4 Suggested Sequence of Operation and Test Procedure
The following applies to air conduction measurements. For illustrative
purposes 5dB steps are used. Refer also to ISO 8253 for guidance.
4.1 Audiometry preparation and ambient conditions
Refer to the various audiometric standards and other relevant publications
for guidance on audiometric testing.
Audiometric testing should always be performed in quiet conditions (e.g. a
quiet room or an acoustic booth). The optional Audiocups can provide an
additional level of isolation from ambient noise. For further explanation on
permissible ambient noise levels, please refer to the audiometry standard
ISO6189.
4.2 Test system arrangement
The schematic diagram below shows a typical example of the use of
audiometric test equipment. The audiometer is located on the desk of a
seated operator as shown.
The patient is seated in front of the desk facing away from the operator.
The patient wears a headset or appropriate transducer (see Section 4.3)
and responds to test stimuli by use of a hand-held switch which is also
connected to the instrument.
4.3 Headset
The headset or appropriate transducer must be fitted by a qualified person
to ensure a proper seal and a comfortable fit. The leads from the headset
are connected to the instrument and the headset is then fitted to the
patient.
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