Frye FONIX 7000 - Manual (Page 116)

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FONIX 7000 Hearing Aid Analyzer
Here are the main differences between ANSI 87 and ANSI 96:
• AGC aids are tested at reduced reference test gain in ANSI 96, but tested
at full-on gain in ANSI 87. This will have an effect on nearly all measure-
ment results in the ANSI test sequence.
• The input/output and attack & release measurements are performed at up
to five different frequencies in ANSI 96. ANSI 87 only measures those
functions at 2000 Hz.
• ANSI 96 measures the telecoil function of all aids using a telecoil device
with a stronger magnetic field than the telecoil device used by ANSI 87,
and a whole frequency sweep of measurements is performed in ANSI 96,
instead of only one measurement at a single frequency in ANSI 87.
Here are the main differences between ANSI 96 and ANSI 03:
• In ANSI 03, the frequency response curve is always measured at 60 dB
SPL. In ANSI 96, AGC aids are tested at 50 dB SPL.
• At the beginning of an ANSI 03 test, AGC aids should be set to have mini-
mum compression. Just before the I/O and attack and release measure-
ments, the analyzer will pause to let you turn on the compression con-
trols to maximum.
• The EIN measurement uses a 50 dB SPL input instead of a 60 dB SPL
input. This should give better results of AGC aids with knee points
between 50 and 60 dB SPL.
• In ANSI 96, full-on gain is measured at 50 or 60 dB SPL for linear aids
and 50 dB SPL for AGC aids. In ANSI 03, full-on gain is always measured
at 50 dB SPL.
• The ANSI 96 Simulated Telephone Sensitivity (STS) measurement is
called Relative Simulated Equivalent Telephone Sensitivity (RSETS) in
ANSI 03.
5.1.1 Leveling for ANSI
Before you run an ANSI test, you should make sure the sound chamber is lev-
eled. Even if the screen says that the chamber is leveled, it is a good idea to
periodically re-level it to account for any differences that might have entered
into the testing environment.
The ANSI standard requires that you do a special leveling that accounts for
everything that will be in the chamber during the test. (For most practical office
settings, the leveling procedure explained in Section 3.2 is adequate.
1. Place the dummy microphone (a black cylinder, provided when ANSI
Option is ordered) into the coupler.
2. Attach the hearing aid to the coupler in the way appropriate for the type of
aid under test. See Section 3.3.