Interacoustics AC40 Instructions For Use Manual page 27

AC40 Instructions for Use - US
sometimes also referred to as SDS (Speech Discrimination Scores) and represents the number of words
correctly repeated expressed as a percentage.
Note that there is a predictable relationship between the patients pure tone threshold and speech
threshold. Speech audiometry may therefore be useful as a cross-check of the pure tone audiogram.
The speech screen set up in graph mode using live voice/MIC (27) - under Setup (19).
Hold in the Mic (27) and CD (28) button in to adjust the live voice or CD input level. Adjust the levels for
the until you reach an average of approximately 0 dB VU on the VU meter.
If the speech and calibration signal are not the same level, it must be manually corrected.
The speech screen set up in table mode using wave files (26) - under Setup (19).
Function Key
10
11
Description
Only available if High Frequency is available (optional license) on the
instrument. Selects the HF phone connected to the separate HF connectors.
Choose between HL, MCL and UCL by holding the Function Key (10) and
select the required measuring type by using one of the rotary wheels (56)/(57).
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