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Standard Insuued on: 1987-02

GB 7342-1987    IEC provisional reference coupler for the calibration of earphones used in audiometry
测听耳机校准用IEC临时参考耦合腔
Category No.:GB Valid Status:abolished
Issued Organization:SAC Issued Date:1987-02-28
Implemented Date:1987-11-1 Abolished Date:2011-05-01
Superseded Standard.:GB/T 25498.3-2010 Electroacoustics - Simulators of human head and ear - Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
Superseded Date:2011-5-1
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GB 7301-1987   CB* 3061-1987   GB/T 7253-1987   GB/T 7352-1987   GB/T 7230-2008   GB/T 7249-2008   GB/T 7252-2001   GB/T 7321-1987   GB 7631.1-1987   GB/T 7320-1987   GB/T 7326-1987   GB 7325-1987   GB 7326-1987   GB 491-1987   YS/T 300-1994   GB/T 7246-1987   GB 859-1987   GB/T 94.3-1987   GB/T 861.2-1987   GB/T 94.1-1987  

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