005 Volume 15, Issue 1)
Summary: This standard applies to money transfer hearing measurement equipment, which includes air conduction hearing devices and zero baseline level of zero-level baseline bone conduction hearing devices by listening standards of measurement to measurement value transfer procedure between the hearing apparatus work, money transfer best measurement capability and value transfer method when. In conducting the hearing projects calibration can also be used as a basis for traceability.

JJG 2038-2004: Verification Scheme of Measuring Instruments for Audiometry

---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 Scheme of Measuring Instruments for Audiometry People's Republic of China National Metrology Verification System Table Hearing instruments 2004-09-21 released 2005-03-21 implementation General Administration of Quality Supervision, Inspection and Quarantine released Hearing instruments measuring system table Instruments for Audiometry Replacing JJG 2038-1989 The verification system table by the State General Administration of Quality Supervision, Inspection and Quarantine September 21,.2004 approval, And since March 21,.2005 shall come into force. Administrative Organization. National Acoustic Measurement Technical Committee Main drafting units. China Institute of Metrology The verification system table by the National Acoustic Measurement Technical Committee responsible for the interpretation The main drafters of this system table. Chen Jianlin (China Institute of Metrology) Qiu Jianhua (China Institute of Metrology) Participate drafters. Mei-e Zhang (China Institute of Metrology) Shuai Zhengping (China Institute of Metrology) Bai Ying (China Institute of Metrology) Zheng Xiaoyuan (China Institute of Metrology)

table of Contents

1 Scope (1) 2 hearing instruments benchmarking (1) 2.1 hearing measurement standards of the composition of appliances (1) 2.2 air guide hearing zero level reference device (1) 2.3 bone conduction hearing level zero reference device (1) 3 Hearing instruments (2) 3.1 Listening Meters (2) 3.2 hearing measurement standard value of the device delivery (2) 4 Hearing work measuring instruments (2) 5 hearing instrument measuring system block diagram (2) Hearing Instruments Test System *

1 Scope

This verification system table is suitable for the measurement of hearing instruments delivery, which includes the air guide hearing level zero reference device and bone Leading Hearing Zero-level reference device by the standard measurement of hearing instruments to the work of measuring the amount of hearing transfer procedures, the amount of The value of the delivery method and the value of the best measurement of delivery. In hearing project calibration, but also as a traceability The basis.

2 audiometric instruments

2.1 hearing measurement standards of the composition of the appliance Audiometric instruments include the GJJ (sound) 0401 "air guide hearing zero level reference device" and GJJ (sound) 0402 "Bone conduction hearing zero level reference device." 2.2 air guide hearing level zero reference device 2.2.1 GJJ (sound) 0401 "air conduction hearing zero level reference device" by the reference standard benchmark simulation ear and measuring the release Amplifier, sinusoidal signal generator, band-pass filter and high impedance headphones and other major supporting equipment. Benchmarking the ear Audible frequency range 50Hz ~ 10kHz, measurement uncertainty 0.3dB (k = 3). Air conduction hearing level zero reference device Of the recurrence value of the audible frequency range of the sound pressure sensitivity (V/Pa), and calculate the benchmark simulation ear frequency Should, its audible frequency range 50Hz ~ 10kHz, measurement uncertainty 1.0dB (k = 3). 2.2.2 The transmission of sound pressure sensitivity measurement using the comparative measurement method, the standard standard measuring instrument ear simulation with The standard simulation ear is compared to obtain the standard simulation of the ear frequency response, the comparison method includes the standard simulation ear acoustic coupling Chamber and working standard microphone two parts. The value of the audible frequency range of 50Hz ~ 10kHz, the most value transfer Good measurement capability of 1.0dB (k = 2). 2.2.3 air guide hearing zero level sound pressure level reference device traceable to the GJJ (sound) 0101 "coupling cavity reciprocal method sound pressure Reference device ", using the reciprocal reciprocal coupling cavity method to benchmark the standard laboratory microphone in the ear for mutual calibration, obtained Laboratory standard microphone open sound pressure sensitivity, in the 50Hz ~ 10kHz frequency range, the measurement uncertainty 0.08dB (k = 2). From the basic unit from the value of the main way to pass. current → GJJ (electricity) 0701 "AC Voltage Reference Below 1MHz" → GJJ (Acoustic) 0101 "Coupling Chamber Reciprocal Method Sound Pressure Reference Unit" → GJJ (sound) 0401 "air conduction hearing level zero reference device." Note. Since.2003, the original "Metrology Verification System" collectively referred to as the "Metrology Verification System Table." 2.3 bone conduction hearing level zero reference device 2.3.1 GJJ (sound) 0402 "bone conduction hearing zero reference device" by the reference standard reference impedance head and the basic imitation True mastoid, measurement amplifier, sine signal generator and band-pass filter and other major supporting equipment. Reference impedance head The audible frequency range of 250Hz ~ 8kHz, measurement uncertainty of 0.6dB (k = 3). Bone conduction hearing zero-based reference equipment Reproduce the value for the value of the audible frequency range of the value of the voltage sensitivity (V/N), the audible frequency range 250Hz ~ 8kHz, measurement uncertainty of 1.5dB (k = 3). ......

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