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Audiometer calibration: two neglected areas

P A Smith1, J R Foster

  • 1MRC Institute of Hearing Research, Nottingham.

British Journal of Audiology
|November 28, 1997
PubMed
Summary
This summary is machine-generated.

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Audiometer calibration for headband force and output linearity is often neglected. New, simple methods ensure accurate measurements, with many tested audiometers failing headband force standards but passing linearity tests.

Area of Science:

  • Audiology
  • Medical Device Calibration
  • Hearing Science

Background:

  • International standards mandate specific static force limits for audiometer earphones/bone vibrators.
  • Current audiometer calibration standards lack detailed procedures for measuring headband force and low-level output linearity.
  • A survey indicated these calibration aspects are frequently overlooked by service organizations.

Purpose of the Study:

  • To develop and describe equipment and protocols for measuring audiometer headband static force and output linearity.
  • To assess compliance with existing standards for these parameters in a sample of audiometers.

Main Methods:

  • Development of specialized equipment and standardized protocols at the MRC Institute of Hearing Research.
  • Calibration of a convenience sample of audiometers using the developed methods.

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Main Results:

  • A wide variation in headband forces was observed, with many audiometers not meeting the required standard.
  • All measured audiometers demonstrated compliance with the standard for linearity of output at low intensity levels.

Conclusions:

  • Simple, inexpensive, and reliable devices and protocols for routine audiometer calibration are now available.
  • Routine measurement of headband force and output linearity is recommended to ensure compliance with standards.