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FONIX FP35 Quick Reference Guide

Audiogram

Entry

Real-Ear SPL

Real Ear

Unaided & Aided

Insertion Gain

Figure 4.1.2—Real-ear navigation using next and back buttons

4.2  Real-Ear Setup

If you are using the FP35 as a portable unit, you can easily convert the internal 
sound chamber into a sound field speaker. If you are using the FP35 primarily in 
an office or clinical setting, you may wish to set up an external speaker for real-ear 
measurements.

4.2.1  General Setup

If not already in place, slide the Velcro mounting sleeves onto the reference 
microphone and probe microphone. 

When testing, the loudspeaker should be about 12 inches (30 cm) from the surface 
of the client’s head (near the temple) and pointing toward the ear to be tested. We 
recommend an azimuth angle of 45 degrees (halfway between the client’s nose and 
ear). The height of the loudspeaker should be level with, or a little above the ear. See 
Figure 4.2.1.

Top View

Speaker

(45 degrees)

12"

Reference Mic

Probe Mic

12"

Reference Mic

Probe Mic

Front View

Speaker

(45 degrees)

FONIX

 

FP35 Hearing Aid Analyzer

Figure 4.2.1—Real-ear measurement setup

Содержание FONIX FP35

Страница 1: ...Quick Reference Guide 2008 Frye Electronics Inc All rights reserved P N 010 0021 04 FONIX FP35 ...

Страница 2: ......

Страница 3: ...Test Sequences 15 3 1 The ANSI Sequence 15 3 1 1 Setting up for ANSI testing 15 3 1 2 Running an ANSI Test 16 3 1 3 Testing Digital Hearing Aids 18 3 2 IEC Testing 18 3 2 1 Setting Up the Hearing Aid for Testing 18 3 2 2 Running an IEC Test 19 Chapter 4 Real Ear Measurements 21 4 1 Introduction 21 4 1 1 Real Ear Screens 21 4 1 2 Navigation 21 4 2 Real Ear Setup 22 4 2 1 General Setup 22 4 2 2 Inte...

Страница 4: ...uring the Unaided Response 34 4 4 2 Measuring the Aided Response 35 4 4 3 Testing Automatically 36 4 4 4 Testing Directional Hearing Aids 36 4 5 Testing in the SPL Screen 39 4 5 1 Viewing the SPL Display 40 4 5 2 Running an SPL Test 40 4 5 3 Testing Automatically 41 4 6 Live Speech Testing 42 4 6 1 Using Speech as a Test Signal 42 4 6 2 Measuring the occlusion effect 43 Chapter 5 2 CC Targets 45 5...

Страница 5: ...al 1 1 Front Panel Layout Figure 1 1 Front panel The following is a short explanation of the basic functions of the keys on the FP35 front panel 1 Print Prints the current screen 2 Help Open the help window for the displayed screen 3 Reset Resets the analyzer deleting measurements and returning many set tings to their default selections 4 Operate Powers the analyzer on and off 5 Function keys F1 F...

Страница 6: ...e F3 will take you to one of the Coupler Multicurve screens and F2 will take you to one of the real ear screens The function of each key is displayed on the screen above the key The NEXT and BACK keys are used to take you to related screens For instance if you are in the Audiogram Entry screen pressing NEXT will take you to the Real ear SPL screen NEXT and BACK are also used for navigating through...

Страница 7: ...o the current screen For instance press ing MENU while in the ANSI 96 screen will open a local menu containing ANSI 96 selections See Figure 1 2 3 Advanced features and fine tuning selections are often hidden away in an advanced menu reachable using the NEXT and BACK keys Look at the title bar of the local menu to see if the NEXT and BACK keys are active in the dis played local menu ...

Страница 8: ...t clinicians in your office or for different types of hearing aid technology To save a setting configuration 1 Press MENU from the Opening screen This opens the Default Settings menu See Figure 1 3 2 Use F2 if desired to select the desired SETTINGS number you want to save your settings to Choose between SETTINGS 1 SETTINGS 2 and SETTINGS 3 3 Use the arrow keys to make any changes to the displayed ...

Страница 9: ... into the SETTINGS number displayed above F2 To switch to a different saved setting configuration Use F1 from the Opening screen to switch between SETTINGS 1 2 3 or Press MENU from the Opening screen to open the Default Settings menu Use F2 to switch between SETTINGS 1 2 and 3 Press EXIT to return to the Opening screen Figure 1 3 Default Settings Menu ...

Страница 10: ...nalyzer comes equipped with an internal thermal printer so that the ability to print a hard copy of your results is always available The thermal printer prints a clear easy to read image of the display You can also hook up an external printer to print your results on normal office paper You can use any external printer that supports HP PCL Hewlett Packard Printer Computer Language version 3 0 and ...

Страница 11: ...nce microphone 1 Enter the Coupler Multicurve screen by pressing F3 in the Opening screen 2 Open the sound chamber and place the coupler microphone at the center of the speaker cone in the sound chamber If the microphone cables are not positioned properly the chamber lid can pinch and eventually damage them Avoid damage by placing the cables between the arrows at the bottom of the speaker face The...

Страница 12: ...nfirm that you want to store the leveling 5 Press START STOP again to proceed 6 Press EXIT twice to return to the Opening Screen 2 2 Frequency Response Measurements The main purpose of the Coupler Multicurve screen is to perform frequency response measurements This section contains a short description of the signal types available in this screen and a basic explanation of how to perform fre quency...

Страница 13: ...ssing F3 in the Opening screen 2 Level the sound chamber if necessary as explained in Section 2 1 3 Attach the hearing aid to the coupler see the FP35 Operator s manual for details and place the assembly in the sound chamber 4 Close the sound chamber lid 5 Select the source type you want to use by pressing F4 You can either press F4 repeatedly until your desired source type appears on the screen a...

Страница 14: ...gnal Other aids will show no difference The Composite Digital Speech Option is required for this test 1 Follow the instructions in Section 2 2 2 to obtain a Digital Speech frequency response In step 5 make sure to choose DIG SPCH 2 Press F2 to select CRV 2 3 Use F4 to select COMP 4 Press START STOP to start the Composite measurement Leave the signal on for at least fifteen seconds giving the aid p...

Страница 15: ...ccur at 1000 Hz and 1500 Hz Definitions 2ND Harmonic Energy of the second harmonic or twice the presented fre quency 3RD Harmonic Energy of the third harmonic or three times the presented frequency TOTAL Combined 2ND and 3RD harmonic distortion See the FP35 Operator s manual for more details To perform a harmonic distor tion measurement 1 Enter the Coupler Multicurve curve screen by using F3 from ...

Страница 16: ...ly stop 10 Look at the bars at the bottom of the graph The scaling for these bars is on the right side of the graph This is the amount of harmonic distortion mea sured with the pure tone sweep See Figure 2 2 4 Figure 2 2 4 Harmonic distortion measurement 2 2 5 Testing Intermodulation Distortion Intermodulation IM distortion occurs when more than one frequency is pres ent in the source signal and t...

Страница 17: ...curve screen by pressing F3 from the Opening screen 3 Press MENU to enter the local menu 4 Use the 5 6 keys to select DISTORTION 5 Use 3 4 to select the type of IM distortion sweep you want to make Use TOTAL to get the most IM distortion data 6 Press NEXT to go to the Advanced Coupler Multicurve screen 7 Use the 5 6 keys to select IM FREQ DIFF 8 Use 3 4 to select the difference between the two ton...

Страница 18: ...14 FONIX FP35 Quick Reference Guide Figure 2 2 5 IM distortion measurement ...

Страница 19: ...and ANSI 03 first enter the ANSI test screen by using either F4 or F5 from the Opening screen select the function key labeled either ANSI 96 or ANSI 03 From the ANSI screen push MENU to open the local menu Use 5 6 to select ANSI TEST and 3 4 to switch between S3 22 1996 and S3 22 2003 After switching between the standards you must press MENU twice to update the local menu if you want to make any f...

Страница 20: ... I O Screen If you haven t yet run an ANSI test the I O curve selection box will show which curves you have selected to test 3 1 2 Running an ANSI Test 1 Press START STOP to begin the test 2 Usually the FP35 will pause during the measurement process in order to let you adjust the gain of the hearing aid to the reference test position a Lift the sound chamber lid and adjust the gain control of the ...

Страница 21: ...3 Automated Test Sequences 17 Figure 3 1 2A ANSI test completed Figure 3 1 2B ANSI 96 test I O Screen ...

Страница 22: ...urements in the coupler and in the real ear via the procedures described in Chapter 2 and Chapter 4 using the digital speech DIG SPCH signal source 3 2 IEC Testing The IEC 118 7 standard was designed by the International Electrotechnical Commission to assess hearing aids The performance part of that standard can be included as an automated sequence on your FP35 The F4 or F5 key in the Opening scre...

Страница 23: ...he hearing aid to the reference test position a Lift the sound chamber lid and adjust the gain control of the aid until the MEASURED gain matches TARGET gain b Close the sound chamber lid when finished c The MEASURED gain should be within 1 dB of the TARGET gain 4 Push START STOP to complete the test 5 Press NEXT to view the I O Screen 6 Press PRINT for a hard copy of the results Figure 3 2 2A IEC...

Страница 24: ...20 FONIX FP35 Quick Reference Guide Figure 3 2 2B IEC test results I O Screen ...

Страница 25: ...s and insertion gain curves Audiogram Entry Enter your audiograms choose your fitting rule perform RECD and REDD measurements and generate a target in this screen Real Ear SPL View thresholds UCLs targets and aided measurements in real ear SPL on one screen This gives you a complete picture of the client s hearing range and where the aided responses are falling in that range Real Ear Unaided Aided...

Страница 26: ...2 1 General Setup If not already in place slide the Velcro mounting sleeves onto the reference microphone and probe microphone When testing the loudspeaker should be about 12 inches 30 cm from the surface of the client s head near the temple and pointing toward the ear to be tested We recommend an azimuth angle of 45 degrees halfway between the client s nose and ear The height of the loudspeaker s...

Страница 27: ...g the speaker on the metal post Locate the metal post at the right side of the compartment Remove the post and place the wide end in the hole at the bottom right corner of the sound chamber Place the speaker on the tapered end of the post If the speaker does not reach your client s ear height you may want to add an optional extension pole that raises the speaker by an additional 6 5 inches 16 51 c...

Страница 28: ...rm is especially nice because you can move the speaker around the patient when you switch ears rather than move your patient around the speaker Figure 4 2 3 External sound field speaker setup To set up your FP35 software to use an external speaker 1 Press MENU from the Opening screen to enter the Default Settings menu 2 Press NEXT to enter the Advanced Default Settings menu 3 Select SPEAKER under ...

Страница 29: ...d on the wedge of the earhook directly above the ear to be tested 5 Attach the probe tube to the body of the probe microphone and then attach the probe microphone to the round Velcro pad on the ear hanger 6 Insert the probe tube into the client s ear so that the mark is at the location where the bottom of the outer surface of the earmold would be See Figure 4 2B Hints To help keep the probe tube i...

Страница 30: ...easurement screen or in the Audiogram Entry screen 2 Use 5 6 to select SOUND FIELD 3 Use 3 4 to select 0º or 45º 4 Press EXIT to return to the real ear screen Notes If you took your audiometric measurements with a sound field speaker it is recommended that you use the same azimuth for the real ear measurements as you used in the audiometric assessment The speaker position is set when the sound fie...

Страница 31: ...t the audiogram entry screen 7 Press START STOP The instrument will now attempt to level the sound field speaker These are the possible leveling status LEVELED 0º or LEVELED 45º The leveling process was correct within 2 dB The azimuth used is indicated UNLEVELED The leveling process was incorrect at least 6 dB You should check the speaker client and reference microphone position and try to level t...

Страница 32: ...t the last time you did a real ear measurement If necessary use the NEXT or BACK buttons to reach the Audiogram Entry Screen Figure 4 3 1 Audiogram Entry screen 4 3 2 Entering Audiometric Information Creating A Target Use the following instructions to create a non NAL NL1 target See Section 4 3 3 for NAL NL1 instructions The following step by step instructions assume that you are in the Audiogram ...

Страница 33: ... new ear if desired 4 3 3 Creating an NAL NL1 Target The NAL NL1 fitting rule is more adjustable and slightly more complicated than DSL and the traditional linear fitting rules In addition to the client s air conduction thresholds it takes into consideration the client s bone conduction thresholds whether the fitting is binaural or monaural the number of channels of the hearing aid and the type of...

Страница 34: ...shold values for the first ear will be displayed on the screen as a starting point for the entry of the new audiogram 13 Repeat Steps 4 8 to enter the audiogram for the new ear 4 3 4 Measuring the Real Ear to Coupler Difference The real ear to coupler difference RECD is the acoustical difference between the response of an insert earphone in the ear versus in a 2 cc coupler It involves two measurem...

Страница 35: ...ns found in Appendix C of the Operator s Manual for calibrating the insert earphones See Figure 4 3 4 1 10 Press F3 to select MEASURE RECD 11 Plug the insert earphone into the earphone jack in the back of the FP35 Figure 4 3 4 1 This screen indicates that the coupler part of the RECD needs to be taken 4 3 4 2 Client Setup for RECD This section describes how to set up the client for the real ear po...

Страница 36: ...have already generated a target curve see Section 4 3 2 and 4 3 3 and are ready to test The Unaided Aided Response screen and the Insertion Gain Screen are two parts of the same insertion gain method of fitting hearing aids The Unaided Aided Response Screen lets you measure and view aided gain measurements of the hearing aid See Figure 4 4A The Insertion Gain screen displays the insertion gain tar...

Страница 37: ...4 Real Ear Measurements 33 Figure 4 4A Real Ear Aided Unaided screen Figure 4 4B Real Ear Insertion Gain screen ...

Страница 38: ...ess F2 to select CUSTOM UNAIDED If AVG UNAIDED appears press MENU and use the arrow keys to change the UNAIDED selection to CUSTOM Press EXIT to close the local menu 4 Use the 5 6 keys to adjust the source amplitude to 65 or 70 dB SPL 5 Have the client sit still in the same position they were in during leveling and press START STOP to begin measuring the unaided response If you are using the compo...

Страница 39: ...should be at the same position it was for the unaided test See Figure 4 2 4C 2 Have the client set the aid s gain control to the normal use level 3 Press F4 to select the source type DIG SPCH is recommended if you have the Composite Digital Speech Option Otherwise use FAST 4 Use the 5 6 buttons to adjust the source amplitude to the desired level usually the same level used for the unaided measurem...

Страница 40: ...creen 2 Use to select AUTO TEST and set it to ON 3 Press EXIT to close the menu 4 Press START STOP The analyzer will automatically test AIDED 1 AIDED 2 and AIDED 3 The Auto Test feature can be defaulted to on See Section 1 3 for details 4 4 4 Testing Directional Hearing Aids The Insertion Gain screen is a good place to perform a directionality test for directional hearing aids In an insertion gain...

Страница 41: ...Press START STOP to take the measurement If you re using a FAST COMP or DIG SPCH signal press START STOP again to stop the signal once the measurement has stabilized This curve will be the forward measurement 10 Turn your client around so that the back of his head is facing the speaker See Figure 4 4 4A Alternately if you are using an external speaker on a swing arm you can swing the speaker aroun...

Страница 42: ...38 FONIX FP35 Quick Reference Guide Figure 4 4 4A Reverse directional aid setup Figure 4 4 4B Forward and reverse directional aid measurements in the real ear unaided unaided screen ...

Страница 43: ...ses in SPL at three different source amplitude levels Having all this information in a common format provides a convenient way to view the hearing loss and the amplification provided by the hearing aid without the confusion of different frames of reference The factory default amplitudes used in this program are generally 50 65 and 90 dB When DSL is the selected fitting rule these default levels wi...

Страница 44: ...otes the uncomfortable levels Figure 4 5 1 SPL display 4 5 2 Running an SPL Test This section assumes you have already entered the client s audiometric data in the Audiogram Entry Screen and that you have generated a target See Section 4 3 3 and 4 3 4 for more details 1 Place the probe tube into the client s ear following the instructions provided in Section 4 2 4 2 Insert the aid into the client ...

Страница 45: ...B SPL to make sure soft sounds are above the patient s threshold values AIDED 2 is tested at medium levels 65 70 dB SPL to make sure that the aid meets the target AIDED 3 is tested at loud levels 90 dB SPL to make sure that loud sounds are beneath the patient s UCLs Figure 4 5 2 Real Ear SPL screen with measurements 4 5 3 Testing Automatically The FP35 analyzer has the capability of performing aut...

Страница 46: ...orld environment It is especially useful if you have the spouse or family member of the client in the testing room and can use his her voice as the test signal This makes a great counseling tool for both the client and his family member in showing them how close they need to be to each other in order for the hearing aid to work effectively The live speech measurement can be taken in any measuremen...

Страница 47: ...rement 5 Instruct your patient s spouse to stand 3 feet away 1 meter and speak again 6 Press START STOP to stop the measurement Show your patient and his spouse how the distance improved the gain of the frequency response 7 Experiment in this manner with different distances This will help demonstrate how close your patient and his spouse need to be to each other to maximum speech intelligibility F...

Страница 48: ...es when the measurements are performed Press EXIT to close the local menu To measure the ocxclusion effect 1 Press START STOP to start the measurement 2 Instruct your client to sustain the vowel sound eee 3 Press START STOP while the eee is still sounding and the curve has stabilized The patient can now stop vocalizing 4 Look at the gain in the low frequencies If it seems high you may consider adj...

Страница 49: ...SPL or dB GAIN In the Coupler EarSim screen the opposite approach is used and actual real ear targets are displayed When coupler measurements are taken the response curves are converted using average or measured RECD transforms into simulated real ear measurements which can then be directly compared to the displayed real ear targets Two displays are available Insertion Gain and SPL When the SPL di...

Страница 50: ...will also have to set COMPRESSION CHANNELS AID LIMITING FIT TYPE TUBING and VENT See Section 4 3 3 for details 7 Press EXIT to return to the measurement screen You are now ready to perform the coupler measurements 5 2 Coupler Target Press NEXT from the Coupler Multicurve screen or BACK from the Coupler EarSim screen to enter the Coupler Target screen In the Coupler Target screen the real ear targe...

Страница 51: ...l ear to coupler target conversions measure the patient s unaided response in one of the real ear measurement screens Section 4 4 1 The measured REUR will be used to convert the coupler measurements into simulated real ear measurements See Section 4 4 1 for instructions on performing the REUR measurement In the SPL display Figure 5 3 the patient s audiometric data HTL and UCL values are converted ...

Страница 52: ...de Figure 5 3 Coupler EarSim screen See Section 2 2 for instructions on how to perform measurements in the Coupler EarSim screen the operation of the Coupler EarSim screen is identical to the operation of the Coupler Multicurve screen ...

Страница 53: ... Entry 21 Audiogram Entry Screen 27 Auto Test 36 41 B Back 2 C COMPOSITE 9 Coupler EarSim 47 Coupler Multicurve 7 Coupler Target 46 D default selections 4 digital aid 10 Digital Hearing Aids 18 Directional Hearing Aids 36 DSL 29 DSP SPCH 9 E Exit 2 external printer 6 External Speaker 24 F FAST 8 frequency response mea surements 8 front panel 1 Function keys 1 2 H Harmonic distortion 11 Help 1 2 S ...

Страница 54: ......

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