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audiology - chap 4
audiometer calibration
| Question | Answer |
|---|---|
| equipment should be calibrated how often | once a year to make sure it meets ANSI standards |
| who does the calibration | technicians from the manufacturer calibrate it via electroacoustic measurements |
| calibration testing | 1.intensity 2.frequency 3.linearity of attenuator dial 4.amount of harmonic distortion 5.timing 6.overshooting 7.unwanted acoustic radiation 8.masking 9.speech circuit 10.bone vibrator 11.sound fields |
| frequency | if oscillator is reading wrong by 1Hz it's okay if off by 1KHZ, not okay |
| intensity | attenuator dial |
| frequency | oscillator if off by 1Hz no problem |
| linearity of attenuator dial | is the dB jump really 5db |
| amount of harmonic distortion | when a tone is presented at a loud level |
| timing | rise and fall time of the signal ex: if tone comes on too fast, there is a click. you don't want the click and you don't want the tone to gradually get louder |
| Overshooting | an initial jump in loudness |
| unwanted acoustic radiation | when no tone is presented but the person can hear a low or faint sound in the headphone |
| masking | a noise you can present to the ear not being tested |
| speech circuit | for speech audiometer |
| bone vibrator | test circuitry |
| sound fields | through loud speaker and circuitry |
Created by:
schaunag
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