Real-Ear Measurements 103
5.7.2 Taking the FOG measurement
1. Follow the instructions found in Section 5.2 to generate a real-ear target.
2. Press F7 to enter the Target 2-cc screen.
3. Use F2 to select whether or not you want to use the KEMAR average unaided response to
generate the 2-cc target, or the client’s measured unaided response. To measure the client’s
unaided response, follow the instructions found in Section 5.3.2.
4. Decide whether you want to use the average RECD data to create the 2-cc targets or the cli
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ent’s measured RECD. To measure the client’s RECD, follow the instructions found in Section
5.6.1.
5. Use F4 to select the aid type.
6. Adjust reserve gain by turning the FREQUENCY knob clockwise until cursor reaches the bot
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tom of the Target Coupler box in the middle of the display. Use the AMPLITUDE knob to
change the amount of reserve gain.
7. Use the FREQUENCY and AMPLITUDE knobs to modify the 2-cc target, if desired. See
Section 5.7.6 for some suggested vent corrections.
8. Use F6 to select the source level.
9. Place the hearing aid in the chamber and measure the response by pushing START. The ana
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lyzer will use the source type last used in the Probe screen.
Other functions & Notes
• Press F8 to clear any modifications made to the target with the AMPLITUDE and FREQUENCY
knobs.
• Press F9 to select how the screen is printed before any measurements are taken. FULL print
shows both the unmodified target curve, the modified target curve (if applicable), and the
modification table. PARTIAL only prints the modified target curve.
• Several choices disappear after you push START to make the measurement. Should you for
any reason wish to return to the previous screen, push F1 — FOG MODE
5.7.3 Viewing the SSPL 90 screen
Figure 5.7.3 contains a picture of the SSPL 90 screen.
1. SPL graph containing UCL values converted to dB SPL.
2. Column of frequencies.
3. Column where you can enter modifications to the SPL values.
4. Numerical UCL dB SPL data.
5. Selected coupler.
6. Selected fitting rule.
