Getting Started Guide
APx511 B Series Hearing Instrument Analyzer: Getting Started Guide 39
Running the standard tests
Place the DUT (with the battery simulator installed), the
measurement microphone/coupler combination and the
dummy mic in the chamber.
Follow the prompts in the measurements to set the DUT
volume control to the correct level.
ANSI S3.22 / IEC60118-7
Hearing instrument testing is defined in two standards:
ANSI S3.22 from the American National Standards Insti-
tute, based in Washington, D.C., and IEC60118-7, from the
International Electrotechnical Commission based in
Geneva, Switzerland.
The two standards are largely the same, with only a few
minor differences in methods, values and nomenclature.
Refer to the standard of interest for an explanation of terms
and procedures.
APxHia provides a series of measurements for each stan-
dard, selectable by the Standards buttons.
Measurements for ANSI S3.22
These ANSI S3.22 measurements are supported:
OSPL90 curve
OSPL90 Curve measures coupler output sound pressure
level (OSPL) as a function of frequency, for a 90 dB input
SPL.
HFA OSPL90
HFA OSPL90 displays the high frequency average (aver-
age SPL at 1 kHz, 1.6 kHz and 2.5 kHz) for a 90 dB input
SPL.
Full-On Gain
Full-On Gain (FOG) displays gain for an input of 60
dBSPL when the gain of the hearing instrument is at its full-
on position.
HFA Gain
HFA Gain displays the HFA gain for an input of 60 dBSPL
when the gain of the hearing instrument is at its full-on
position.
Set RTS
An interactive dialog to set the Reference Test Setting,
using the volume control on the DUT.
Frequency Response
Coupler SPL as a function of frequency for a 60 dB input
SPL, with gain control at RTS.
Harmonic Distortion
Ratio of sum of the powers of all the harmonics to the
power of the fundamental at various levels and frequencies.
Equivalent Input Noise
SPL of an external noise source at the input that would
result in the same coupler SPL as that caused by all the
internal noise sources in the hearing aid.
Battery Current
Electrical current drawn from the battery when the input
SPL is 65 dB at 1000 Hz and the gain control is at RTS.
Input Output
For hearing aids with AGC, the coupler SPL as a function
of the input SPL, at one or more of 250, 500, 1000, 2000,
4000 Hz, with the gain control at RTS
Attack and Release
Attack: For hearing aids with AGC, the time between an
abrupt change from 55 to 90 dB input SPL and the time
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