100 FONIX FP35 Hearing Aid Analyzer
Advanced ANSI Menu
Reach the following menu choices by pressing [NEXT] while the main menu is
open.
HDIST 12DB—Status of the harmonic distortion rule. The ANSI standard states
that when measuring harmonic distortion, if the amplitude of the response
curve at second harmonic of the distortion frequency is 12 dB greater than the
response curve at the distortion frequency, the harmonic distortion measure-
ment should be ignored. Choose ON to apply this rule. Choose OFF to ignore
this rule.
PREDELAY TIME—The delay after the first tone is presented and before the first
measurement is taken. See Section 2.4 for more information.
SHORT SETTLE—The time delay between the frequencies of a pure-tone sweep
and input/output curves.
LONG SETTLE—The time delay between the frequencies of a three frequency
average and distortion measurements.
IO PREDELAY TIME—The delay after the first tone is presented and before the
fire measurement is taken in an input/output curve. This selection is only avail-
able when the aid type of the hearing aid is set to AGC or ADAPTIVE.
IO SETTLE—The delay after the second tone (and all subsequent tones) is
presented and before the measurement is taken in an input/output curve. This
selection is only available when the aid type of the hearing aid is set to AGC or
ADAPTIVE.
PRINT LABEL— Status of the printing label. Choose ON or OFF.
PRINTER— Printer used for printouts. Choose INTERNAL to use the built-in
thermal printer. Choose EXTERNAL to use an attached laser or ink-jet printer.
4.2 IEC Testing
The IEC 118-7 standard was designed by the International Electrotechnical
Commission to assess hearing aids. The performance part of that standard can
be included as an automated sequence on your FP35.
Press [F4] from the Opening Screen of the FP35 analyzer.
4.2.1 Viewing the IEC Display
Refer to Figure 4.2.1A and Figure 4.2.1B for the following explanation of the
graphical display.
1. OSPL 90 curve: full-on gain frequency sweep taken at 90 dB SPL.
2. FOG: full-on gain curve taken at 50 or 60 dB SPL. Select with [F2].
