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Related Experiment Videos

Audiometer calibration: interpreting and applying the standards.

G R Lightfoot1

  • 1Department of Clinical Engineering, Royal Liverpool University Hospital, UK. g.lightfoot@liverpool.ac.uk

British Journal of Audiology
|November 18, 2000
PubMed
Summary
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Calibration of audiometers requires judgment, potentially leading to practice variations. This guidance clarifies measurements for distortion, crosstalk, and linearity, ensuring accurate audiological assessments and preventing harm from excessive distortion.

Area of Science:

  • Audiology
  • Metrology
  • Medical Device Calibration

Background:

  • The application of British Standard BS EN 60645-1 (IEC 645-1) for audiometer calibration involves subjective judgment.
  • This subjectivity can lead to inconsistencies in calibration practices among different agencies.

Purpose of the Study:

  • To address practical issues in applying BS EN 60645-1 for audiometer calibration.
  • To provide suggestions for consistent and precise measurements of key audiometer performance parameters.
  • To highlight the audiological risks associated with excessive distortion in audiometers.

Main Methods:

  • Discussion of measurement techniques for distortion, on-off effect, crosstalk, linearity, and rise/fall time.
  • Recommendations for the precise positioning of earphones on an artificial ear.

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  • Suggestions for appropriate levels of precision for each measurement.

    • Main Results:

    • Identified areas where judgment influences calibration outcomes.
    • Proposed standardized approaches for critical performance measurements.
    • Emphasized the importance of minimizing distortion for patient safety.

    Conclusions:

    • Standardized application of BS EN 60645-1 is crucial for reliable audiometer calibration.
    • Consistent measurement practices reduce variability and improve the accuracy of hearing assessments.
    • Attention to distortion levels is vital to prevent adverse audiological consequences.