Audioscan Verifit 2 Manuel d'utilisateur télécharger pdf (Page 102)

Verifit

User's Guide Version 4.2 © June 2015

result in the lowest compression threshold, a flat I/O curve and the longest attack/release times. These are not

'typical' characteristics but indicate the adjustment range possible for these parameters.

If you are unsure which test sequence to run, try [AGC] first. If attack and release times are all near zero, the

instrument is probably linear.

ANSI test results

In 1996 tests: Full-on average gain is measured at 50 dB SPL, average gain at RTP is usually (but not always)

measured at 60 dB SPL and the frequency response is run at 60 dB SPL for linear aids or at 50 dB SPL for AGC

aids.

In 2003 tests: Full-on average gain (1) is measured with a 50 dB input SPL, average gain at RTS (2) is always

measured at 60 dB input SPL and the frequency response curve (3) is always run at 60 dB input SPL.

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 ANSI S3.22-1996 facts and 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

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Audioscan Verifit 2 Manuel d'utilisateur Page 102