GB/T 4854.3-2022Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators (English PDF)

1 Scope

The following contents specified in this document are applicable to the calibration of bone vibrators for pure tone bone conduction audiometry.

a) The reference equivalent threshold vibration force level, which corresponds to the hearing threshold of the bone conduction audiometry of the young normal ear;

b) The basic characteristics of the bone vibrator and its coupling method with the subject and with the force coupler;

c) Basic characteristics and reference levels of masked noise applied to non-test ears.

Guidelines for practical use of this document in calibrating audiometers are given in Appendix B.

The reference equivalent threshold vibration force level refers to the vibration force level transmitted through the vibrator to the force coupler with specific characteristics, and the value is equal to the specified vibration force level.

Test conditions and vibration force levels evoked to induce normal hearing thresholds on the mastoid when the voltage is switched on.

Note 1.Refer to Appendix C for the tentative difference between the reference equivalent threshold vibration force levels between the forehead and the mastoid.

NOTE 2 Standard methods for conducting bone conduction audiometry have been specified in ISO 8253-1.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

ISO 389-1 Benchmark zero level for acoustic calibration of audiometric devices - Part 1.In-ear headphone pure-tone reference equivalent threshold sound pressure level (Acoustics-Referencezero for the calibration of audiometric equipment-Part 1.Reference

Note. GB/T 4854.1-2004 Benchmark Zero Level of Acoustic Calibration Audiometry Equipment Part 1.In-ear Headphone Pure Tone Benchmark Equivalent Threshold Sound Pressure Level (ISO 389-1.1998, IDT)

ISO 389-2 Acoustically calibrated audiometric equipment, benchmark zero level - Part 2.Insertion-headphone pure-tone benchmark equivalent threshold sound pressure level (Acoustics-Referencezero for the calibration of audiometric equipment-Part 2.Reference

Note. GB/T 16402-1996 Acoustic Insertion Headphone Pure Tone Benchmark Equivalent Threshold Sound Pressure Level (eqvISO 389-2.1994)

ISO 389-4 Zero reference level for acoustic calibration of audiometric devices - Part 4.Reference level for narrowband masking noise (Acoustics- masking noise)

Note. GB/T 4854.4-1999 Reference zero level for acoustic calibration audiometric equipment Part 4.Reference level for narrowband masking noise (eqvISO 389-4.

1994)

IEC 60318-6 Electroacoustic head and ear simulators - Part 6.Mechanical couplers for bone vibrator measurements (Electro- bonevibrators)

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