FONIX® 8000 - Frye Electronics

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126 FONIX 8000 Hearing Aid Test System Lid Speaker Special foam configuration Microphone connection Figure 6.1.1—8120 Polar Plot Chamber 8120 Polar Sound Chamber BTE hearing aid Rotating shaft The hearing aid is attached to the coupler and measurement microphone and placed on the rotating shaft inside the cavity of the chamber. The shaft itself can be easily removed by pulling it firmly upward from the base. Two types of hearing aid rotation shafts are provided: • BTE Rotating Shaft: This shaft (shown in Figure 6.1.1) is nearly cylindrical with a flatted surface on one side containing four small magnets. A fifth magnet is located on the top of the shaft for attachment of the Positioning Saddle that is used to hold the BTE hearing aid in place during testing. The HA2 coupler has a steel plate that is held by the magnets to the flatted portion of the shaft. • ITE Rotating Shaft: This shaft contains a flat steel bar fitted with four magnets. The matching HA-1 coupler has a flat steel plate that attaches to these magnets. See Section 6.3 for information on setting up the hearing aid in the 8120 Polar Plot Sound Chamber. The foam surrounding the cavity inside the 8120 Polar Plot Chamber is designed to provide low levels of reflected sound over a wide band of acoustic frequencies. At the beginning of the test, the hearing aid is positioned so that it is pointed towards the speaker at the back of the chamber. During the test, the shaft will automatically rotate the hearing aid in a 360° circle counterclockwise, stopping periodically to collect measurement data. When the test is completed, this rotation will automatically reverse and return the hearing aid to the starting position to prevent the microphone cord from tangling around the shaft.
Coupler Directional Testing 127 The coupler microphone uses a connector placed inside the chamber in order to eliminate the need for cords to exit the chamber and possibly break the chamber seal. If it is necessary to connect the hearing aid to an external cable, it is recommended that the cable exit the sound chamber at the front or at the rounded corner near the rear of the lid. This will minimize the chance of damage to the cable due to the sheer force applied by the chamber seals. When the clinician wants to perform “normal” hearing aid testing, such as ANSI or IEC automated test sequences or Coupler Multicurve measurements, the removable Chamber Basket can be placed over the cavity to create a horizontal, flat test surface. See Section 3.2.2 for more details. 6.2 Leveling Leveling is the process by which the response of the sound chamber is measured and computer-corrected so that a “flat” sound field is achieved. When performing a polar plot or difference measurement, the hearing aid is positioned on the rotating shaft inside the 8120 Polar Plot chamber. This positioning is different than during a typical hearing aid test in which the 8120 Removable Test Surface is used and the hearing aid is positioned on the horizontal surface. It is important to level the sound chamber in the setup that you are going to use for the coupler measurements. This section describes how to level the sound chamber for polar plot and difference measurements. See Section 3.2.2 for leveling instructions for measuring the hearing aid using the 8120 Removable Test Surface and horizontal positioning. 1. Unplug the battery pill and remove the hearing aid, coupler and 8120 Removable Test Surface from the sound chamber. The Rotating Shaft should remain in place inside the cavity of the chamber. 2. Place the coupler microphone on top of the Rotating Shaft at a 90° angle from the speaker. The magnetic surface of the shaft will hold the microphone securely in place. See Figure 6.2. 3. Enter the Directional Polar or Directional Difference screen. (From the Opening screen with the Frye logo, press [F3] to enter the Advanced Coupler Navigation Screen and [F5] to enter the Directional Polar screen or [F6] to enter the Directional Difference screen.) 4. Press [LEVEL] to start the leveling sequence. 5. Look at the display. After a few seconds, the video monitor should display a “Leveled” message in the lower left corner of the screen. If the FONIX 8000 Test System doesn’t level, it could be an indication that your microphone needs to be calibrated or replaced.
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Page 153 and 154: Chapter 7 145 The ISTS Test The IST
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Appendix A 199 Specifications ACOUS
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Specifications 201 Size: 11.5"W x 1
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Appendix C 209 Calibration There ar
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Calibration 211 6. Thread the probe
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Appendix G 223 Glossary of Terms AG
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Glossary of Terms for the FONIX 800
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Glossary of Terms for the FONIX 800
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Appendix H 229 The FONIX Keyboard A
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FONIX® 8000 - Frye Electronics

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