Reference Test Gain - Interacoustics Affinity 2.0 Additional Information

2.0
Affinity Additional Information
3.7.8

Reference Test Gain

Reference Test Gain is a control position which is usually set after doing the high level measures such as
OSPL90 and Full-on gain. If this is the case the result is a basic frequency response (IEC 118-0) or
frequency response curve (ANSI S3.22). If using the IEC the volume control is adjusted against a 1.6 kHz
tone which with an input of 60 dB should produce an output 15 dB less than the OSPL90 at the same
frequency. For hearing aids fitted to very high frequency hearing losses the reference test frequency is
changed to 2.5 kHz. In the ANSI standard the procedure is identical; only the test is run at three frequencies
1, 1.6, or 2.5 kHz. The HIT440 Setup allows for applying both the ANSI and IEC procedure depending on the
preference of the professional. A customized version combining elements from the two may also be
established.
Reference Test Gain is performed as described in section 3.7.1. While the test is running adjust the volume
control to the target line.
Below is an example:
Select test
Adjust the hearing aid volume
control until the bar reaches the
target line.
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