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AA222 Instructions for Use – US Page 27

3.6 Operating instructions – Impedance

3.6.1 Calibration cavities

You can use the 0.2ml, 0.5ml, 2.0ml and 5ml for v daily validity checking of the probe calibration.

To perform a calibration check, select a protocol that measures a tympanogram.

Do not use an ear tip! Place the probe tip completely into the cavity. Perform the measurement. Check the

volume that was measured.

The permitted tolerance in the volume measurement is ±0.1ml for cavities up to 2ml and ±5% for larger

cavities. These tolerances are applicable for all probe tone frequencies.

We strongly recommend calibrating probe and contra phone at least once a year.

3.6.2 Handling and selection of ear tips

When using the AA222 probe and CIR contra phone, Sanibel

ear tips must be used.

The Sanibel

ear tips are single use only and should not be reused. Reuse of ear tips can lead to the

spread of infection from patient to patient.

The probe and CIR contra phone must be fitted with an ear tip of a suitable type and size before testing.

Your choice will depend on the size and shape of the ear canal and ear. Your choice may also depend on

personal preference and the way you perform your test.

When performing a quick impedance screening test you may choose an umbrella-shaped ear

tip. Umbrella ear tips seal the ear canal without the probe tip going into the ear canal itself.

Press the ear tip firmly against the ear canal so that a good seal is maintained throughout the

entirety of the test.

For more stable testing, we recommend using an extension cord with a mushroom-shaped

ear tip. Make sure that this ear tip inserts completely into the ear canal. Mushroom-shaped

ear tips allow you to test ‘hands free’ from the AA222. This reduces the chance of contact

noise disturbing the measurement.

To optimize the stability of the measurements, it is recommended to not hold the probe between the fingers

during the?testing. Acoustic reflex measurements, in particular, could be affected by probe movements.

CAUTION

Interacoustics AA222 User Manual

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