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66 FONIX FP35 Hearing Aid Analyzer
Figure 3.4.1A shows a completed normal pure-tone sweep.
Example
Following the instructions above, run 4 Gain curves using amplitudes 50, 60,
70, and 80 dB SPL. Use a signal source of NORM, COMP, or DIG SPCH.
This scenario will provide you with a family of curves. Whenever the curves sit
on top of each other, the gain of the aid is the same for the amplitudes of those
curves. This indicates the aid is running linearly. If the curves provide progres-
sively less gain as the input rises, then the aid has some sort of compression cir-
cuit. Figures 3.4.1B and 3.4.1C show two examples of this scenario.
Figure 3.4.1B—This aid has very little compression between 50 dB and 90 dB.