Automated Test Sequences 109
3. Position the hearing aid/coupler assembly in the test chamber with the
microphone of the aid at the reference point of the chamber.
4. Place the test microphone as close as practical to the hearing aid micro
-
phone (3-5 mm). See Figure 5.1.1A.
5. Close the lid of the sound chamber.
6. Press the [LEVEL] button. The sound chamber will level.
7. Exchange the position of the dummy microphone and the test microphone
and plug the battery pill into the battery voltage supply. See Figure 5.1.1B.
Figure 5.1.1A—Setup for leveling
Figure 5.1.1B—Setup for aid testing/ equivalent substitution method
5.1.2 Setting up the hearing aid for ANSI
The hearing aid controls must be set to conform with ANSI requirements for
the test results to be valid.
1. Set the controls on the aid (except for the compression controls) to give the
greatest possible output and gain.
2. Set the aid for the widest frequency response range.
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