Audiometer – Equipment, Test, Working & Calibration

An audiometer is a device utilized for assessing hearing sense effectiveness. They normally comprise of a connected physical system fixed to a group of headphones and a observational subject feedback switch, functioned by a controlled Computer System. Similar mechanisms can also be utilized with bone stimulator, to assess conductive hearing behaviors.

Audiometers are recognized devices at ear, nose, throat medical units and in audiology institutes. An option to audiometers physical-wares are soft application’s audiometers, which are accessible from market in numerous & diverse systems. Screening computer oriented audiometers utilize a specific type of computer. Lab computer-oriented audiometers are usually more costly than soft application’s audiometers, but additionally yield correctness and efficiency in results.

Courtesy: Philip Marshall

They are regularly & generally utilized in hospitals, institutions related to audiology  and research centers. These audiometers are also utilized to carry out commercial audiometric assessments. Few audiometers additionally offers an application making provision that offers students with the ability to make their customized diagnostic experiments.

Working: An audiometer usually conveys recorded audios such as uncontaminated sounds or voices to the headphones of the experimenting or assessing subject at changing frequency rates and amplitudes, and keeps the subject’s feed-backs to make an audiogram of phenomenal responsiveness, or voice comprehension stats.

Classifications: Audiometers for medical care normally comes with fixed hardware accessory maneuvered from a computer. Soft Application based audiometers which entirely executed on a computer are there in the market, however their preciseness and provision for assessing hearing deficiency is challenged because of improper calibration provision. The utmost general class of audiometer produces tones without surrounding noises, or conveys components of voice.


Bekesy audiometer is other audiometer type, in which the subject copies a sound of augmenting and thrashing  amplitude as the sound is flown away through the frequency manipulator by De-switching a control when the sound is perceived and switching it when it cannot be perceived, experimenting to achieve the core of hearing. Bekesy audiometry characteristically produces inferior transitions and normal variance than audiometry in pure tone.

International Standards: Audiometer specifications and the test processes are specified in following international standards:

  • IEC 60645-1:2012 Standard | Electroacoustics – Audiometric equipment
  • ISO 8253-3:2012 – Acoustics — Audiometric test methods
  • ANSI S3.6-2010, Specifications for Audiometers

What to check When Buying Audiometers:
Those looking to buy audiometers should consider following before making a purchase:

1. Audiometers for Higher-end are mostly complicated to employ and comprises of intricate algorithms that is not suitable for every medical processes.

2. Voice audiometer reading should not be utilized in audiometers manufactured for screening objectives. Audiometers type Pure-tone should be employed for testing at range of five hundred to six thousand hertz.

3. Normal medical audiometer examination is done over a frequency of tho hundred and fifty to eight thousand hertz. While not mandated by Occupational Safety and Health Administration, bone-conduction examination for yearly or primary audiograms can be essential in specifying detection in a medical situation.

4. A standard audiometer has a range preciseness & correctness contained by three percent for frequent examinations. For few medical uses, preciseness & correctness contained by one percent is needed.

5. Audiometer for clinical examinations and detection should be at minimum type 3 as designated by ANSI S2.6. Type 1 is additionally specified for clinical situations where a complete range of examination qualification must be attained.

6.  For speech-examination, the audiometer should be selected at minimum of class C.

7. Audiometric examination will need a well standard earphones. If utilized to transmit the wave tone to the subject then they should come with two earphones for both ear.

Audiometer Calibration: The calibrator may contain fake ear connectors and fixtures counting the contemporary IEC 60318-1:2009 (Simulators of human head and ear), AEC201-A (Ear Simulator), the AMC493B (AudioMeter Calibration Couplers) Fake Mastoid, and the contemporary AudioMeter Calibration Couplers i.e. AEC203, AEC202, and AEC204 inlet earphone and listening aid connectors. The calibrator should offer verification of audiometers rapidly and correctly under computer processor mechanism with comprehensive examinations based on ranges in the American National Standards Institute S3.6-2010 Specification for Audiometers.

The Calibrator should execute range and frequency variations throughout audiometer examinations. The calibrator should also assess audiometric enclosure surrounding noise with live time one third octave assessment and quick pass/fail statements. The calibrator should record and present examinations’ results in databases. Also display or yield compiled reports that is calibration certificates for the device owner with its validity & next calibration date.

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