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intro to Aud. Ch 4

Audiometers

QuestionAnswerxtra info
portable audiometer used for screening-not diagnosis
clinical audiometer not portable-set up in sound rooms
attenuator dial (intensity) makes sound softer in dBHL it's like the volume dial
switch allows you to present the tone
output selection directs the tone to either earphone-red=right, blue=left you can only test one ear at a time.
types of output 1.headphones (for air-conduction testing), 2.loud speaker (sound-field testing), 3.bone conduction vibrator (bone-conduction testing)
speech audiometer input select, amplifier, Vu-meter, attenuator, output selection
input select (on a speech audiometer) us a microphone to talk, cd player or tape player
amplifier internal part that makes sound as loud as it can be
Vu-meter displays a signal level in Volume Units
Daily listening check (biological check) a test of the equipment to make sure it's working check list: intensity, frequency, cords, switch, both headphones, bone vibrator
ANSI American National Standards Institute sets the standards for audiometer manufacturers
testable frequencies for portables 125, 250, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000 and 8000Hz
Oscillator (frequency) produces tones of discreet frequencies at octave intervals
range of intensities for portable -10dB HL to 110 dB HL in steps of 5db HL
bone conduction testing range 250 - 4000 Hz
dB HL hearing level
HTL hearing threshold level
ear sensitivity level 1K - 3K Hz
Golden Ears people who can hear .0002 dynes/cm2 there are very few people who have this hearing
RETSPL reference equivalent threshold sound pressure
reference for db HL the softest sound for average normal hearing (not the golden ears) it varies by frequency
if attenuator is set at 0dB HL and oscillator is set at 125Hz, the output is? 45 dB SPL
if attenuator is set at 0dB HL and oscillator is set at 250Hz, the output is? 25.5 dB SPL
if attenuator is set at 0dB HL and oscillator is set at 500Hz, the output is? 11.5 dB SPL
if attenuator is set at 0dB HL and oscillator is set at 1KHz, the output is? 7 dB SPL
if attenuator is set at 0dB HL and oscillator is set at 2KHz, the output is? 9 dB SPL
if attenuator is set at 0dB HL and oscillator is set at 4KHz, the output is? 9.5 dB SPL
if attenuator is set at 0dB HL and oscillator is set at 8KHz, the output is? 13.0 dB SPL
Audiometer (pure tone) a device used to determine the threshold of hearing contains an oscillator dial, amplifier, attenuator dial, switch, and output selection
Created by: schaunag
 

 



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