Audiometer

u can read in this PPT about Audiometer , types of audiometer and parts of audiometer.
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1. AUDIOMETER BY - Anant Arun Student of B.ASLP From SAIMS Date – 10/04/2018

2. INDEX Audiometer Types of Audiometer Diagnostic or clinical Audiometer Screening Audiometer Computer based Audiometer Automatic Audiometer Parts of Audiometer Oscillator Attenuator Interrupter switch Frequency dial Stimulus or Tone switch Output selector Input selector Talk back

3. AUDIOMETER An audiometer is an electronic instrument used by an audiologist to quantify hearing . An audiometer produces pure tone of various frequencies , atlemuates them to various intensity levels and delivers them to transducers. An audiometer is for the measurement of hearing activities and specifically to measure the hearing threshold.

4. TYPES OF AUDIOMETER Diagnostic or clinical Audiometer Screening Audiometer Computer based Audiometer Automatic Audiometer

5. Diagnostic Or Clinical Audiometer A diagnostic audiometer is an instrument capable of performing a variety of hearing tests , including pure tone audiometry and must conform to certain standard of operations , as specified bt ANSI for diagnostic audiometers. Available from a variety of manufactures Come in a variety of shape and size Some are designed for limited space or for portability.

6. Screening Audiometer A Screening Audiometer is typically used for doing hearing screening in the field or in other situations in which a patient cannot be tested in the clinics Smaller in size , portable and only uses pure tone to assess hearing The ranges of frequencies and intenities are more limited with a screening audiometer than a diagnostic audiometer.

7. Computer based Audiometer With computer based audiometry there is the capability of having the computer generate and control the sounds , as well as the ability to store the patient’s response , automatically analyze and print the results and track patient database.

8. Automatic Audiometer An automatic audiometer has the capability of automatically changing the signal level based on the response of the patient.

9. Parts Of Audiometer Oscillator Attenuator Interrupter switch Frequency dial Stimulus or Tone switch Output selector Input selector Talk back

10. Oscillator The oscillator generates pure tone , usually at discrete frequencies at the octave and mid octave frequencies of 125 , 250 , 500 , 700 , 1000 , 1500 , 2000 , 3000 , 4000 , 6000 and 8000 Hz. Some audiometer do not include all of these frequencies Other audiometers extend to higher frequencies Variations may be + or – 3% (485-515) The oscillator is controlled by some form of frequency selector switch.

11. Attenuator The attenuator controls the intensity level of the signal , usually in 5 dB steps from -10 dB to a maximum output level that varies by frequency and transducer type Typical maximum output level for earphones are : 85 dB at 125Hz , 105 dB at 250Hz etc. Typically maximum output levels for bone conduction vibrator are 65dB at 500Hz & 80 dB at 1000Hz.

12. Interrupter switch This switch is used by the tester to present the tone to the patient . The switch when pressed turns the tone on and when released turns the tone off . The interrupter switch is spring loaded and hence returns to its off position when relese it. By using this switch , the tester can decide when to present the tone and what should be the duration of presentation.

13. Frequency Dial It is used to select the different frequencies of the stimulus. T he various frequencies generated for testing procedure are indicated on the selector the frequency commonly available on the selector are 125, 250 ,500 , 1000 , 2000, 4000, 8000Hz etc. On the frequency selector dial of most audiometers a small number printed under the frequency designation indicates the maximum hearing level that is available for the specific frequency.

14. Stimulus or Tone Switch It is used for presenting continuous tone. Eg – Warble tone / Pulse tone Output selector Using this switch , the tester can select left earphone , right earphone or bone vibrator for presenting tone. Input selector Is is used to select speech /tone / noise. Talk – Back Selection of switch to present sound through mike

15. THE END

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