vi FONIX FP35 Hearing Aid Analyzer
5.2.5 Placing the Sound Field Speaker ..............................................................116
5.2.6 Leveling the Sound Field Speaker .............................................................116
5.2.7 Testing Digital Aids ............................................................................118
5.2.8 Testing Body Aids..............................................................................11 8
5.3 Audiogram Entry Screen—Creating A Target ........................................................119
5.3.1 Entering the Audiogram Screen................................................................119
5.3.2 Audiogram Display ............................................................................119
5.3.3 Entering Audiometric Information & Creating A Target ........................................120
5.3.4 Creating an NAL-NL1 Target....................................................................120
5.3.5 Modifying a Target.............................................................................122
5.3.6 Measuring the Real-Ear to Coupler Difference.................................................122
5.3.6.1 Analyzer Setup for RECD...............................................................122
5.3.6.2 Client Setup for RECD ..................................................................123
5.3.6.3 Taking the RECD Measurement.........................................................124
5.3.7 Measuring the Real-Ear to Dial Difference .....................................................124
5.3.8 Measuring the Unaided measurement ........................................................127
5.3.9 Starting a New Client ..........................................................................129
5.3.10 Defining the Menu Items .....................................................................129
5.4 Insertion Gain Testing ...............................................................................131
5.4.1 Measuring the Unaided Response.............................................................133
5.4.2 Measuring the Aided Response ...............................................................134
5.4.3 Automatic Testing..............................................................................136
5.4.4 Testing Directional Hearing Aids...............................................................136
5.4.5 Testing Open Fit Hearing Aids .................................................................139
5.5 The Real-Ear SPL Screen ............................................................................140
5.5.1 The SPL Display ...............................................................................141
5.5.2 Running an SPL Test ...........................................................................141
5.5.3 Important Notes on SPL Testing ...............................................................143
5.5.3.1 Speech-Weighting Effects on Pure tones ...............................................143
5.5.3.2 Target Formulas .......................................................................143
5.5.4 Important Notes on DSL Testing ...............................................................144
5.6 Live Speech Testing .................................................................................145
5.6.1 Using Speech as a Test Signal..................................................................145
5.6.2 Measuring the occlusion effect.................................................................147
5.7 Miscellaneous Real-Ear Measurements..............................................................148
5.7.1 Measuring a Single Frequency Response ......................................................148
5.7.2 Measuring Harmonic Distortion................................................................148
5.7.3 Measuring Intermodulation Distortion.........................................................150
5.7.3.1 To perform a static IM distortion test ...................................................150
5.7.3.2 To perform an IM distortion sweep.....................................................151
5.7.3.3 To change the frequencies used in the sweep..........................................152
5.7.4 Using the Reference Microphone ..............................................................153
5.7.5 Viewing Target Data ............................................................................153
5.7.6 Measuring the Telecoil Response...............................................................154
5.8 Reference ...........................................................................................156
5.8.1 Viewing the Real-Ear Screens..................................................................156
5.8.2 Defining the Menu Items.......................................................................158
