Chapter 7 181
The Audiometer Option
7.1 Introduction
The audiometer option on the FP35 turns your hearing aid analyzer into a type
5 screening audiometer. In other words, you can use the FP35 for doing pure-
tone air conduction screening using either insert earphones or sound field test-
ing. It is not intended for use as a clinical audiometer.
7.2 Equipment
The audiometric testing is performed using either a sound field speaker or one
or two insert earphones. If you use two earphones, you can set your client up
with two earphones and perform your measurements one ear at a time. If you
use one earphone, take the set of measurements for one ear, then switch the
earphone into the other ear and take the other set of measurements. TDH head-
phones are not supported on the FP35.
7.3 Setup
The following describes how to set up the FP35 for audiometric measurements.
If you are using the sound field speaker as the transducer, you must first level.
This is described in Section 7.3.1. The insert earphone setup is described in
Section 7.3.2.
7.3.1 Sound Field Speaker
There are two methods to leveling the sound field speaker for audiometric mea-
surements. The first method, called the head surface method, is identical to the
leveling method used for real-ear measurements – it is performed with the cli-
ent present and the reference microphone in position above the client’s ear. The
second method, called the free field method, is performed with the microphone
positioned in front of the sound field speaker without the presence of the client.
Head Surface Method
1. Set up your FP35 analyzer as you would for real-ear measurements with the
sound field speaker in place. See Section 9.2.
2. Situate your client with the sound field speaker at a 45º or 0º angle azimuth.
See Figure 7.3.1A. We recommend a testing distance of 12 inches from the
sound field speaker. You can test at longer distances but it will limit the
maximum output possible.
3. Enter the Audiometric Entry Screen by pressing [F2] and using the [NEXT]
and [BACK] keys as necessary.
4. Press [MENU].
5. Select EAR and choose the desired ear.
