200 FONIX FP35 Hearing Aid Analyzer
Coupler Microphone
For the coupler microphone, you will need a sound level calibrator such as the
Quest QC-10.
1. Press [F3] to enter the Coupler Multicurve Mode from the Opening Screen.
2. Use [F4] to choose NORM.
3. Press [MENU].
4. Set REF MIC to OFF, if necessary, using the arrow keys
5. Press [NEXT] to enter the Advanced Menu. Set STATIC TONE to SINGLE.
6. Press [EXIT] to return to the Coupler Multicurve Screen.
7. Press [∨] repeatedly until the single tone is turned off.
8. Use the microphone adapter supplied with the FP35 to fit the coupler micro-
phone into the calibrator, and turn the calibrator on.
9. Observe the output. If it matches the specified amplitude level of the cali-
brator within ±1 dB, the coupler microphone is not out of calibration.
Note: if you are using a calibrator that uses a signal with a frequency not divis-
ible by 100 Hz, you will need to check the calibration in the microphone cali-
bration screen.
Probe Microphone:
1. Press [F3] to enter the Coupler Multicurve
Mode from the Opening Screen.
2. Press [MENU].
3. Use the arrow keys to set:
DISPLAY—GAIN
NOISERED (TONE)—16X
REFMIC—ON
4. Press [EXIT] to return to the Coupler
Multicurve Screen.
5. Locate the calibration clip and fasten it to
the top edge of the coupler microphone.
6. Insert the probe tube through the tube on
the clip until the tip of the probe is at the
center of the coupler microphone grid
(Figure C-1).
7. Put both microphones into the sound cham-
ber and close the lid.
8. Set the source level to 70 dB or higher, using the arrow keys.
9. Select NORM with [F4]
10. Push the [START/STOP] button.
Figure C-1—Attaching the probe to
the reference microphone
