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Praxis Mometrix Book
Terms in this set (6)
Audiometer equipment check
Put on the earphones and listen to the tones while switching across the frequencies. Listen closely while using the interrupter switch to start and stop each tone. If switching transients are audible, the patient may respond to these rather than to the pure tones, making the test invalid. Turn on the masking noise to make sure it works and that its output levels match the dB levels on the dial.
Allow the audiometer to warm up for 10 minutes. Set the frequency to 1000 Hz and the hearing level dial to 40 dB. Put on the earphones and listen (if you have normal hearing), switching the tone from one ear to the other. When the strength of the tone is equal on both sides, gradually lower the level toward 0 dB. You should be able to hear the tone at or near 0 dB with normal hearing if the machine and earphones are working properly and sound levels in the earphones are the same as or very close to the values indicated on the hearing level dial.
Masking level dial check
Use a sound level meter or vacuum tube volt meter. Take readings with the masking level dial set at regular intervals, working from the highest level to the lowest level.
Linearity of attenuation
the dial increases or decreases the noise output by the numerical increment shown on the dial.
Air conduction calibration
Test and determine hearing thresholds in both ears for 10 young adults who have normal hearing. Add up each ear results and divide by 10 to find the average. This should be the same as or very similar to the 0 dB setting on the audiometer.
Bone conduction calibration
Harder to check because any ambient or random noise coming into the ears via air conduction will mask bone conduction of sound at levels near threshold in subjects with normal hearing. Instead we can test people with
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