Frye FONIX FP35 User manual

Testing Automatic Telecoil Hearing Aids
with the FONIX FP35 Hearing Aid Analyzer

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In some hearing aids with an automatic telecoil feature, the
magnet in the FP35 speaker can accidentally enable the telecoil
feature when performing coupler measurements. The easiest
way to test these hearing aids is to disable the automatic telecoil
feature. However, if this is not possible, you can use the follow-
ing method as a workaround.
FP35 coupler measurements can be performed with the sound
chamber speaker in the upright position as if you were perform-
ing a sound field measurement. You will typically need some
sort of stand in order to hold the hearing aid and coupler in
Testing Automatic Telecoil Hearing Aids with
the FONIX FP35 Hearing Aid Analyzer

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place during the measurement. You can purchase a table top
stand from Frye Electronics (part number 030-0021-00) for this
purpose.
To set up the hearing aid for testing:
Mount the internal speaker in the sound field position as1.
you would for performing real-ear measurements.
Place the stand in front of the sound field speaker and attach2.
the coupler microphone to the stand using BLUE STIK (Fun
Tak). There should be a distance of 4-6 inches (10-15 cm)
between the microphone and the speaker. If you have a short
microphone cord, this may limit the distance allowed. See
Figure 1.

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Figure 1: Leveling for coupler measurements using a sound field speaker
From the Opening Screen on the analyzer, press [F3] to enter3.
the Coupler Multicurve screen.

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Press [MENU] to enter the local menu and [NEXT] to go4.
to the advanced local menu. Use the arrow keys to adjust
the LEVELING SOURCE to 70 dB SPL. (If you are in the
Advanced User Mode, you will need to press [NEXT] again to
enter the custom local menu to adjust this setting.)
Press [MENU] again to close the local menu.5.
Press [F5] and [START/STOP] to level the sound field speaker.6.
Attach the hearing aid to the coupler in the usual fashion7.
and insert the coupler microphone. See the FP35 Operator’s
Manual for details.
Attach the hearing aid/coupler combination to the stand using8.
BLUE STIK (Fun Tak) with the hearing aid microphone where
the coupler microphone was during the leveling process. See
Figure 2.

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Figure 2: Performing coupler measurements using a sound field speaker

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You can now perform your coupler measurements as usual9.
(ANSI, IEC, or Coupler Multicurve). This testing method
is more susceptible to environmental noise than when the
sound chamber is closed, so make sure you keep your office
as quiet as possible during these measurements.