Frye FONIX FP40D User Manual

Page 72

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FONIX FP40 Portable Hearing Aid Analyzer

5. Press F7 to select the battery type used in the measurements.

6. Press F8 to select whether or not you want to perform an equivalent input noise (EQIN also

known as EIN) measurement.

Note: The equivalent input noise measurement is difficult without a very quiet environment,
especially with low gain aids.

7. Decide whether you want to test with or without the reference microphone. See Section 3.4.9

for instructions on the reference microphone.

4.3.2 Running the test sequence

1. Level the sound chamber, if necessary. See Section 3.2 for details.

2. Set up the aid for testing. See Section 4.2.1.

3. Close the sound chamber.

4. Press START/STOP when you are ready to begin the test.

5. If you turned on the telecoil test:

a. Plug the external telecoil board into the external speaker jack on the back of the FP40.
b. Set the aid to receive telecoil signals
c. Position the aid and coupler on the telecoil board so that the TCOIL reading on the display

is as large as possible.

d. Press START/STOP to take the measurement.
e. Return the aid and coupler assembly to the sound chamber, and put the aid back to micro-

phone mode.

f. Unplug the telecoil board.
g. Press START/STOP to resume the test.

6. Wait for several tests to be run. For most linear aids, the analyzer will pause after performing

several measurements in order for you to turn down the gain of the aid.

7. If the analyzer pauses, open the sound chamber and adjust the gain control of the aid until

the HFA (or SPA) MEASURED gain matches the HFA (or SPA) TARGET gain to within 1 dB
when the sound chamber is closed.

8. Press START/STOP to complete the test sequence.

4.3.3 Viewing the results

See Figure 4.3.3 for an example of ANSI 87 results

1. SSPL90: Output measurement at 90 dB SPL

2. RESP50 (or 60): Response measurement at 50 (or 60) db SPL

3. NR: Noise reduction used in tests

4. SPA/HFA: Frequencies used for the three frequency average

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