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Section 2: RealEar evaluation with FM system
11. Press [START/STOP] to begin the measurement and again when a stable response is
observed..
12. This curve will be referred to as the Real-Ear Hearing Aid Response or RHA65. See
Figure 2.3.4.
2.3.5 Test FM system with typical input – RFM80
1. Set up the FM system following the instructions found in Section 2.3.1. Set the FM
receiver for FM+ENV. Make sure to level the sound field speaker.
2. Use
[
∨
] to select CRV 2.
3. Use [<, >] to adjust the amplitude of CRV 2 to 80 dB SPL.
4. Press [START/STOP] to begin measurement. Press it again once a stable response is
observed.
5. This curve will be referred to as RFE80 or the Real-Ear FM and Environmental
Response with 80 dB SPL input delivered to the FM microphone.
6. Compare RHA65 (CRV 1) to RFM80 (CRV 2) and confirm that the desired FM
advantage of 7-10 dB is maintained over the 500 Hz to 2000 Hz frequency range, as
shown in Figure 2.3.5. Further adjustments may be made if necessary.
Figure 2.3.5
Comparison of RHA65 (CRV 1) and RFE80 (CRV 2)
