Verifit
®
User's Guide Version 3.12
November 2015
ANSI test frequencies.........................................................................................................................................................41
Test box calibration facts...................................................................................................................................................41
Calibrating test box reference microphone........................................................................................................................42
Calibration check for coupler microphone........................................................................................................................43
Coupling the hearing instrument for ANSI tests...............................................................................................................44
Coupling the hearing instrument for Test box Speechmap...............................................................................................44
Positioning the hearing instrument....................................................................................................................................45
9 ANSI Hearing Aid Tests......................................................................................................................................................47
ANSI S3.22-1996 facts.......................................................................................................................................................47
ANSI S3.22-2003 facts.......................................................................................................................................................47
ANSI 1996 Linear and AGC tests......................................................................................................................................48
ANSI 2003 Linear and AGC tests......................................................................................................................................48
ANSI test results.................................................................................................................................................................49
ANSI input-output curves..................................................................................................................................................49
ANSI telecoil terminology.................................................................................................................................................50
ANSI telephone simulator (TMFS) test.............................................................................................................................51
ANSI test loop test..............................................................................................................................................................52
Telecoil test results.............................................................................................................................................................52
10 Other Test Box Measures..................................................................................................................................................54
Harmonic distortion............................................................................................................................................................54
Noise reduction...................................................................................................................................................................54
Feedback suppression test..................................................................................................................................................55
Directional function test.....................................................................................................................................................56
Directional ITE positioning................................................................................................................................................57
Directional BTE positioning..............................................................................................................................................57
Test box directional procedure...........................................................................................................................................58
Multicurve procedure.........................................................................................................................................................59
Multicurve results...............................................................................................................................................................59
Spectral analysis in Multicurve..........................................................................................................................................60
Battery drain test................................................................................................................................................................60
Manual control procedure..................................................................................................................................................61
Sound level meter using manual control...........................................................................................................................62
11 Sensory loss simulator.......................................................................................................................................................64
Sensory loss simulator description.....................................................................................................................................64
Sensory loss simulator operation.......................................................................................................................................64
12 On-Ear Measures - Setup...................................................................................................................................................65
External sound-field speaker setup....................................................................................................................................65
On-ear calibration facts......................................................................................................................................................65
Calibration of on-ear probe microphone............................................................................................................................66
Calibration check for probe module..................................................................................................................................67
Max TM SPL setup............................................................................................................................................................68
ABR nHL to eHL setup......................................................................................................................................................69
Positioning the client..........................................................................................................................................................69
Positioning the probe tube..................................................................................................................................................70
13 On-Ear Measures Screen Setup.........................................................................................................................................72
On-ear single or dual view.................................................................................................................................................72
Graph, table or 2cc target format.......................................................................................................................................73
SPL or HL scale..................................................................................................................................................................73
Hide or show on-ear curves................................................................................................................................................73
14 On-Ear Instrument Measures.............................................................................................................................................75
On-ear directional test overview........................................................................................................................................75
On-ear directional testing...................................................................................................................................................75
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