JJF 1201-2008

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JJF 1201-2008	English	649	Add to Cart	5 days	Calibration specification for hearing aids measurement instrument	JJF 1201-2008	Valid	JJF 1201-2008

JJF 1201-2008
Calibration specification for hearing aids measurement instrument
People's Republic of China National Metrology Technical Specifications
Hearing aid tester calibration specification
Posted 2008-04-16
2008-07-16 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
Hearing aid tester calibration specification
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 unit. Hubei Provincial Institute of Measurement and Testing
This specification by the responsible National Technical Committee acoustic measurement interpretation
Drafters of this specification.
Yao Qiuping (Hubei Institute of Measurement and Testing)
When the root of fire (Hubei Institute of Measurement and Testing)
Xu Ying (Hubei Institute of Measurement and Testing)
Dan Shuguang (Hubei Institute of Measurement and Testing)
Song Yifeng (Hubei Institute of Measurement and Testing)
table of Contents
1 Scope (1)
2. Referenced Documents (1)
3 terminology and units of measurement (1)
4 Overview (1)
5 Metrological characteristics (1)
The noise floor of the test chamber in 5.1 (1)
5.2 sound source characteristics (1)
5.3 Sound pressure level measurement accuracy (2)
5.4 Test microphone frequency response (2)
Total harmonic distortion 5.5 sound pressure level measurement system (2)
5.6 Linear (2)
5.7 RMS Characteristics (2)
5.8 Rise/Recovery Time (2)
Calibration Condition 6 (2)
6.1 environmental conditions (2)
6.2 Standard device and other equipment (2)
7 calibration items and calibration methods (3)
7.1 calibration items (3)
7.2 Calibration method (3)
8 calibration results expression (7)
8.1 Calibration Data Processing (7)
8.2 calibration certificate (7)
8.3 calibration measurement uncertainty (7)
9 Recalibration interval (8)
Appendix A calibration certificate (9)
Examples Appendix B Evaluation of Measurement Uncertainty (12)
Hearing aid tester calibration specification
1 Scope
This instruction applies to a hearing aid tester calibration.
2 Citations
This specification references the following documents
GB/T 3102.5-1993 "electricity and magnetism Quantities and units"
GB/T 3102.7-1993 "acoustic volume and unit"
GB/T 6657-1986 "Measurement of electroacoustical characteristics of hearing aids."
GB/T 6659-1986 "with a measurement method of electro-acoustic characteristics of hearing aids AGC circuit"
JJG176-2005 "sound calibrators test procedures"
JJG449-2001 "octave and 1/3 octave filter test procedures"
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"
IEC 60118-7.2005 "electroacoustic aids - Part 7. When the hearing aid product delivery quality inspection
Performance measurement "(Electroacoustics-Hearingaids-Part 7. Measurementoftheperformancecharac-
teristicsofhearingaidsforproduction, supplyanddeliveryqualityassurancepurposes)
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 GB/T 3102.5-1993 Quantities and units and GB/T 3102.7-1993 prescribed.
4 Overview
Hearing aid tester is a device for measuring the electro-acoustic characteristics of hearing aids, which mainly consists of test cases, the sound source, control is transferred
Composition microphone, ear simulator, sound pressure measurement systems, attenuator, distortion measurement systems and power supply and other parts.
5 Metrological characteristics ①
5.1 The noise floor of the test chamber
The noise floor of the test chamber should be low enough in the frequency range of 200Hz ~ 8kHz-third octa