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
Why is it important to verify that the audiometer's tone presentation indicator light is not visible to the person being tested?
Answer: Seeing the indicator light could cause the person to respond based on visual cues rather than hearing the tone
If the person being tested can see the tone presentation indicator light, they may respond when they see the light flash rather than when they hear the tone. This produces falsely good threshold results that do not reflect actual hearing ability.
How should an OHC handle a situation where the audiometric booth meets ANSI standards for supra-aural earphones but not for insert earphones?
Answer: Use supra-aural earphones with the higher ANSI noise limits, or reduce ambient noise to meet the stricter insert earphone requirements
Insert earphones have different (generally more lenient) ambient noise requirements because they provide more attenuation. However, if the question states the booth does not meet insert earphone standards, the OHC should use supra-aural earphones (which have higher allowable noise limits) or reduce booth noise.
What is the recommended warm-up time for an audiometer before beginning daily testing?
Answer: Follow the manufacturer's specifications, typically 5-15 minutes
Most audiometer manufacturers recommend a warm-up period of 5-15 minutes before testing. This allows electronic components to stabilize and ensures the output levels are accurate and consistent throughout the testing session.
Which calibration check specifically verifies that the audiometer's output increases by the correct amount with each step of the dial?
Answer: Attenuator linearity check
The attenuator linearity check verifies that each step of the intensity control produces the correct change in output. Each 5 dB step on the attenuator must produce exactly 5 dB of change in the acoustic output across the entire intensity range.
What is the purpose of tone rise and fall time specifications in audiometer calibration?
Answer: To prevent audible clicks or transient sounds that could cue the listener when tones start and stop
Tone rise and fall times specify how quickly the test tone ramps up and down when presented and terminated. Times that are too short produce audible clicks, while times that are too long make it difficult for the listener to detect tone onset.
An audiometric testing program uses three different audiometers. What calibration practice ensures data consistency across all three instruments?
Answer: All three audiometers must be calibrated to the same ANSI reference standards using traceable calibration equipment
All audiometers must be calibrated to the same ANSI S3.6 reference standards using equipment with traceable calibration to the National Institute of Standards and Technology. This ensures that a threshold measured on one instrument matches the result on any other.