User's Manual

26
Before a fitting procedure can be carried out using the RECD unit, the
operator must always begin with the acquisition of an RECD curve, so that
all the measurements made with the coupler can effectively simulate those
normally obtainable in the ear.
The software will enable the coupler measurement functionality only after
the acquisition of an RECD curve has occurred.
The acquisition of an RECD curve involves two steps: measurement of a
response in the ear and measurement of a response in the coupler. In
particular, acquisition of the response measurement in the ear can be
accomplished in two ways: using a disposable tip or using the earmold of
the patient's own hearing aid. If the first option is selected, the probe tube
must first be inserted in the auditory canal of the patient as described in
Heading 2.3.1, following which the disposable tip, connected previously to
the insert transducer, can be placed in the ear. This particular step must be
carried out with special care, to ensure that the probe tube inserted
previously is not displaced overmuch. The correct position of the tube and
the transducer is illustrated in the following image: