48 FONIX FP35 Hearing Aid Analyzer
Figure 2.5.7—External sound field speaker setup
To set up your FP35 software to use an external speaker:
1. Press [MENU] from the Opening screen to enter the Default Settings menu.
2. Press [NEXT] to enter the Advanced Default Settings menu.
3. Select SPEAKER under REAL-EAR and/or COUPLER with [
∨, ∧] keys. Use
[<, >] to make the selection. The SPEAKER selection under REAL-EAR
selects whether the INTERNAL or EXTERNAL speaker will be used for real-
ear measurements. The SPEAKER selection under COUPLER selects whether
the INTERNAL or EXTERNAL speaker will be used for coupler measure-
ments. The AUTO selection chooses the internal speaker for sound chamber
measurements and the external speaker for real-ear measurements.
4. Use [F5] to save the settings to permanent memory.
5. Press [EXIT] to return to the Opening screen.
You can also set the speaker selection by using the SPEAKER menu item in the
Advanced or Custom menu of most measurement screens. (Press [MENU] from
the measurement screen and press [NEXT] once or twice until the setting is
shown in the menu.)
2.5.8 Measuring Telecoil
The telecoil function of a hearing aid can be measured by using an external
telecoil board of by using a Telewand. These are both optional accessories that
can be plugged into the earphone jack.
In February 2007, a new rear panel was introduced on the FP35 analyzer. The
earphone jack connector was changed from 3.5 mm to 1⁄4 in to match the stan-
