Hearing Instrument Testing Using Hit440; Testing Hearing Instruments - Interacoustics Affinity 2.0 Additional Information

3.6 Hearing instrument testing using HIT440

Hearing Instrument Testing (HIT) is perf ormed to verif y that the hearing aids are technically f unctioning as
they should. It is usually perf ormed af ter f itting the hearing aid or during a repair appointment.
When perf orming HIT there are certain things you should keep in mind to get the best possible result. Some
of these will inevitably also inf luence the precision of the curve obtained. This section will walk through some
important tips and tricks to remember when tasking hearing aids using the HIT440.
The f ollowing section will provide you with general knowledge relevant f or hearing instrument testing using
the HIT440.
Correct placement of a hearing aid in the test box
Positioning the hearing aid correctly in the test chamber is important to obtain precise measurements.
3.6.1

Testing hearing instruments:

4
2
1) Connect either the 2cc coupler or the 711 coupler to the coupler microphone and attach the relevant
adaptor to the coupler. The parts will click easily together.
D-0004576-Q – 2022/05
Affinity/Equinox2.0 – Additional Information
5 6
3
1
Adaptor (BTE) Coupler
1) Coupler microphone
2) Ear simulator/711 coupler (optional)
3) 2cc coupler
4) Adaptor f or body worn hearing aids
5) Adaptor f or BTE hearing aids
6) Adaptor ITE hearing aids
Microphone
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