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0611 RM500SL User’s Guide Version 2.8 Page 42
8.7 ANSI input-output curves
FastFacts 8.7: ANSI input-output curves
An input/output curve shows the output level of a hearing instrument as a function
of input level and frequency. It is a steady-state pure-tone curve and does not
reflect performance with complex signals such as speech.
You may run the tests at any setting of the instrument controls but ANSI S3.22
requires that certain settings be used. See 8.2: ANSI S3.22-1996 facts and 8.3:
ANSI S3.22-2003 facts. The [Input/Output] test allows you to generate up to 4
separate input/output curves at each of 5 individual frequencies (250, 500, 1000,
2000, 4000 Hz) as provided in ANSI S3.22.
1) Press <Tests>, then highlight and <PICK> [Input/Output].
2) Refer to 7.11: Coupling the hearing instrument, 7.12: Positioning the hearing
instrument and 2.5: Battery pill use and care to prepare the instrument for
testing.
3) Turn the instrument ON; set AGC controls or programming parameters as in
8.4: ANSI 1996 Linear and AGC tests or 8.5: ANSI 2003 Linear and AGC tests
4) Highlight and <PICK> [Curve 1]. Test setup instructions will be displayed.
5) Press <Continue> to generate a set of 5 input/output curves.
6) To measure another set of 5 input/output curves, highlight and <PICK> another
[Curve #].
7) To summon a cursor to determine curve values, position the mouse pointer on
a graph area and click the left mouse button. Click again to turn it off.
NOTE: Noise in the test area may cause erroneous results at low input levels
(particularly at 250 and 500 Hz). Ensure that the test chamber is well sealed and
ambient noise is low.