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CAOHC Audiometric Booth and Equipment Calibration Flashcards

6 cards from real CAOHC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 CAOHC Audiometric Booth and Equipment Calibration flashcards as text

  1. What is the maximum permissible ambient noise level for the 500 Hz octave band in an audiometric test room according to ANSI S3.1?

    Answer: 40 dB SPL

    ANSI S3.1 specifies maximum permissible ambient noise levels (MPANLs) for audiometric testing rooms. For the 500 Hz octave band, the MPANL is 40 dB SPL when testing to 0 dB HL using supra-aural earphones.

  2. How often must audiometers used in occupational hearing conservation programs receive exhaustive calibration?

    Answer: At least annually

    OSHA requires exhaustive (electroacoustic) calibration of audiometers at least annually. This comprehensive calibration verifies that the audiometer's output meets ANSI specifications across all frequencies and intensity levels.

  3. What is the purpose of the daily biological calibration check of an audiometer?

    Answer: To verify the audiometer is functioning within acceptable limits by testing a person with known, stable hearing

    Daily biological calibration involves testing a person with known, stable hearing thresholds. If results deviate by more than 10 dB from established levels at any frequency, the audiometer requires service before being used for testing.

  4. What is the maximum allowable deviation from reference values during a daily functional check of an audiometer?

    Answer: Plus or minus 10 dB at any test frequency

    During a daily functional (biological) check, audiometer output should not deviate by more than plus or minus 10 dB from established reference values at any test frequency. Deviations beyond this indicate the need for recalibration or service.

  5. Which ANSI standard governs the specifications for audiometers used in hearing conservation programs?

    Answer: ANSI S3.6

    ANSI S3.6 specifies the requirements for audiometric equipment, including output levels, frequency accuracy, and harmonic distortion limits. Audiometers used in occupational programs must meet this standard.

  6. What is the primary purpose of an audiometric test booth?

    Answer: To reduce ambient noise to levels that allow valid hearing threshold measurements

    The audiometric booth provides a controlled acoustic environment with reduced ambient noise. Without adequate noise reduction, background noise can mask test signals and result in falsely elevated hearing thresholds.