Audioscan Verifit - Manual (Page 3)

Verifit ® User's Guide Version 3.12  May 2015
ANSI test frequencies ......................................................................................................................................................... 40
Test box calibration facts ................................................................................................................................................... 40
Calibrating test box reference microphone ........................................................................................................................ 41
Calibration check for coupler microphone ........................................................................................................................ 42
Coupling the hearing instrument for ANSI tests ............................................................................................................... 43
Coupling the hearing instrument for Test box Speechmap ............................................................................................... 43
Positioning the hearing instrument .................................................................................................................................... 44
9 ANSI Hearing Aid Tests ...................................................................................................................................................... 45
ANSI S3.22-1996 facts ....................................................................................................................................................... 45
ANSI S3.22-2003 facts ....................................................................................................................................................... 45
ANSI 1996 Linear and AGC tests ...................................................................................................................................... 46
ANSI 2003 Linear and AGC tests ...................................................................................................................................... 46
ANSI test results ................................................................................................................................................................. 47
ANSI input-output curves .................................................................................................................................................. 47
ANSI telecoil terminology ................................................................................................................................................. 48
ANSI telephone simulator (TMFS) test ............................................................................................................................. 49
ANSI test loop test .............................................................................................................................................................. 50
Telecoil test results ............................................................................................................................................................. 50
10 Other Test Box Measures .................................................................................................................................................. 52
Harmonic distortion ............................................................................................................................................................ 52
Noise reduction ................................................................................................................................................................... 52
Feedback suppression test .................................................................................................................................................. 53
Directional function test ..................................................................................................................................................... 54
Directional ITE positioning ................................................................................................................................................ 55
Directional BTE positioning .............................................................................................................................................. 55
Test box directional procedure ........................................................................................................................................... 56
Multicurve procedure ......................................................................................................................................................... 57
Multicurve results ............................................................................................................................................................... 57
Spectral analysis in Multicurve .......................................................................................................................................... 58
Battery drain test ................................................................................................................................................................ 58
Manual control procedure .................................................................................................................................................. 59
Sound level meter using manual control ........................................................................................................................... 60
11 Sensory loss simulator ....................................................................................................................................................... 62
Sensory loss simulator description ..................................................................................................................................... 62
Sensory loss simulator operation ....................................................................................................................................... 62
12 On-Ear Measures - Setup ................................................................................................................................................... 63
External sound-field speaker setup .................................................................................................................................... 63
On-ear calibration facts ...................................................................................................................................................... 63
Calibration of on-ear probe microphone ............................................................................................................................ 64
Calibration check for probe module .................................................................................................................................. 65
Max TM SPL setup ............................................................................................................................................................ 66
ABR nHL to eHL setup ...................................................................................................................................................... 67
Positioning the client .......................................................................................................................................................... 67
Positioning the probe tube .................................................................................................................................................. 68
13 On-Ear Measures Screen Setup ......................................................................................................................................... 70
On-ear single or dual view ................................................................................................................................................. 70
Graph, table or 2cc target format ....................................................................................................................................... 71
SPL or HL scale .................................................................................................................................................................. 71
Hide or show on-ear curves ................................................................................................................................................ 71
14 On-Ear Instrument Measures ............................................................................................................................................. 73
On-ear directional test overview ........................................................................................................................................ 73
On-ear directional testing ................................................................................................................................................... 73
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