audiometer calibration
Help!
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| equipment should be calibrated how often | once a year to make sure it meets ANSI standards
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| who does the calibration | technicians from the manufacturer calibrate it via electroacoustic measurements
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| 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
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| frequency | if oscillator is reading wrong by 1Hz it's okay if off by 1KHZ, not okay
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| intensity | attenuator dial
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| frequency | oscillator if off by 1Hz no problem
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| linearity of attenuator dial | is the dB jump really 5db
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| amount of harmonic distortion | when a tone is presented at a loud level
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| 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
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| Overshooting | an initial jump in loudness
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| unwanted acoustic radiation | when no tone is presented but the person can hear a low or faint sound in the headphone
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| masking | a noise you can present to the ear not being tested
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| speech circuit | for speech audiometer
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| bone vibrator | test circuitry
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| sound fields | through loud speaker and circuitry
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