118 FONIX FP35 Hearing Aid Analyzer
5.2.7 Testing Digital Aids
The FP35 seamlessly incorporates the testing of digital hearing aids into its nor-
mal testing procedures.
If you have the Composite/Digital Speech Option, just follow the steps outlined
in Section 5.4.4 (Insertion Gain) or Section 5.5.2 (SPL), choosing a signal source
of DIG SPCH with [F4] in the Real-Ear Testing Screens. The Digital Speech
signal is an interrupted composite signal designed to imitate the rhythms of
speech. The aid will respond to Digital Speech as it would respond to actual
speech, without lowering the gain of the hearing aid. See Appendix F for more
details.
If you do not have the Composite Option, put the aid into “test” mode via its
programming software. You should also set the AID GROUP to ADAPTIVE. This
will automatically use the SLOW pure-tone warble, which has been adjusted for
the group delay of digital hearing aids.
1. Press [MENU] from a measurement screen.
2. Change AID GROUP to ADAPTIVE using the arrow keys.
3. Press [EXIT] to return to the measurement screen.
See Section 2.5.1.4 for details on pure-tone warbling.
5.2.8 Testing Body Aids
The setup below is recommended for Body aids. Follow normal insertion gain
measurement procedures.
REFERENCE MIC
PROBE MIC
TOP VIEW
12"
SPEAKER
REFERENCE MIC
SIDE VIEW
PROBE MIC
(ON EARHOOK)
BODY AID
(FACING FORWARD)
SPEAKER
(HEAD HIGH)
12"
Figure 5.2.8—Setting up a body aid for real-ear testing
