FONIX® 8000 - Frye Electronics

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164 FONIX <strong>8000</strong> Hearing Aid Analyzer • REDD: The real-ear to dial difference (only selectable when REDD is set to CUSTOM) • Target IG: The mid-level target in dB insertion gain 6. Use [F5] to select the signal source if you are modifying the SPL target: • Select the Source Type. Choose between Tone and Composite. Press [START] to make your selection without closing the pop-up window. • Select the Source Level. Choose between 40 through 90 dB SPL. Press [] to make your selection and close the pop-up window. 7. Use the arrow keys to make your modifications to the target. The [, ] keys select the desired frequency, and the [, ] keys modify the amplitude 1 dB at a time. Note: When you edit the Target IG, the Target SPL will also be updated. However, when you edit the Target SPL directly, it will not have an effect on the Target IG. Figure 8.3.6—The Real-Ear Target screen
Real-Ear Measurements 165 8.3.7 Entering an REDD transform The REDD transform affects how dB HL values are converted to dB SPL. to enter a measured reDD value: 1. Enter the Real-Ear Navigation screen by pressing [F2] from the Opening screen or [EXIT] from a real-ear screen (such as the Audiogram Entry screen). 2. Press [F2] to enter the Real-Ear Target screen. 3. Press [MENU] in the Real-Ear Target screen. 4. Select REDD using [, ]. 5. Choose CUSTOM using [, ]. 6. Press [EXIT] to return to the Real-Ear Target screen. 7. Use [F1] to select the desired ear. 8. Use [F2] to select REDD. The REDD column for the selected ear will now be highlighted. 9. Use the arrow keys to input the REDD transform. The [, ] keys select the frequency. The [, ] keys select the amplitude. 8.4 Real-Ear Measurements The <strong>8000</strong> Hearing Aid Test System has three real-ear measurement test screens: Insertion Gain, Real-ear SPL, and Visible Speech. The Insertion Gain and Realear SPL screens are explained in this section. See Section 8.7 for operation of the Visible Speech screen. 8.4.1 Measuring in the Insertion Gain screen Insertion Gain is the most conventional method used for performing real-ear measurements. In the typical insertion gain procedure: 1. The probe tube is inserted into the ear canal. (Section 8.2.3) 2. The sound field speaker is leveled. (Section 8.2.4) 3. The unaided response is measured. (Section 8.4.3) 4. The hearing aid is carefully inserted into the ear. 5. The aided response is measured. (Section 8.4.4) 6. The insertion gain response is compared to the prescribed insertion gain target and any necessary adjustments are made to the hearing aid in order for the response to better match the target. The Insertion Gain screen itself consists of two graphs. (See Figure 8.4.1.) The bottom graph displays an unaided response and up to four aided responses in dB Gain or dB SPL. The top graph displays a prescribed insertion gain target and up to four insertion gain curves. Insertion gain is the difference between the patient’s aided and the unaided responses.
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Page 153 and 154: Chapter 7 145 The ISTS Test The IST
Page 155: The ISTS Test 147 No HL 250 Hz 375
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Page 207 and 208: Appendix A 199 Specifications ACOUS
Page 209: Specifications 201 Size: 11.5"W x 1
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Page 219: 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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Appendix H 229 The FONIX Keyboard A
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FONIX® 8000 - Frye Electronics

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