CAOHC Audiometric Booth and Equipment Calibration 2

Question 1

What is 'bioacoustic simulation' and how is it used in audiometric equipment quality control?

Accepted Answer

An electronic device that simulates human hearing responses to verify audiometric system accuracy

Answer

A bioacoustic simulator is an electronic device that receives acoustic signals and generates responses simulating a person with known hearing thresholds. It is used to verify the accuracy of the complete audiometric system including the audiometer, transducers, and booth.

Question 2

What maintenance should be performed on audiometric booth door seals?

Accepted Answer

Regular inspection for wear, compression set, or damage with replacement as needed to maintain acoustic integrity

Answer

Door seals are critical for maintaining the booth's sound isolation. They should be inspected regularly for signs of wear, permanent compression, cracking, or hardening. Degraded seals compromise noise reduction and must be replaced promptly.

Question 3

What is the significance of the '14-hour noise-free period' requirement before a baseline audiogram and how does it relate to booth considerations?

Accepted Answer

It allows temporary threshold shifts to recover; the booth ensures testing conditions are quiet enough for valid measurement

Answer

The 14-hour quiet period allows any temporary threshold shift from noise exposure to recover before baseline testing. The audiometric booth then provides the quiet environment needed to accurately measure the worker's recovered baseline hearing levels.

Question 4

How does the use of automatic audiometers affect calibration requirements?

Accepted Answer

Automatic audiometers require the same calibration standards as manual audiometers plus verification of the automated presentation algorithm

Answer

Automatic audiometers must meet all the same electroacoustic calibration requirements as manual instruments. Additionally, the automated tone presentation and threshold determination algorithms must be verified to ensure they produce accurate results.

Question 5

What is the consequence of using audiometric earphone cushions that have become hardened over time?

Accepted Answer

Hardened cushions do not conform properly to the ear, creating air leaks that affect low-frequency thresholds

Answer

Hardened earphone cushions lose their ability to conform to the contours of the ear, creating gaps that allow low-frequency sound to leak. This particularly affects low-frequency threshold measurements, where good acoustic sealing is critical.

CAOHC - Council for Accreditation in Occupational Hearing Conservation Practice Test

CAOHC - Council for Accreditation in Occupational Hearing Conservation Practice Test

CAOHC Audiometric Booth and Equipment Calibration 2