AUDIOMETRY PREPARATION
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OM033-4 - CA850 Series 5 Operating Manual
4
AUDIOMETRY PREPARATION
Refer to the various audiometric standards and other relevant publications for guidance on audiometric testing.
4.1
AMBIENT CONDITIONS
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 above 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 (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 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.
4.4
PATIENT INSTRUCTIONS
The patient should be given the following instructions using the TALKOVER function:
In the case of “Manual” or “Computer” testing, to press and release the response switch when a tone is
heard
In the case of “Bekesy” testing, to press the response switch when a series of pulses are heard and to
release when the pulses are no longer heard
Operator
Audiometer
Computer (optional)
Patient, wearing headset
Headset lead
Response switch & lead
