FONIX® FP35 Touch - Frye Electronics

160 FONIX FP35 Hearing Aid Analyzer
3. Press [NEXT] twice to enter the Custom menu.
4. Make sure that DISTORTION is OFF. Use the arrow keys to make this selection
if necessary.
5. Use [,] to select IM FREQ DIFF.
6. Use [,] to select the fixed distance between the primary and secondary frequencies
used in the measurement. You can choose from no distance (HARM)
to 4000 Hz.
7. Press [EXIT] to return to the real-ear measurement screen.
8. Press and hold down [F4]. This will pop up a list of the available selections,
including DIST.
9. Use [,] to select DIST.
10. Press [START/STOP] to make the selection.
11. Use [,] to select the RMS source of the test. Each frequency will have an
amplitude 3 dB less than the RMS source.
12. Set up the client, the aid, and the analyzer for real-ear testing. Make sure to
level the sound field speaker.
13. Press [START/STOP] to start the static IM distortion measurement. See Figure
5.7.3.1.
14. Use [,] to change the primary frequency of the test. The secondary frequency
will also change, remaining a fixed distance (selected in Step 6) away from
the primary frequency.
15. Press [START/STOP] to stop the measurement.
Figure 5.7.3.1—Real-Ear static IM distortion test