RM500SL
®
User's Guide Version 3.4
June 2011
8 ANSI S3.22 Hearing Aid Tests
Section overview
These tests follow the procedures of ANSI S3.22-1996 or ANSI S3.22-2003 as selected in
Setup. See 1996 or 2003 ANSI standard :
Linear:
An automated test sequence for linear hearing aids per ANSI S3.22.
AGC:
An automated test sequence for AGC hearing aids per ANSI S3.22.
Input/Output:
1 - 4 curves of coupler SPL vs input SPL at .25, .5, 1, 2 and 4 kHz.
Telecoil:
Tests for telephone sensitivity and test loop sensitivity using a telephone
magnetic field simulator (TMFS) and a large coil in the test chamber floor.
ANSI S3.22-1996 facts
The RM500SL performs selected hearing instrument tests in accordance with ANSI
S3.22-1996. This standard expresses some outputs and gains as High Frequency Average
(HFA) values. The HFA is the average of values at 1000, 1600 and 2500 Hz. If a hearing aid
meets certain conditions, the manufacturer may choose other averaging frequencies called
Special Purpose Average (SPA) frequencies. The current averaging frequencies are
indicated explicitly on test results where space permits and also appear as tick marks on
the frequency axis of graphs. To change the averaging frequencies, see ANSI test
frequencies.
This standard also requires some tests with the gain control full on and some with the gain
control in the Reference Test Position (RTP). This requirement applies to both Linear and
AGC aids that have a HFA (or SPA) full-on gain greater than the HFA (or SPA) OSPL90
minus 77 dB. Otherwise the RTP is full on. If required, the RM500SL will pause in its
testing and guide you in setting the gain control to the RTP.
All other controls on the hearing instrument should be set to provide the widest frequency
response, the greatest gain and the highest maximum output. AGC controls and/or
programmable parameters should be set as designated by the manufacturer.
At full-on gain the
[Linear]
and
[AGC]
test sequences provide a curve of OSPL90 (Output
Sound Pressure Level for a 90 dB input SPL), the HFA (or SPA) and peak value of this
curve, the frequency of the peak and the HFA (or SPA) gain for a 50 dB input SPL.
With the gain control at RTP, these sequences also provide a frequency response curve with
an input SPL of 60 dB (Linear) or 50 dB (AGC), the HFA (or SPA) gain for a 60 dB input
SPL, the frequency range, battery drain, equivalent input noise, harmonic distortion, attack
and release time (AGC only).
ANSI S3.22-2003 facts
ANSI S3.22-2003 has been designated a recognized standard by the FDA but is not yet
mandatory. Manufacturers may use either version for reporting test data.
The most significant change from the 1996 version is the requirement for the hearing aid to
be set in its most linear mode for the setting of the gain control to Reference Test Setting
(changed from Reference Test Position) and for all tests except attack and release and
input-output (I/O) curves. These two tests are to be conducted with the AGC function set for
maximum effect. The AGC test sequence will pause to allow AGC to be set prior to
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Summary of Contents for RM500SL
Page 1: ...RM500SL User s Guide Version 3 4 March 2010...
Page 9: ...RM500SL User s Guide Version 3 4 June 2011 EC Declaration of Conformity 9...
Page 10: ...RM500SL User s Guide Version 3 4 June 2011 10...
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Page 43: ...RM500SL User s Guide Version 3 4 June 2011 telecoil test 43...
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Page 78: ...RM500SL User s Guide Version 3 4 June 2011 Screen tour unaided screen 78...
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