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Frye FP40D Hearing Aid User Manual

1. Wedge Style Ear Hook Optional Swing Arm Speaker Standard size and Cable Holds probe and reference microphones Allows precise placement and aiming during real ear testing Improved design of the loudspeaker eliminates need for Velcro headband Monitor Headset folding Infant Child Headband Package Optional with FP40 D Includes infant child and adult head bands six flexible earhooks and two sets of animal ears Other Real Ear Accessories Set of 25 Probe Tubes Ear hook standard size Ear Hook children s size Velcro Headband Calibration Clip Felt Pen dry erase Probe Calibration Adapter Introduction 9 1 5 Layout amp Controls This section gives a short explanation of the layout of the FP40 analyzer its controls and its func tions 1 5 1 LCD Liquid Crystal Display The FP40 is equipped with an LCD screen that displays test results and operational instructions in both alphanumeric and graphical formats This display is mounted on a swing up door that can be adjusted for optimum viewing by the operator Hint If no display appears on the LCD screen turn the contrast knob in the upper right corner or press any key E Ss F1 F2 F3 F4 F5 F6 F7 F8 F9 CONTRAST LINE POWER O RESET DATA PRINT OPERATE START GRAPH LEVEE A
2. 4 5 7 Coupler prescription non DSL 44a eb ORE Rl CER ADDE RC RC 5 7 1 Viewing the Target 2 66 Screens Vues gw RR RR t A RR CC OR RES 5 7 2 Taking the FOG measurement 4 4 i402 cag he ER ER SERRE ER ERAS 5 7 3 Viewing the SSPL 90 street in ases n vae E EXER S EI 5 7 4 Taking the SSPL 90 measurement 0 e eee eee eee eee 5 7 5 Checking an aid against a prescription 0 eee eee eee 5 7 6 Accounting for venting effects d v ed aav ee MER EG Sethian 5 7 7 Understanding the technical details llle 5 8 MISCELLANEOUS 24 2 getreten so ettet eod d en scandal Dr Rode e ees cele er 107 5 8 1 Single frequency response ck HR A Oe e OC V oe ee RC URN 107 h 9 2 STHODEIIE eG cae aas Wie a RHEINE UR OR eed eoe OR SRS 107 5 8 3 Reset Devel nsu dh eo dessin git AG ee RES RES te nad ae 108 58 4 Data Display S oa avete uer ek ee ee ER eO ERR eq E RR d adn 108 5 9 Body CROS and BI CROS aids i4 ioa ye x eor ex C ICA Hd C dee on s 109 5 9 1 Testing Body Aids de doe eds A3 NER CER D VR de dare f 109 5 9 2 Testing CROS and BICROS aids a 554A tpe 4 ex E EAE ee eee XA 110 59 2 1 Head bBatfle Effect iE Rs RAs dee bah X RES 110 5 9 2 2 How Well the Aid Overcomes the Head Baffle Effect 111 5 9 2 3 Overall Insertion Gain lee ah 112 5 9 2 4 Insertion Loss to the Good Ear CROS eese 113 5 10 FM Systems i iced eae eee yh RR ERE CERE rns E eR a a de is 114 5 11 Testi
3. The analyzer will pause again if you are performing a telecoil measurement and instruct you to put the aid in telecoil mode Do so Otherwise wait for the test sequence to finish Plug the Telewand into the External Speaker jack on the back of the FP40 and hold the wand over the aid as you would hold a telephone receiver to your ear That is for BTE aids hold the wand flat against the body of the aid For ITE ITC CIC aids hold the wand against the faceplate of the aid Press START STOP to take the telecoil measurements Put the aid back into microphone mode when the analyzer instructs you to Unplug the telewand from the External Speaker jack on the back of the FP40 Press START STOP to complete the test sequence Automated Test Sequences 61 4 2 4 Viewing the results See Figure 4 2 4 for an example of an ANSI 96 test sequence including the telecoil measurement SO gos st CONS SUE c vesc d eee 12 13 14 15 16 DUTPUT i AWS 53 22 96 OUTPUT SPL cs z SPL OSPL90 Output measurement at 90 dB SPL RESP50 or 60 Response measurement at 50 or 60 db SPL at reference test gain SPLITS Telecoil response curve measurement NR Noise reduction used in tests SPA HFA Frequencies used for the three frequency average MAX Maximum frequency response measured and the frequency at which it occurred SPA HFA OSPL90 Three frequency average of the OSPL90 curve SPA HFA FOG Three frequency average of a full on
4. 1 122 Set up the hearing aid in the usual way by connecting it to the correct coupler and insert the test microphone You may use either a normal hearing aid battery or a battery substitution pill to power the aid Plug the Telewand into the external speaker jack on the back of the FP40 hearing aid analyzer Press F1 MENU from the Main Coupler screen in order to enter the Setup Menu FONIX FP40 Portable Hearing Aid Analyzer 4 Use the AMPLITUDE and FREQUENCY knobs to select MAIN F2 under FUNCTION KEY DEFIN Press START STOP repeatedly to select TELECOIL Press F1 to return to the Main Coupler screen Press F2 to turn ON the telecoil feature onary Hold the Telewand next to the hearing aid as if you were holding a telephone next to the aid in the patient s ear That is if the aid is a BTE hold the Telewand parallel to the aid s body See Figure 7 2 If the aid is an ITE hold the Telewand against the aid s faceplate Figure 7 2 Using the Telewand 7 3 Environmental Magnetic Fields Telecoil testing can be difficult in the presence of magnetic fields If you normally use an external monitor with your FP40 analyzer turn it off for this test and use the LCD only Check for the pres ence of unwanted magnetic fields by using a wide range linear hearing aid on the T setting and with the volume control full on Attach the aid to a coupler without the test microphone Listen through the coupler In some loc
5. 0 0 cece ee eee eee eee eee 28 2 0 PHDNUNG bx whee aneee unas ie AGI a Qe a MOM E E GIA 29 2 9 1 Selecting the PHN vers s en oO Ceca Ree xo ot e m Ree 29 2 9 2 Using the thermal printer eoe ded ieee eeu nes te SECO S A oer th 29 2 9 3 Using an external pHBEGEA x oua 23 Gide da edet ene Pi tue t eS OM 30 20 Printing adabels s so eure dove Se xe re ERU CR E Ede b dete RSs 31 2 10 The Opening Screen is Coke A V e oe ROM dp ACROSS o S AO REA ON 32 2 11 The Battery Option not available on FP40 D 0 0000 eae 32 Chapter 3 Coupler Measurements 3 1 3 2 3 3 3 4 The Main Coupler Screen syaa mirin pane Ea Ce tae e C Ru UN CS Ur 35 3 1 1 Viewing a Pure tode display cos eoa ER xke e we s y e 35 3 1 2 Viewing a Composite dispIay u s anes dex ka x RR EN Me d kon 36 leveling eres Qc eR Oe WR ERR ROO CIE TCR adc CATS Ra a e dur dt 36 3 2 1 Leveling without the reference microphone standard 37 3 2 2 Leveling with the reference microphone 2 ee eee eeee 37 3 2 3 Saving the leveling information 3 uos a oto RR V qe PS sra 38 Hearne Aid Seu 4 pas vet a t a ecu o qa rur aeu Ra EE ed P cel es 38 3 3 Setting up a BTE ossi ox RII um yn RICE Pala 39 3 3 2 Setting up an ITE ITG GIG 2i bee hp uev RE nt n be 39 9 2 2 Setting up a body did ig oup awake we Pe WGA EE OCEAN ona 41 3 3 4 Setting up an eyeglass aid saei eda e e VERE vd E WR RO 41 Frequency responses con o kal ee Re Es RTE VG A eed we
6. 1 2 3 4 10 11 12 13 14 Prepare the sound source Press F5 from the Main Coupler screen to enter the Probe Mode Press F4 to enter the Target screen Follow the instructions from Section 5 2 2 to input the patient s thresholds You can also input the patient s measured UCL values or predict them by pressing F5 Pressing F5 will also gen erate a real ear target Press F4 to return to the Probe Mode Press F2 to select SPL You should see a graph with the patient s thresholds uncomfortable levels and real ear target all in dB SPL Press F7 to select a source type of COMPOSITE Use the AMPLITUDE knob to turn the source signal all the way OFE This will put the ana lyzer in Spectrum Analysis Mode Place the probe tube as close as possible to the eardrum Marking the probe tube depth at 25 30 mm should accomplish this is an average adult ear canal Position client 12 from speaker at a 45 degree angle Place the aid in the ear Turn it on to use gain Press F3 to select AIDED 1 Turn on the external sound source Press START STOP to begin spectrum analysis Then press START STOP again to freeze the measurement Turn off the external sound source You can repeat this for AIDED 2 and AIDED 3 Note The real ear target depends on the source level of AIDED 2 If you turn the source of AIDED 2 all the way off to put the analyzer in Spectrum Analysis Mode you will no longer be able to see a real ear tar
7. Display type dB GAIN or dB SPL Signal type Composite weighting Amount of noise reduction used see Section 2 4 1 2 Status of reference microphone Leveling status Source level of signal RMS out measured by analyzer of current graph SOs igo ek OY Out che open qos ck Battery current drain only if turned on 3 2 Leveling Leveling is the process by which the response of the sound chamber is measured and computer cor rected so that a flat sound field is achieved The leveling status can be saved into the FP40 analyz er s permanent memory so you don t have to level the analyzer every time you turn it on However if you get your analyzer calibrated or if you get a software upgrade you should always level the chamber again and save the leveling If you are getting bad coupler frequency responses that you suspect are the fault of the analyzer rather than the fault of the hearing aid the first step of troubleshooting is to level the sound cham ber Even if the screen says LEVELED the response of the measurement microphone may have 36 FONIX FP40 Portable Hearing Aid Analyzer altered since the analyzer was last leveled invalidating the leveling When in doubt level the sound chamber again 3 2 1 Leveling without the reference microphone standard The leveling process described here is adequate for most testing situations If you have the Probe Option you can also level the sound chamber using the reference probe
8. General Operation 23 Digital Speech ANSI uses the same speech spectrum as the Composite signal This speech spectrum taken from the ANSI S3 42 standard rolls off the high frequencies starting with 3 dB down at 900 Hz and continuing at a rate of 9 dB per octave Digital Speech ICRA uses the ICRA speech spectrum developed by the International Collegium of Rehabilitative Audiology The ICRA spectrum is based on the Long Term Average Speech Spectrum LTASS and rolls off the high frequencies more rapidly than the ANSI spectrum Figure 2 4 2 1 shows a comparison of the spectra OUTPUT SPL dB a Aa a DIGITAL SPEECH 7e xd y mM M D M MC ER M M lem WEIGHT POUR XE i REFERENCE MIC OF IRSE E D La 7 7 iP o LEVELED i iRMS SOURCE 80 dBi SB o osos s sos RMS OUT 88 2 dB a ug 1 kHz 2 Figure 2 4 2 1 Comparison of Digital Speech ICRA CRV 1 and Digital Speech ANSI CRV 2 2 4 2 2 Noise Reduction There is only one setting for the composite signals in the General Setup Menu NOISE RED Composite noise reduction is a little different than pure tone noise reduction even though both are used for noisy testing environments When a composite signal is running the analyzer takes several different measurements a second displays them on the screen Composite noise reduction performs a running average of these com posite measurements This means it averages together several of the previous measurements
9. Our e mail address is service frye com and our web site is http www frye com Units may be returned to Frye Electronics Inc 9826 S W Tigard St Tigard Oregon 97223 It is advisable to contact the company or your local Frye representative first since many problems can be fixed without returning the whole unit Printed circuit boards for instance may be exchanged If something must be returned an RMA number will be issued When contacting the factory please have the serial number of your instrument on hand Found on the rear panel of the instrument It will also be helpful for you to be able to tell us the software version installed on your machine The software version and date of release are found on the LCD when you turn the unit on FP40 D or press OPERATE FP40 1 7 2 Cleaning the FP40 Display Cleaning of the FP40 LCD screen should be kept to a minimum to avoid scratching the surface To clean the LCD first blow off any loose dust Then wipe gently with a soft cloth moistened with glass cleaner The surface of the LCD is waxed to minimize scratching Introduction LES 1 7 3 Emergency Shutdown If you find it impossible to turn off the instrument using the OPERATE button in units with a Battery Option hold OPERATE down and then tap RESET twice Or you can simply hold the OPERATE button down for five seconds 1 7 4 Warranty The FONIX FP40 FP40 D and its accessories are guaranteed to be free from manufacturing def
10. Real Ear Measurements TARGET COUPLER RECD FREQ RECD EAR LEFT i i dB MEASURED AVERAGE I kHz 2 8 Figure 5 6 1 2B Measured RECD 5 6 2 Performing coupler measurements to a DSL target 100 1 10 Enter your client s thresholds and generate a target as described in Section 5 2 Make sure to input your client s age before generating the target Enter the Target 2 cc screen by pressing F7 Decide whether you want to use the average RECD data to create the 2 cc target or the cli ent s measured RECD To measure the client s RECD follow the instructions found in Section 5 6 1 Make sure to unplug the insert earphone from the analyzer when done Check and make sure that the RESER is set to zero This is at the bottom of the table in the middle of the screen Press F6 to select desired amplitude of test signal The source type is shown on the screen The source used is always the last source type you used in the normal Probe screen Press F4 to choose the aid type Notice the comparison ratios CR displayed in the chart to the right of the target graph DSL WDRC only DSL authorities recommend fitting the aid at the average of the calculated ratios If there are large differences between the recommended ratios below 1500 Hz as com pared to those above 1500 Hz a dual channel aid would be preferable Press START STOP to start measurement If the signal type is composite or Digital Sp
11. Screen labels 19 Servicing 15 Setup 14 38 73 77 79 81 82 85 86 87 88 91 96 103 109 client 76 earhook 77 reference microphone 77 sound field speaker 76 FONIX FP40 Portable Hearing Aid Analyzer Shutdown 16 Single frequency response 44 107 Smoothing 107 Sound chamber 7 Sound level calibrator 6 Source type 21 42 Speaker swing arm 9 Specifications 125 Spectrum Mode 117 SPL measurements 90 92 SPL Mode 145 SPL Screen 92 SSPL 90 Screen 103 Storage compartments 141 Index T Target 2 cc 102 FOG 103 Target Screen 80 Telecoil external 7 121 Telecoil Option 1 Telewand 8 122 Three frequency average 45 Troubleshooting 143 U Unaided response 86 V VGA 3 12 VGA Option 1 Ww Warranty 16 155
12. microphone That meth od is described in Section 3 2 2 1 Look in the Coupler Status Box Make sure it says REFERENCE MIC OFE If the reference microphone is ON turn it off in the General Setup Menu 2 Open the sound chamber 3 Place the measurement microphone at the center of the speaker cone in the sound chamber See Figure 3 2 1 Figure 3 2 1 Leveling without the reference microphone 4 Close the chamber lid 5 Press LEVEL 6 Press START STOP To save the leveling information so it will be used the next time you turn on the analyzer go to Section 3 2 3 3 2 2 Leveling with the reference microphone If your unit has the Probe Option you can use the probe microphone as a reference microphone in leveling This method is more exact than the leveling method described in Section 3 2 1 but you must level the chamber every time you change the hearing aid Coupler Measurements 37 1 Set up the aid for testing as described in Section 3 3 If you are using a battery pill for test ing don t plug it in yet If you are using a regular battery for testing do not turn on the hear ing aid 2 Insert the measurement microphone into the coupler 3 Place the reference probe microphone next to the measurement microphone Use some Fun Tak to secure the probe tube next to the microphone of the hearing aid See Figure 3 2 2 4 Press F1 from a coupler measurement screen 5 Use the AMPLITUDE and FREQUENCY knobs to
13. 3 Running the test sequence vule Ex dor AC ORARE RNC UCR ROC RE S 4 5 4 Viewing the Tesults iva oios ea ee PERE AK Pic pre SUPR A Meade PERS 07 Profiler uo dE auk Veo Ca o b Sec aen cR p OR as VR DENEN oe MR URS e UR a UR 4 6 1 Setting up for the test sees Ace RR PEE E ERE X KR E E ROE de iA 4 6 2 Running the test sequence ye ced ese a e a EY eU e AK 4 6 3 Viewing the results oc bs sevo at prep P Spe obra San Die ede edel Solia Sn dopo AAT ACIG ud rsdueneiu duces euge que ce eu iiber ee dure NET E ES MEER S Chapter 5 Real Ear Measurements 5 1 Preparation for Real Ear Measurements 0 00 cece eee eee eee eens 5 1 1 Setting up the analyzer for testing 0 2 eee eee eee 5 1 1 1 To set up the microphones and monitor headset l l 5 1 1 2 To set up the internal sound field speaker 00 00 e eae 5 1 1 3 To set up an external sound field speaker 020000 5 1 2 Setting up the client for testing uas deor rhe Y ee RR EAT Hee 5 1 2 1 To position the sound field speaker 0 0 e ee eee ees 5 1 2 2 To place the earhook and reference microphone 06 5 1 2 3 To insert the probe tube M vive NR EXE RE rae aua 5 1 2 4 To level the sound field s eioe hint bok am date HS VASA AERA 5 2 The Target Sereen ire ae er re UR P ER o ed ebd e e p pubes 5 2 1 Viewing the target sereeni so oboe ee eee ee Ra EUN 5 2 2 Greating a tareetz zu oou cu ee av eda USE eR IE E
14. 8 5 7600 5 1 1700 8 1 3700 14 3 5700 8 3 7700 4 8 1800 9 3 3800 13 9 5800 8 2 7800 4 6 1900 10 9 3900 13 5 5900 8 0 7900 4 4 2000 12 6 4000 13 1 6000 7 8 8000 4 2 TABLE 2 Speech Weighting FREQ FREQ FREQ FREQ Hz dB Hz dB Hz dB Hz dB 2100 8 1 4100 13 4 6100 16 7 200 0 2 2200 8 4 4200 13 6 6200 16 9 300 0 5 2300 8 8 4300 13 8 6300 17 0 400 0 8 2400 9 1 4400 14 0 6400 17 1 500 1 2 2500 9 4 4500 14 1 6500 17 3 600 1 6 2600 9 7 4600 14 3 6600 17 4 700 2 1 2700 10 0 4700 14 5 6700 17 5 800 2 5 2800 10 3 4800 14 7 6800 17 6 900 3 0 2900 10 6 4900 14 9 6900 17 8 1000 3 5 3000 10 8 5000 15 0 7000 17 9 1100 4 0 3100 11 1 5100 15 2 7100 18 0 1200 4 4 3200 11 3 5200 15 4 7200 18 1 1300 4 9 3300 11 6 5300 15 5 7300 18 2 1400 5 8 3400 11 8 5400 15 7 7400 18 4 1500 5 8 3500 12 1 5500 15 8 7500 18 5 1600 6 2 3600 12 3 5600 16 0 7600 18 6 1700 6 6 3700 12 5 5700 16 1 7700 18 7 1800 7 0 3800 12 7 5800 16 3 7800 18 8 1900 7 4 3900 13 0 5900 16 4 7900 18 9 2000 7 7 4000 13 2 6000 16 6 8000 19 0 146 FONIX FP40 Portable Hearing Aid Analyzer TABLE 3 HL to real ear SPL conversion table from ANSI S3 6 1989 Table G 1 FREQ Hz dB 250 19 0 500 12 0 750 10 5 1000 9 0 1500 12 0 2000 15 0 3000 15 5 4000 13 0 6000 13 0 8000 14 0 TABLE 4 HTL HL to UCL HL prediction table from Pascoe 1988 Table 4 This table is only used when the age is not specified in the Target Screen For age specific conversion values contact
15. Figure 3 8B for a comparison of an aid tested with an HA 2 coupler and the same aid tested with an MZ 3 coupler and OES correction factors Coupler Measurements 53 TYPE OF AID COUPLER COMMENT ITE ITC MZ 1 BTE or MZ 1 With custom earmold attached NOTE Vents must be plugged EYEGLASS MZ 2 Without custom earmold attached when a 3 mm horn earmold is planned use with the Ear Level Hearing Aid Adapter that normally snaps onto the HA 2 2cc coupler Without custom earmold attached when a conventional 13 tub ing earmold is planned attach a length of 13 tubing that corre sponds to the length of the sound channel of the wearer s earmold With snap on receivers use the MZ 2 without the Ear Level Hearing Aid Adapter attaced Figure 3 8A Choosing the proper MZ coupler DIGITAL SPEECH ANSI WEIGHT GAIN GAIN 78 iNOIS B i REFERENCE MIC OFI AGAIN 70 dB f LEVELED ERMS SOURCE 78 d RMS OUT 99 5 di Figure 3 8B MZ 3 vs HA 2 comparison 54 FONIX FP40 Portable Hearing Aid Analyzer Chapter 4 Automated Test Sequences There are several different automated test sequences available on the FP40 analyzer e ANSI 3 22 2003 e JIS e ANSI S3 22 1996 SI ANSI S3 22 1987 Profiler e ANSI S3 42 1992 EC ACIC The ANSI S3 22 is the FDA s hearing aid labeling standard All hearing aids manufactured in the United States are labeled to this standard ANSI 03 ANSI 96 and ANSI 87 are th
16. HRL 2 SOURCE DIGSP ANSI 68 dB 8 RECD MERSURED AGE 2 3 VERRS O MEASURED ARGET T FONIX FP40 Portable Hearing Aid Analyzer 5 7 2 Taking the FOG measurement 1 2 3 Follow the instructions found in Section 5 2 to generate a real ear target Press F7 to enter the Target 2 cc screen Use F2 to select whether or not you want to use the KEMAR average unaided response to generate the 2 cc target or the client s measured unaided response To measure the client s unaided response follow the instructions found in Section 5 3 2 Decide whether you want to use the average RECD data to create the 2 cc targets or the cli ent s measured RECD To measure the client s RECD follow the instructions found in Section 5 6 1 Use F4 to select the aid type Adjust reserve gain by turning the FREQUENCY knob clockwise until cursor reaches the bot tom of the Target Coupler box in the middle of the display Use the AMPLITUDE knob to change the amount of reserve gain Use the FREQUENCY and AMPLITUDE knobs to modify the 2 cc target if desired See Section 5 7 6 for some suggested vent corrections Use F6 to select the source level Place the hearing aid in the chamber and measure the response by pushing START The ana lyzer will use the source type last used in the Probe screen Other functions amp Notes Press F8 to clear any modifications made to the target with the AMPLITUDE and FREQUENCY k
17. INT DENSITY 5 iSWEEP TYPE NORMAL FUNCT ION KEY DEF IN MBIM F2 FMA i MB MULT ICRU GAIN IH IN ANS6 iSETUP F2 iSETUP F3 Figure 3 4 1 Selecting a pure tone sweep To select a Composite Digital Speech source 1 2 3 Press FI MENU to enter the General Setup Menu Select SOURCE with the FREQUENCY and AMPLITUDE knobs Press START STOP to cycle through your choices To select the Composite signal choose COMPOSITE If you have the Digital Speech Option you will also have access to DIGSP ANSI Digital Speech ANSI and DIGSP ICRA Digital Speech ICRA Press F1 EXIT to return to the Main Coupler Screen 3 4 2 Taking the measurement T Make sure the sound chamber is leveled as described in Section 3 2 You don t need to level the sound chamber every time you turn it on but it s a good idea to level the chamber and save the leveling about once a week Set up the hearing aid in the sound chamber as described in Section 3 3 Choose a source type as described in Section 3 4 1 Adjust the source to the desired level by using the AMPLITUDE knob If you are using a composite digital speech signal you will see the RMS SOURCE in the STATUS box change as you adjust the knob If you are using a pure tone signal you will see the SOURCE change in the lower right hand corner of the screen Press START STOP This will start the measurement If you are using a NORM or SHORT pure tone source sign
18. OUTPUT Figure 4 6 3 Profiler results 4 7 ACIC The ACIC test sequence is the ANSI 87 test sequence with CIC correction factors Follow the instruc tions in Section 4 3 to run the ACIC test sequence Make sure to use a CIC coupler The ACIC test sequence is for informational puproses only It cannot be used for comparison to manufacturer s specifications which assume a 2 cc coupler 72 FONIX FP40 Portable Hearing Aid Analyzer Chapter 5 Real Ear Measurements The Probe Option of the FONIX FP40 allows you to test hearing aids in the client s ear also known as real ear measurements There are three real ear measurement screens Insertion Gain SPL and Audibility Index Each display presents different format from which to evaluate your hear ing aid fitting There is also a Target 2 cc coupler screen that lets you take coupler measurements and compare them to appropriate targets The available test stimuli include pure tone sweeps the Composite signal the Digital Speech signals and live speech in spectrum analysis mode To take real ear measurements the FP40 s build in sound chamber converts easily to a sound field speaker The larger microphone of the M200 dual microphone set used as the measurement micro phone in coupler measurements turns into a reference microphone for real ear measurements The smaller microphone of the dual microphone set used as a reference microphone when taking cou pler measurements turns
19. Output AIDED 2 should be less than AIDED 1 Note You could also measure the effects with the hearing aid turned on OUTPUT 1 kHz gt 2 Figure 10 3 APPLICATION 2 INSERTION GAIN MEASUREMENTS USING AN EXTERNAL SOUND SOURCE For this procedure the choice of sound source is yours You may want to use a tape or CD player through a loudspeaker Any sustained sound source will work Whether you use a cocktail noise tape or one of the new environment CDs you should find your test results interesting especially when testing nonlinear signal processing hearing aids Suggested Procedure 1 Prepare your sound source 2 Press F5 from the Main Coupler screen to enter the Probe Mode 3 Use F2 to select IG 4 Use F7 to select a source type of COMPOSITE 5 Use the AMPLITUDE knob to turn the source all the way OFE This puts the analyzer in Spectrum Analysis Mode 6 Perform a typical UNAIDED and AIDED real ear test except use your external sound source instead of the composite signal 118 FONIX FP40 Portable Hearing Aid Analyzer APPLICATION 3 REAL EAR AIDED RESPONSE REAR IN SPL USING AN EXTERNAL SOUND SOURCE This application is similar to the Insertion Gain test described in Application 2 But instead of mea suring real ear gain you will measure the SPL generated in the ear canal and compare it to the patient s HTL and UCL values This is sometimes known as a Visible Speech Suggested Procedure
20. REFERENCE MIC OFF iDISPLAY LIGHT INOISE REDUC iRESET LEVEL _7 dB iDISPLEV MODE LCD SETTL TIME 5 mS BATTERY DISP ON MENU TYPE FULL RUG FREGS HEA 2000 BATTERY 13 ZINC RIR PEINT oll DE WES DER e iE i i REFERENCE MIC ON FUNCTION KEV DEFIM COMPOSITE SETTINGS EEROOIMING oe MAIN F2 MULTICRU iDUTPUT LIMIT 128dB iMAIN F3 iNDISE REDUC 4X iTEST TYPE SPL eue E3 NPB DATA DISPLAY AIDED SETUP F3 iF DEFINITION SOURC SEL Figure 2 2 General Setup Menu General Operation 17 2 2 1 Making selections Notice the three columns in the General Setup Menu Move the selection indicator lines above and below the selection from one column to another using the FREQUENCY knob Move the knob slowly You will feel each position change Move the selection indicator up and down within the col umns with the AMPLITUDE knob Push the START STOP button found in the very center of the front panel to switch between the available choices at the indicated position 2 2 2 Saving changes Unless you purposely make setup changes permanent they will only be effective until you turn off the analyzer When the analyzer is turned on again it will revert to default settings However you can change the default settings to suit your own needs To change the default setting of an individual item highlight the item in the General Setup Menu change it to the desired setting and press F8 This
21. WDRC or DSL LIN when generating the target In order to perform DSL coupler measurements including real ear to coupler difference RECD measurements follow the instructions found in Section 5 6 When DSL is the selected fitting method the FP40 makes several accommodations in the real ear and target screens These accommodations happen automatically so you don t really have to worry about them but it s useful to know what s going on When DSL is selected The Composite signal is weighted using the adult or child long term average speech spectrum LTASS instead of the normal ANSI weighting Keep this in mind if comparing real ear DSL measurements to measurements made with a different type of target The Digital Speech signal is weighted using the adult or child LTASS instead of ANSI or ICRA speech weighting The Digital Speech source selection is denoted as DIGSP LTASS to reflect its speech weighting A speech banana appears on the real ear SPL screen along with the target HTL and UCL data This speech banana disappears when a measurement is taken in order to cut down on the number of lines on the screen at the same time There is a CT compression threshold selection in the target screen with DSL WDRC is the selected fitting rule This does not apply for DSL LIN There are no corresponding insertion gain targets since DSL is not meant to be viewed in terms of insertion gain There is no way to edit a real ear DSL
22. aids RECD Earphone Package Consists of one ER3A earphone with a phono plug a 72 inch cable an assort ment of ear tips a calibration certifi cate and a lapel clip This package is suitable for performing an RECD mea surement with the FP40 analyzer External Telecoil For checking the response of aids in the telephone mode CIC Coupler Required coupler for use with CIC Option Er 5 Battery Pill 12 or 24 Needed for some CIC hearing aids Introduction 7 Child Size Wedge Style Earhook Telewand Holds probe and reference microphones For checking the telecoil response per during real ear testing ANSI S3 22 1996 Other Optional Accessories RS232 Option RS232 cable Probe Extension Cable for 6040 amp FP40 w o Probe 6040 Sound Chamber Cable External Printer Package serial to parallel converter printer cable and custom cable eY adapter for using both external printer and RS232 e Fartips for insert earphones Eartips 3A medium 50 pk Eartips 3B small 50 pk Eartips 3C large 25 pk Battery Pills AA 41 with 12 cables 24 cables available upon request Maintenance Manual on request at time of purchase 1 4 3 Real Ear Accessories o gt M200 Probe Microphone Mounting Sleeves L for reference mic R for probe mic FONIX FP40 Portable Hearing Aid Analyzer
23. amount equal to the inverse square root of the factor chosen HARMONIC DISTORTION ANALYSIS Type Resolution Reading POWER REQUIREMENTS Voltage Frequency Power Dissipation SAFETY 2nd 3rd and 2nd 3rd total 0 1 percent Percent with respect to total signal Readings made at frequencies from 400 through 2500 Hz 90 VAC to 264 VAC 50 Hz to 60 Hz 40 VA at 120 VAC 60 Hz input normal operation UL approval UL 554 approval upon request BATTERY OPERATION optional Remote Operation 126 Requires optional battery power module Operation possible for 3 hours continuously on battery power with new battery at 25 degrees C FONIX FP40 Portable Hearing Aid Analyzer Auto Shutdown Battery Charger DISPLAY SCREEN General shutdown after no operation of controls for 15 minutes battery operation only Built in automatic battery charger Full charge in 10 hours Backlit Liquid Crystal Display Graphical display 640 pixels wide x 200 pixels high Color Illumination Display Angle PRINTER Type Print Speed Paper Used Paper Width Access Other SOUND CHAMBER Test Area Loudspeaker Blue background with white lettering or white background with blue lettering Fluorescent edge lighted Module tilts from 12 to 90 degrees with respect to horizontal High speed thermal Screen copy in 14 19 seconds Black print on white background Print density adjustable in software FP4
24. and frequency of the signal 3 4 5 Taking a three frequency average To take the three frequency average of a hearing aid you use the AVG feature 1 2 Press F1 to enter the General Setup Menu Select TONE for the SOURCE type if necessary If you don t have the Composite signal on your analyzer you won t see a selection for SOURCE type Use the FREQUENCY and AMPLITUDE knobs to select MAIN F2 or MAIN F3 Press START STOP repeatedly until you select AVG Use the FREQUENCY and AMPLITUDE knobs to select AVG FREQS under PURE TONE SETTINGS Press START STOP to toggle the desired three frequency average represented by the highest of the frequencies See Section 2 4 1 for a list of those frequencies Press F1 to return to the Main Coupler Screen Look at the lower right side of the screen You will see a box listing the SOURCE FREQ and MIC GAIN or MIC SPL of the signal FREQ will be changing rapidly as the analyzer switches between the three frequencies Adjust the amplitude of the signal using the AMPLITUDE knob Watch the MIC GAIN or MIC SPL in the lower right side of the screen change as you adjust the knob 3 4 6 Viewing harmonic distortion 1 2 Press F1 to enter the General Setup Menu Select TONE for the SOURCE type if necessary If you don t have the Composite signal on your analyzer you won t see a selection for SOURCE type Coupler Measurements 45 3 Use the FREQUENCY and AMPLITUDE knobs to selec
25. canal If on the other hand the TM is working into a very small volume then it would affect a large change in impedance across the frequency range CIC Hearing Aid Gain and Frequency Response Changes From the above discussion we see that we can expect that the frequency response of the CIC hear ing aid will be greatly influenced by the frequency dependent impedance changes of the TM What is the magnitude of these changes A fairly typical ear fitted with a standard hearing aid and earmold should have characteristics that would normally be predicted by a KEMAR manikin and standardized ear simulator When that ear is fitted with a CIC aid what is the volume between the hearing aid and the TM Because of the tilt of the TM most professionals probably do not fit the aid right next to the TM A reasonable figure may be 0 25 cubic centimeters It should be realized that this number could be higher or lower depending on circumstances 0 2 to 0 4 cc may be a rea sonable range Now how much response variation will be introduced because of the smaller volume of 0 25 cc This variation is that which is used in the frequency response correction table used with the CIC coupler One assumption that we make in calculations of volumes is that the simulator is small as compared to the wavelength of sound at the frequency we are examining In the case of the stan dard ear simulator the length of the cavity begins to affect its response to sound at frequenc
26. current screen Sometimes it s easy to see PROBE above F5 and think that you are in the probe screen Remember that the label above F5 actually means that you need to press F5 in order to enter the Probe Screen The actual labels for the screens can usually be found in the top center of the screen Small Labels vs Big Labels There are two main types of function keys setting keys that change a common setting in the current screen and directional keys that take you to a different screen In order to easily differentiate between the two types of keys we generally use small letters to denote a set ting key and large letters to denote a directional key There are a couple of exceptions to this rule but not many Here s an example from the Main Coupler Screen General Operation 19 COUPLER NOISE RED ust i REFERENCE MIC OFF LEVELED RMS SOURCE 70 dB iRMS OUT 70 4 dB 1 kHz 2 Figure 2 3 1 The Main Coupler Screen Notice that F1 F4 and F5 are written in large letters They take you to the Menu ANSI 96 and Probe Screens respectively F2 F3 F6 F7 and F9 are all settings that pertain to the current Main Coupler Screen 2 3 2 Customizing the function keys As described in Section 2 3 1 the functions of F1 through F9 will vary depending upon the cur rent screen Most of the time the functions of these keys in each screen are set at the factory and cannot be changed However the FP40 does allow you t
27. curve at this frequency Repeat this for each of the five available frequen cies Use F5 to select the amount of time the first frequency of each I O curve is presented before the measurement is made Use F6 to select the amount of time each subsequent frequency is presented before a mea surement is made This should be at least twice as long as the manufacturer specified attack time Use F8 to SET AGC ON or OFE SET AGC ON will cause the test sequence to pause in order to allow you to adjust the AGC controls of the aid before running the input output curves as required by ANSI 03 If it is not possible for you to adjust these controls SET AGC to OFE but be advised that test results may vary from manufacturing specifications Use F9 if you would like to identify the ear tested Return to the main function button selections by pressing DATA GRAPH Press F8 to save your settings if desired Automated Test Sequences 57 4 1 3 Running the test sequence 1 2 3 4 5 10 11 12 13 14 Level the sound chamber if necessary See Section 3 2 for details Set up the aid for testing See Section 4 1 1 Close the sound chamber Press START STOP when you are ready to begin the test Wait for several tests to be run For most aids the analyzer will pause after performing sev eral measurements in order for you to turn down the gain of the aid If the analyzer pauses open the sound chamber and adjust the gain control
28. door to the right 2 Remove the paper roller wo Place the new paper roll on the roller and insert it into the paper slot Refer to the drawing on the inside of the printer door Pull the black lever to the left of the printer to raise the print head Thread the paper through the printer Push the black lever to the left of the printer to lower the print head again Press FEED and PRINT to test the operation o N A a A Replace the printer door To change the print density The print density controls the darkness of the printout There are five degrees of darkness with 0 being the lightest and 5 being the darkest It is not adjustable on the FP40 D analyzer Select the PRINT DENSITY in the General Setup Menu To save printouts Although the paper we use with the FP40 is a good quality thermal paper any thermal printing can eventually fade over time To minimize fading store away from the light in a cool dry place Do not store the strips in plastic or put cellophane tape on them and avoid fingerprints If you want to be absolutely certain that you will have the data for many years use a regular copier to duplicate the printed results 2 9 3 Using an external printer Follow the directions found in Section 1 6 2 for instructions on hooking up an external printer Note When you use an external printer and an external monitor it will print in the format shown on the video monitor If you use an external pri
29. enter the ANSI 92 screen To change the ANSI 92 settings 1 2 Press F2 to select the desired range of input levels for the frequency response curves Press F3 to select the settling time This is the amount of time that the analyzer presents the Composite signal before taking the measurement You should choose a value twice the pub lished attack specification Press F6 to choose the amount of noise reduction used for the measurements See Section 2 4 2 2 Press F7 to select the type of battery pill used If you don t want to test the battery current drain of the aid you can ignore this selection 4 4 2 Running the test sequence 66 1 2 3 4 5 Level the sound chamber if necessary See Section 3 2 for details Set up the aid for testing See Section 4 2 1 Close the sound chamber Press START STOP when you are ready to begin the test Wait for several tests to be run For most aids the analyzer will pause after performing sev eral measurements in order for you to turn down the gain of the aid If the analyzer pauses open the sound chamber and adjust the gain control of the aid until the MEASURED gain matches the TARGET gain to within 1 dB when the sound chamber is closed Press START STOP to complete the test sequence FONIX FP40 Portable Hearing Aid Analyzer 4 4 3 Viewing the results See Figure 4 4 3 for an an example of ANSI 92 results 1 NSPL90 RMS of Composite signal response curve taken
30. gain measurement at 50 or 60 dB SPL REFTG TARGET and MEASURED The calculated reference test gain and the actual measured reference test gain EQ INP NOISE Equivalent input noise 11 RESP LIMIT and F1 and F2 The response limit level and the two frequencies where the response curve crossed over this level THD The total harmonic distortion measurements HFA SPLITS The three frequency average of the telecoil SPLITS curve STS SPLITS The difference between the high frequency average of the response curve and the SPLITS curve BATTERY Battery current drain I O CURVES Input output measurements at up to five different frequencies HFR 1888 1600 2500 i TiD CURUES dB 1 MAK 135 7 dB 8 9308 138 0 05 05 o4 2 HFA OSPL9 129 8 HFA FOG 38 Figure 4 2 4 ANSI 96 results 62 FONIX FP40 Portable Hearing Aid Analyzer 4 3 ANSI 3 22 1987 The ANSI S3 22 1987 standard is an older version of the ANSI S3 22 1996 standard discussed in Section 4 2 It is still used however in the labeling of hearing aids designed before March 17 2000 In ANSI 87 AGC aids are set at full on gain for all measurements instead of being reduced to refer ence test gain as they are in ANSI 96 and input output measurements are only taken at 2000 Hz as opposed to the five different frequencies offered with ANSI 96 4 3 1 Setting up for the test Follow the instructions found in Section 4 2 1 for instructions on setting
31. into the measurement microphone when taking real ear measurements 5 1 Preparation for Real Ear Measurements There are two steps to set up for a real ear measurement In the first step you set the analyzer up for testing In the second step you set the client up for testing with the analyzer Once this is done you re ready to take the real ear measurements 5 1 1 Setting up the analyzer for testing To set the analyzer up for testing you need to prepare the microphones and set up the sound field speaker 5 1 1 1 To set up the microphones and monitor headset If not already in place slide the Velcro mounting sleeves onto the reference and probe microphones See Figure 5 1 1 1 ot Figure 5 1 1 1 Attaching the mounting sleeves Real Ear Measurements 73 Plug in the monitor headset if you want to be able to listen in on the sound received in the client s ear The monitor jack marked headphones is found on the back of the FP40 The volume on the headphones is controlled with the knob next to the jack 5 1 1 2 To set up the internal sound field speaker Remove the test box from the FP40 compartment Lift the compartment lid on the right side of the FP40 and remove the foam coupler holder The test box is secured in the compartment with an interlocking stop in the back a spring catch in front and velcro on the bottom See Figure 5 1 1 2A speaker jack pop up Speaker post spring catch speaker jac
32. may be useful to explain to your client that his or her head may have to be in an unusual position to take full advan tage of the telecoil or that it may be possible to turn the telephone receiver to increase the ampli tude of the signal Some users have both a telecoil and a separate sound chamber For these users we supply a Y cord so that both the sound chamber and the telecoil may be hooked up at the same time 124 FONIX FP40 Portable Hearing Aid Analyzer Appendix A Specifications SINE SIGNAL Frequencies Normal Sweep Frequencies Fast Sweep Frequencies Short Sweep Warbled Sinewave Amplitude RMS Harmonic Distortion 1 12 octave frequencies from 200 to 8000 Hz closest 100 Hz within 1 96 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 4 2 5 2 6 2 8 3 0 3 1 3 3 3 5 3 7 4 0 4 2 4 5 4 7 5 0 5 3 5 6 6 0 6 3 6 7 7 1 7 5 8 0 kHz 0 2 0 3 0 4 0 5 0 6 0 8 1 0 1 2 1 6 2 0 2 5 3 1 4 0 5 0 6 3 8 0 kHz 1 2 octave frequencies closest to 100 Hz Has a 5 96 33 1 3 Hz warble Coupler mode 40 dB SPL through 100 dB SPL in 5 dB steps Probe mode 40 dB SPL through 90 dB Accuracy at reference point after leveling 2 5 dB for 500 Hz through 3500 Hz 3 5 dB for all other frequencies at 70 dB SPL Less than 0 596 for 500 800 and 1600 Hz COMPOSITE SIGNAL optional Frequencies Amplitude Crest Factor From 200
33. most accurate RECD 1 Press F1 from the Main Coupler screen not the Target 2 cc screen to enter the setup menu 2 Press F4 CAL MIC S 3 Attach the calibration clip to the larger coupler microphone so that the metal tube hangs off the very tip of the microphone See Figure 5 6 1 1A To 3A insert earphone 7 25 mm I D 1 93 mm HA 2 Coupler POSER Coupler mic Figure 5 6 1 1A Attaching the two microphones Figure 5 6 1 1B Coupling the coupler microphone together to the insert earphone 4 Thread probe tube connected to the probe microphone through tube so that the probe tube sticks out over the grill of the coupler microphone 5 Put assembly in sound chamber and close chamber door 6 Press F6 COMPEN PROBE This will measure and store the differences between the two microphones 7 Press F1 EXIT Real Ear Measurements 97 8 10 11 12 13 14 15 16 Plug a 50 ohm insert earphone into the external speaker jack on the back of the FP40 An adapter may be needed if you are taking the insert earphone from an audiometer Insert the larger coupler microphone into HA 2 coupler Attach insert earphone plastic tip to the tubing of the HA 2 coupler See Figure 5 6 1 1B Press F5 to enter PROBE mode Press F1 to enter MENU Press F4 to enter CAL MIC S Press F7 to select HA2 ER3A Press START STOP to begin measurement A WAIT message will appear on you
34. pill into the aid Insert the end of the earhook of the hear ing aid into the plastic tubing of the ear level adapter Insert the measurement microphone into the HA 2 2 cc coupler Snap the ear level adapter onto the end of the coupler Place the hearing aid coupler combination into the sound chamber so that the micro phone of the aid is directly over the center of the speaker Roll some Fun Tak into a rod long enough to go around the transmitting end of the aid Modeling clay can also be used but it doesn t work as well Bend the Fun Tak rod around the canal of the aid making the resulting donut flush with the end of the aid Some users choose to seal the vent opening at this end with a small amount of Fun Tak 39 40 3 Align the sound opening of the aid with the hole at the conical end of the coupler Look through the open end of the coupler to be sure the sound opening of the aid is clear of obstructions and correctly placed 4 Seal the outside opening of any vent on the aid with a small kernel of Fun Tak 5 Complete the acoustical sealing of the aid to the coupler by using a pencil or finger You may want to double check the aid placement through the open end of the coupler at this point FONIX FP40 Portable Hearing Aid Analyzer Coupler Measurements Slowly insert the microphone into the coupler You may feel an initial resis tance when the mic reaches the O ring Continue
35. printer package 8 External sound source 118 External telecoil 7 External video 3 F FM40 microphone 6 FM systems 114 Front panel 10 Full menu 18 Function keys 17 19 customizing 20 G Gain 46 General setup menu 17 153 H Harmonic distortion 45 Hearing aid setup 39 body aid 41 eyeglass aid 41 ITE ITC CIC 39 History of changes 133 ICRA 23 43 48 ID Option 3 IEC 55 67 results 69 settings 68 Insertion gain 88 Intermodulation distortion 2 ISI 55 J JIS 55 K Knobs front panel 12 L Label 31 Lamps front panel 11 LCD screen 10 Leveling 36 37 sound field 79 Line power 11 M M200 Microphone 8 Magnetic fields 123 Main Coupler Screen 35 39 42 44 45 47 48 52 53 microphone adapter 5 Monitor headset 9 Mounting sleeves 8 Multiple measurements 44 N Navigation 17 18 21 22 23 24 25 26 28 29 30 31 o Occlusion effect 117 OES Option 4 53 Opening Screen 32 Open fit 89 154 Options Battery pack 3 CIC 4 Composite 2 Digital Speech 2 ID 3 OES 4 Probe 3 RS232 4 Telecoil 1 VGA 1 Output 46 P Partial menu 18 prescription 3 Printer external 30 internal 29 Probe Option 3 Probe tube 78 Profiler 55 70 results 71 Pure tone display 35 settings 22 source 42 sweep 21 49 R Rear panel controls 12 RECD 96 coupler 97 custom test 135 real ear 98 Reference microphone 46 Reference microphone 89 90 Reset level 108 RS232 connection 12 RS232 Option 4 8 S
36. result all hearing aids designed or with significant design changes after March 17 2000 must be labeled to the ANSI S3 22 1996 standard All hearing aids manu factured today but with no significant design changes since March 17 2000 can continue to be labeled to the ANSI S3 22 1987 See Section 4 3 for more details on ANSI 87 4 2 1 Setting up the aid for testing When possible follow the procedure recommended by the hearing aid manufacturer when setting up the aid to perform an ANSI test sequence Otherwise use the following guidelines Set the controls of the aid except the compression controls to give the greatest possible out put and gain Automated Test Sequences 59 Set the aid for the widest frequency response range Set AGC aids to achieve greatest possible compression Make sure the gain control of the aid is full on Follow the instructions from Section 3 3 to set up the aid in the test box for testing 4 2 2 Setting up the analyzer for testing To enter the ANSI 96 screen 1 From the Main Coupler Screen look at the FP40 s display above the F4 function key If it says AN96 skip to step 6 Press F1 Menu Use the AMPLITUDE and FREQUENCY knobs to select MAIN F4 under FUNCTION KEY DEFIN Press START STOP to choose AN96 This will let you use the F4 function key to enter the ANSI 96 screen from the Main Coupler Screen 5 Press F1 to return to the Main Coupler Screen 6 Pres
37. s earmold or shell Place or hold the ear mold next to the probe tube so that the tube rests along the bottom methods Method 1 1 2 of the canal part of the earmold with the tube extending at least 5 mm 1 5 inch past the canal opening If there is a large vent you can slide the tube down the vent until it protrudes at least 5 mm past the canal opening 3 Mark the probe tube where it meets the outside surface of the earmold with a marking pen See Figure 5 1 2 3A 4 Attach the probe tube to the body of the probe microphone 5 Attach the probe microphone to the round Velco pad on the earhook 6 Insert the probe tube without the earmold or aid into the client s ear so that the mark is at the location where the bottom of the outer surface of the earmold will be once the earmold is in place See Figure 5 1 2 2 Method 2 Figure 5 1 2 3A Marking the probe tube This method is easiest if you have the Composite Option It uses the fact that there is a dip in gain caused by a standing wave created by the 6 kHz frequency reflecting off the eardrum Press F5 to enter Probe Mode Press START STOP to start a measurement 1 2 Press F7 to select the Composite signal You may have to press the button repeatedly 3 4 Insert the probe tube carefully looking at the composite measurement At some point there will be a large dip at 6 kHz caused by the standing wave inside the ear Keep inse
38. select REFERENCE MIC under COUPLER SETTINGS 6 Press START STOP to toggle on 7 Press F1 to return to the coupler measurement screen 8 Press the LEVEL button 9 Press the START STOP button This will level the sound chamber When you want to test a different aid you must level the sound chamber again to account for the difference in the size of the hearing aid If the hearing aid is an identical model you won t have to re level 3 2 3 Saving the leveling information To save the sound chamber leveling so that you won t have to re level the sound chamber the next time the analyzer is turned on Figure 3 2 2 Leveling with reference microphone 1 Press MENU to enter the General Setup Menu 2 Press F5 to store the coupler leveling 3 Press F1 to return to the testing screen 3 3 Hearing Aid Setup To set up the analyzer and the hearing aid for testing you connect the hearing aid to a coupler The standard couplers of the FP40 analyzer are the HA 1 and HA 2 couplers These couplers contain 2 cc of space simulating the amount of space in a person s ear canal Other available couplers include the MZ series couplers used in the OES and JIS Options and the CIC coupler 38 FONIX FP40 Portable Hearing Aid Analyzer 3 3 1 Setting up a BTE 3 3 2 Setting up an ITE ITC CIC Coupler Measurements Adjust the tone and gain controls of the aid to the desired positions If desired insert a battery
39. showing the directional advantage All you need is a swivel chair to turn the client around during testing or an external speaker on a swing arm to move the speaker around the cli ent Since we re going to use the Insertion Gain screen for this measurement in order to show the differ ence between the forward and reverse responses we re going to treat the reverse measurement as the unaided measurement and the forward measurement as the aided measurement 5 11 1 Reverse Measurement 1 Set up the analyzer as you would for any real ear measurement Use a 0 azimuth position ing when you level the sound field speaker See Section 5 1 for details 2 Insert the probe tube and the hearing aid 3 Turn OFF the reference microphone To do this press F1 from any real ear measurement screen and change the REFERENCE MIC setting to OFF under Probe Settings Use the AMPLITUDE and FREQUENCY knobs and the START STOP button to make this selection Press F1 again to return to the real ear measurements screen 4 Look above F2 on any real ear measurement screen IG should be highlighted If it is not select IG with F2 5 Select the source type with F7 If available choose one of the Digital Speech signals or the Composite signal Otherwise select the pure tone FAST signal 6 Make sure UNAIDED is highlighted above F2 If it is not you may need to press F2 to high light it 7 Select the source signal using the AMPLITUDE knob T
40. sure the the power cable is plugged into a working wall outlet c Check the fuse in the power entry module 2 CRT VGA LCD display monitor is not working Check the ON switch CRT VGA monitors only Make sure the power cable is plugged into working wall outlet Check the monitor brightness and contrast controls and the LCD contrast knob Check the Screen Saver push any front panel button to activate the screen angop TEST CHAMBER PROBLEMS 1 Test Chamber Microphone does not Level Check your mic calibration Is the mic properly plugged into the instrument Are all connections clean and tight Is the mic cable loose broken cut or worn or frayed Make sure everything is out of the test chamber except the mic when trying to Level See Operator s Manual Open the test chamber and listen for the leveling signal g Is there an unusal amount of background noise in the test area air conditioning heating fans street noise people talking computer fans etc Pang ph COUPLER PROBLEMS 1 HA 2 Coupler BTE adapter tubing is missing loose or cracked Replace with 13 thickwall tubing Length 0 6 15mm 2 Test microphone is difficult to get into coupler or the ear level adapter does not easily seal to the other end of the coupler Lubricate the black O ring with light petroleum type lubricant FONIX FP40 Portable Hearing Aid Analyzer 143 3 A bump or peak in the low frequency response curve
41. tube and level the sound field speaker as described in Section 5 1 3 Insert the client s hearing aid into the ear making sure not to dislodge the probe tube 4 Select the desired source type with F7 See Section 2 4 for a discussion of source types Select the desired amplitude for the first aided measurement by using the AMPLITUDE knob We recommend a soft speech level such as 50 dB SPL 6 Press START STOP to start the measurement If you are using a composite fast pure tone or Digital Speech signal you will have to press START STOP again to stop the measurement when it stabilizes This soft speech measurement curve should exceed the patient s thresh old levels enabling the patient to hear soft speech 7 Press F3 to select AIDED 2 8 Select the source level with the AMPLITUDE knob We recommend using 60 70 dB SPL for a medium speech level measurement Normally this measurement will be taken with the same source type used in the first aided measurement curve 9 Press START STOP to start the measurement If you are using a composite fast pure tone or Digital Speech signal you will have to press START STOP again to stop the measure ment when it stabilizes This medium speech measurement curve should meet the target enabling the patient to hear normal speech 10 Press F3 to select AIDED 3 11 Use F7 to select the source type Since AIDED 3 is usually done at 90 dB SPL we recommend the SHORT pure tone swee
42. viewing everything that is measured by the analyzer s microphone The source signal is not subtracted 3 4 9 Testing with the reference microphone You can use the FP40 to perform coupler measurements with or without the reference microphone We generally recommend to test without the reference microphone when performing coupler mea surements because it s easier faster and almost as accurate However testing with the reference microphone when done correctly is slightly more accurate than testing without it See Figure 3 4 9 for pictures of aids tested with the reference microphone Things to keep in mind when testing with the reference microphone You must relevel the sound chamber with the reference microphone every time you switch hearing aids See Section 3 2 2 for instructions 46 FONIX FP40 Portable Hearing Aid Analyzer You must position the reference microphone properly If you don t have the reference micro phone positioned next to the microphone of the hearing aid you will get inaccurate results Worse if you leave the reference microphone outside the chamber when it is turned on you will get wildly inaccurate test results To turn on the reference microphone 1 Press F1 to enter the General Setup Menu 2 Use the AMPLITUDE and FREQUENCY knobs to select REFERENCE MIC under COUPLER SETTINGS 3 Press START STOP to toggle the selection from OFF to ON 4 Press F1 to return to the Main Coupler Screen You will
43. you don t have Digital Speech on your analyzer you can still perform accurate measurements of the hearing aid using the Composite signal Most noise suppression features on high end digital aids will accept a continuous signal for several seconds before decreasing the gain of the hearing aid 48 FONIX FP40 Portable Hearing Aid Analyzer To use the Composite signal to test high end digital aids you first need to figure out how long you can present the signal before the aid s noise suppression goes into effect Follow these instructions 1 Follow the instructions from Section 3 4 1 to select the Composite signal as the source type 2 Use the AMPLITUDE knob to select 65 dB 3 Press START STOP and watch the response curve carefully If the noise suppression of the aid is working properly you should see the amplitude of the curve drop after several seconds Some aids might take 3 5 seconds while other aids will take 10 15 seconds Press START STOP again when finished 4 Estimate the amount of time it took for the noise suppression to kick in If you don t see any noticeable difference in the response of the aid after 15 seconds either the aid s noise suppression isn t working or it s not the type of aid that requires special consideration when testing Now test normally using the Composite signal Make sure to turn off the signal by pressing START STOP again before the time you estimated in step 4 passes This will
44. you will purchase a hospital grade moni tor However if we ship you our industrial grade monitor we will not affix the UL tag This symbol indicates that Frye Electronics conforms to the Medical Device Directive 93 42 EEC If an external monitor or printer is used it should also have a CE mark in order for the FP40 to remain compliant FONIX FP40 Portable Hearing Aid Analyzer Appendix B Calibration Calibration Your new instrument has been calibrated at the factory However from time to time you will wish to check it with an external source a sound level calibrator Frye Electronics offers the QUEST QC 10 calibrator especially adapted to our equipment but other models can also be used While in the SETUP menu push F4 CAL MIC s Calibrating the Coupler Reference Microphone 1 Place the 1 to 14 mm adapter in the QC 10 calibrator Place the coupler reference larger microphone in the adapter See Figure B 1 2 3 4 Turn on the calibrator noticing the stated output 114 dB The measured output can be seen on the display If it is higher or lower than the desired output you may adjust the calibration by using a small screwdriver at the REF GAIN con trol inside the sound chamber Fig B 2 You must first remove the sound box on FP40 units with serial no 941655 and higher and FP40 Ds with serial no 944402 and higher Figure B 1 Figure B 2 Calibration 129 Calibrating the Probe Microphon
45. your display Help messages and function key labels will not print Here are some general instructions Press PRINT to start printing Press PRINT again to stop printing Press FEED to feed the paper 2 9 1 Selecting the printer 1 Press F1 from almost any screen to enter the General Setup Menu 2 Select PRINT in the GENERAL SETTINGS column using the frequency and amplitude knobs 3 Press START STOP to cycle through your choices They are INTERNAL for the thermal printer HPCL MONO for an external black and white HP style printer HPCD COLOR for an external color HP style printer EPSON 9 MONO for an external black and white Epson printer EPSON 9 COLOR for an external color Epson printer 4 Press F1 to exit from the General Setup Menu 2 9 2 Using the thermal printer To use the thermal printer just follow the directions found in Section 2 8 1 to make sure that INTERNAL is selected for PRINT in the General Setup Menu and push the PRINT button Possible errors If the printer is out of paper it won t function and you will see the message PLEASE INSTALL NEW ROLL OF PAPER IN THE PRINTER on the bottom of your screen General Operation ple If the print head is up you will see the message PLEASE PUSH LEVER NEXT TO THE PRINTER To correct this push the black lever to the left of the thermal printer To change the paper 1 Remove the printer door by pushing the small black knob on the printer
46. 0 only 60 mm Through top mounted door Unit also works with HPCL and EPSON or compatible printers through a serial port 3 x 3 7 5 x 7 5 cm in acoustical foam treated area Separate space for excess microphone cord storage 3 cone mounted in case Case mounts on a swivel arm for probe operation EXTERNAL CONTROLS INDICATORS AND CONNECTORS Front Panel Buttons Rotary Controls A C Power Switch Jacks Specifications 9 function keys plus Print Feed Data Graph Level Reset Start Stop and Operate On Off with guard ring Front Amplitude Frequency Rear Probe monitor level Rocker type rear mounted RS232 9 pin probe monitor earphone 1 4 stereo external speaker jack 3mm phone jack and VGA 15 pin 127 PHYSICAL DESCRIPTION Dimensions Color Weight SAFETY Safety Approval CE Mark Back Panel 128 20 125 x 14 750 x 6 5 50 5 x 36 9 x 16 25 cm with lid on case Light grey with black trim white control panel FP40 25 pounds 11 40 kg with lid and battery 22 pounds 10 kg without battery FP40 D 16 5 pounds without accessories Note that for the UL listing to be valid all mains connected elec trical equipment attached to the FP40 FP40 D must conform to UL 544 Display monitors and computer equipment attached to the FP40 FP40 D must be medical grade If you order the VGA Option without the monitor we will continue to affix the UL tag on the assumption that
47. 700 3 8 4700 4 75 6700 8 8 800 0 7 2800 3 85 4800 4 8 6800 8 2 900 1 2900 3 95 4900 4 85 6900 6 55 1000 1 2 3000 4 5000 4 9 7000 6 1100 1 4 3100 4 07 5100 4 95 7100 5 4 1200 1 65 3200 4 12 5200 5 7200 4 95 1300 1 9 3300 4 18 5300 5 05 7300 4 2 1400 2 1 3400 4 2 5400 5 1 7400 3 6 1500 2 2 3500 4 25 5500 5 15 7500 3 3 1600 2 4 3600 4 3 5600 5 2 7600 2 8 1700 2 5 3700 4 35 5700 5 25 7700 2 3 1800 2 7 3800 4 4 5800 5 3 7800 2 1900 2 85 3900 4 45 5900 5 4 7900 1 7 2000 2 91 4000 4 5 6000 5 5 8000 1 2 2100 3 4100 4 52 6100 The FONIX CIC Option 139 Appendix F Storage Compartments in the FP40 pull up here Accessories are stored in three compartments located inside the FP40 s carrying case lid To open a compartment pull upward at the top recessed area The lid which is held in place with velcro will come completely off To replace the lid align its bottom edge with the bottom edge of the compartment interlocking them as shown here Press the top of the lid down to secure it in place Storage Compartments in the FP40 141 Appendix G Troubleshooting Guide These are the most common problems that typically cause instrument failure Please check these troubleshooting suggestions and follow the procedures outlined in this manual before contacting your local service representative or Frye Electronics GENERAL PROBLEMS 1 No power a Check ON switch s b Make
48. AT 13 ZIHC BIR mH Figure 2 6B Coupler screen with battery drain Note You must use a pure tone or composite source for the battery current drain to function It will not work with the Digital Speech source types General Operation 27 2 7 Using the DATA button Although it s usually more useful to display test results in the familiar graph format it can often be useful to look at the actual numerical data You can do this in the Main Coupler Screen or in the real ear measurement screens To switch back and forth between graphical and numerical data format press the DATA GRAPH button on the FP40 main panel See Figure 2 7 FREQ GAIN ikHz d D bul zu m o t hu mm COMPOSITE ANSI WEIGHT GAIN PREFERENCE MIC OFF LEVELED iRMS SOURCE 78 dB RM 3 dB S OUT 82 Soo VOU Foe Goon m0 edo E E E E SOOO CDI E A DO JO CI CN E Cb boo Jas CE CARI Co IN IRI RE IRI IA I Ie e pa B 3 9 3i 5 8 2 29 V 7 6 9 8 3 9 8 1 5 2 5 4 1 95 51 9 9 S 1 rare nl BHT 13 eine BIE F m COUPLER Figure 2 7 DATA coupler screen Notes Only one measurement curve can be displayed in numerical format at a time When working with multiple measurement curves select the curve you want to view with F6 in the Main Coupler Screen and F3 in a real ear measurement screen The DATA GRAPH button only works in the Main Coupler Screen and the real ear measure ment screens You c
49. Accessories The standard and optional accessories available for the FP40 analyzer are described in this section 1 4 1 Standard Accessories Microphone Adapter HA 1 2 cc Coupler 14 mm to ANSI 1 diameter microphone Dimensions per requirements of ANSI size This is used for calibrating the FP40 S3 7 for testing in the ear aids microphones HA 2 2 cc Coupler Ear Level BTE Adapter Dimensions per requirements of ANSI Snaps into the 1 4 6 35 mm diam S3 7 for testing ear level eyeglass and eter cavity in the HA 2 2 cc coupler or body aids the MZ 2 coupler Equipped with a 0 6 15 mm length of 0 076 1 93 mm ID tubing the adapter allows ANSI 83 22 specified connection of an ear level aid to the coupler Introduction FM40 Microphone Provided if the Real Ear Option is not ordered 1 4 2 Optional Accessories D BON 6 CC Coupler Per ANSI 3 7 for NBS 9A used to check output of audiometers Battery Pills With 12 30 cm cables 24 60 cm cables available upon request 13 675 65 312 10A 230 All pills optional with FP40 D Operator s Manual Sound Level Calibrator For microphone calibration FONIX FP40 Portable Hearing Aid Analyzer 6040 Sound Chamber For control of external noises Open Ear Coupler Non standard coupler used for realistic testing of open ear hear ing
50. Aids Open fit hearing aids have been known to interfere with the reference microphone measurement outside the ear To determine if a particular hearing aid is interfering with the reference micro phone perform the following measurement in the insertion gain screen The feedback cancellation and other features normally used by the patient should be enabled on the hearing aid 1 Measure the aided response as described in Section 5 3 3 The sound field speaker should be LEVELED The reference microphone setting should be ON The reference microphone status is dis played in Status box F3 should be set to AIDED 1 The source amplitude should be set to 65 dB SPL Use the Amplitude knob to adjust the source if necessary F7 should be set to DIGSP ANSI or COMPOSITE 2 Press START STOP to start the measurement Press START STOP again when the measure ment has stabilized 3 Use F3 to select AIDED 2 4 Press F1 to open the menu Use the Amplitude and Frequency knobs to select REFERENCE MIC under PROBE SETTINGS Press START STOP to change the setting to OFE Press F1 to return to the Insertion Gain screen 5 Measure the aided response as described in Section 5 3 3 The source amplitude should be set to 65 dB SPL Use the Amplitude knob to adjust the source if necessary F7 should be set to the source type used in Step 1 6 Press START STOP to start the measurement Press START STOP again when the measu
51. Coupler FOG Vent Corrections Frequency Hz 250 500 Tight Seal Slit Leak 1mm 2mm Long Open Short Open Note Use starred values only if prescribed insertion gain is greater than 0 dB at that frequency Otherwise use no correction Blanks indicate use no correction A slit leak is assumed for all vent conditions except Tight Seal 5 7 7 Understanding the technical details For those of you who are interested in how we came about the correction factors used in the Target 2 cc screen here is the technical information Average unaided The average ear data is from KEMAR large right ear measured with the reference microphone one centimeter above the apex of the pinna with the probe tube microphone opening approximate ly 17 mm into the ear canal with the loudspeaker at ear level 12 inches from the head surface at an azimuth angle of 45 degrees Average RECD The occluded ear SPL was measured using an Etymotic Research ER 3A insert earphone with the foam tip inserted 12 mm into the same KEMAR ear as above with the probe microphone 5 mm beyond the sound opening The 2 cc coupler SPL was measured with the ER 3A attached to the opening of an HA 1 coupler using the same probe microphone arrangement as in the occluded ear Aid type Same KEMAR ear and configurations of the reference microphone and loudspeaker as for the aver age unaided ear correction No correction for BTE because the reference microphone is preci
52. ERR SELECT LEFT INSERTION i TARGET 16 IXkHD 2 8 NAL 2 Figure 5 3 3 The aided response Other functions Turn on off the display of the selected aided curve by pressing F6 Clear all measurement curves by pressing F8 Set the OUTPUT LIMIT under PROBE SETTINGS in the Menu screen This sets how loud a signal the probe microphone will level without automatically shutting down the sound field speaker to protect the client Enter the Menu screen by pressing F1 Use the AMPLITUDE and FREQUENCY knobs to select the setting and use the START STOP button to toggle the desired selection Use the F9 button to toggle whether or not you want a label included with a real ear measure ment printout 5 3 4 Viewing insertion gain Insertion gain is the difference between the unaided response and the aided response In other words it is the amount of amplification provided by the hearing aid not including the natural amplification of the unaided ear If you have created a target as described in Section 5 1 it will be displayed as a thick solid line in the large graph on the left side of the real ear insertion gain screen Any measured insertion gain responses will be displayed as thinner lines on the same graph You can display up to three differ ent insertion gain measurements at the same time See Figure 5 3 1 for a view of the insertion gain display 88 FONIX FP40 Portable Hearing Aid Analyzer 5 3 5 Testing Open Fit Hearing
53. F3 Press START STOP repeatedly to select CIC Press F1 to return to the Main Coupler Screen FONIX FP40 Portable Hearing Aid Analyzer 6 Press F2 or F3 selected in step 3 to turn the CIC correction factors ON 7 Test as usual See Section 3 4 2 See Figure 3 7 for a comparison of a CIC aid tested with an HA 1 coupler and the same aid tested with a CIC coupler and correction factors qm SE RED 4 i CRU 1 DIGSP AGAIN 78 dB REFERENCE mic OFF ERY 2 Bigsp AGAIN 76 dB BEVELED i ICRU if EMPTY N RMS SOURCE 78 dB RMS OUT 95 3 dB Figure 3 7 CIC vs HA 2 comparison 3 8 The OES Option The OES Occluded Ear Simulator Option allows you to simulate the test results you would get using a standard ear simulator IEC 711 or Zwislocki coupler provided the hearing aid or mold being tested in not vented It consists of three MZ couplers MZ 1 MZ 2 and MZ 3 and corre sponding correction factors To use the OES Option 1 Use the proper MZ coupler and connect the aid as usual See Figure 3 8A 2 Press F1 to enter the General Setup Menu 3 Use the AMPLITUDE and FREQUENCY knobs to select MAIN F2 or MAIN F3 4 Press START STOP repeatedly to select OES 5 Press F1 to return to the Main Coupler Screen 6 Press F2 or F3 selected in step 3 to turn the OES correction factors ON 7 Test as usual See Section 3 4 2 Corrections will be made to all measurement curves data displays and individual measurements See
54. FONIX FP40 FP40D PORTABLE HEARING AID ANALYZER OPERATOR S MANUAL A Note on this Manual The instructions in this manual are for software version 3 70 and above with references to earlier software However you may contact Frye Electronics for a more appropriate manual if you have earlier software Software Version 3 70 September 2005 Frye Electronics Inc Rev Jun 04 2007 All Rights Reserved Table of Contents Chapter 1 Introduction Tal Description 4 2 eden AURI ESODMEPERS IUS eA Ba eb ee RUE 1 1 2 Hardware History gt 44 243 dd bind P Bra cum tive tala dad esee baud quee dde 1 1 3 Features amp Options sceso ead cee cece see er era Re eae TER RR 2 1 3 1 Composite Digital Speech Option 64 05 44 eet ie ee ewe Aa Dabo YS 2 1 3 2 Probe Optioner oa tC x AY RAG OR OG d RE We caf 64 9 1 3 3 External Video Monitor i oi ice ERU 24420 9 AR URES AREAS ERE TO 3 13 4 Battery Pack Option ceris score scan CI pa ec IRI eques Wer pun EEY Ks 3 1 3 5 ID OptiOB ze eR CORP REV IO Re a rao PE ME 4 1 3 6RS232 OPON 033 6c oh ches AO etes t eere RR Ie See ere ee latens 4 1 3 7 OES Occluded Ear Simulator Option 0 0 0 cee eee een ee 4 1 3 8 CIC Completely In the Canal Optlon nuca caw Meek eae ER eA ee ee 4 1 4 Accessories olv Lebe er ye Gon BER CHEER EROS Ape A ase Oe ees Ae 5 124 1 Standard AGCOSSOTIGS ivre ak ei Welw doceo Meat e NS RO OQ OLE Reds 5 142 Optional Accessories eou uid i we
55. Frequency knobs Select VGA by pressing the START STOP button You can also use this selection to switch back to LCD mode 2 6 Battery Current Drain You can measure the battery current drain of hearing aids in the Main Coupler Screen and in any of the screens of the automated test sequences such as ANSI 96 To do this you must insert the appropriate battery pill into the hearing aid and plug the battery pill into the jack located on the left side of the internal sound chamber See Figure 2 6A Figure 2 6A Using a battery pill to measure the battery current drain 26 FONIX FP40 Portable Hearing Aid Analyzer To turn on the battery current drain measurement in the Main Coupler Screen Press F1 MENU from the Main Coupler Screen Select BATTERY DISP in the third column of the screen under COUPLER SETTINGS Press START STOP to toggle ON KR WwW N H Press F1 to exit back to the Main Coupler Screen You should now see a battery current read ing under the Status Box See Figure 2 6B 5 Press F7 to select the battery pill that you are using To set the default battery pill 1 Press F1 MENU from the Main Coupler Screen 2 Select BATTERY in the third column on the screen under COUPLER SETTINGS 3 Press START STOP to toggle the desired selection 4 Press F8 to store that selection as the default COUPLER COMPOSITE ANSI WEIGHT GAIN REFERENCE MIC OFF LEVELED RMS SOURCE 78 dB RMS OUT 82 3 dB B
56. Frye support at support frye com or call the factory HTL dBHL 0 5 10 15 20 25 30 35 40 45 50 55 60 UCL HL 97 99 99 98 97 101 102 101 103 105 107 108 110 HTL dBHL 65 70 75 80 85 90 95 100 105 110 115 120 UCL HL 114 115 117 120 120 124 130 127 133 134 137 140 FONIX FP40 Portable Hearing Aid Analyzer 147 Appendix DSL Programming Notes Notes on the DSL Programming The DSL Desired Sensation Level software in the FONIX FP40 FP40 D program is based on the latest copyrighted I O computer program The DSL method was originally described by Seewald Ross amp Stelmachowicz in 1987 Its purpose was to provide amplified speech that is consistently audible comfortable and undistorted across the broadest relevant frequency range Recently this method has been elaborated to attempt to provide audibility for as broad a range of inputs as possible The goal is to make soft sounds audible bring average speech sounds to the most comfortable level to maximize speech discrimination and to keep loud sounds from exceeding the comfort level of the hearing aid wearer These goals are addressed by the WDRC formula The original purpose of the DSL method was to fit hearing aids on children Children present particular obvious problems in testing Since it is often impossible to get as much reliable data as needed from the child methods were developed to predict audiometr
57. G carefully see procedure below You do not want to damage your client s hearing or cause them discomfort during testing To ensure safety and com fort the FP40 system reacts automatically when the OUTPUT LIMITING level is exceeded at the Probe Microphone When the level measured at the Probe Microphone exceeds the pre set limit the words PROBE OUTPUT LIMIT EXCEEDED appear on the screen and the program automatically stops The default setting for OUTPUT LIMITING is 120 dB SPL You can set the OUTPUT LIMITING to any level between 90 and 140 dB SPL in 5 dB increments see procedure below In special cases when you select 130 or 140 dB SPL be aware that extra care is necessary with any output that may exceed 132 dB SPL Keep in mind that the sound pressure level at the eardrum can be higher than that measured at the mid ear canal position especially at high frequencies For this reason we recom mend extreme caution when using pure tones for in situ SSPL measurements Whenever the output limiting function has stopped the test signal you must either turn down the hearing aid lower the source SPL or change the output limit To view or change the OUTPUT LIMITING setting 1 Push F1 SETUP MENU 2 Use the AMPLITUDE amp FREQUENCY knobs to move the cursor to PROBE PARAM ETERS OUTPUT LIMITING 3 Use the START STOP button to choose the desired limit 4 Return to PROBE by pushing F1 EXIT MENU Real Ear Measur
58. HE OCCLUSION EFFECT OF A HEARING AID This simple procedure will help you measure the occlusion effect of the hearing aid wearer s own voice The spectrum analysis mode will help you judge the sometimes uncomfortable feeling caused by the occlusion effect of a hearing aid You will be able to measure the effect and the improve ments made after venting adjustments have been made Suggested procedure 1 Press F5 from the Main Coupler screen to enter the Probe Mode 2 Use F2 to select SPL 3 Use F7 to select a source type of COMPOSITE 4 Use the AMPLITUDE knob to turn the source all the way OFF This puts the analyzer in Spectrum Analysis Mode 5 Place the probe tube as close as possible to the eardrum Marking the probe tube depth at 25 30 mm should accomplish this in an average adult ear canal Position the client 12 from speaker at a 45 degree angle Spectrum Analysis 117 Use F3 to select AIDED 1 Place the hearing aid in the ear The aid should be turned off Push the START STOP button Instruct the client to sustain the vowel sound ee 395 goo S OY While the ee is still sounding and once the curve on the screen has stabilized press START STOP Note the total RMS Output in the ear canal as indicated in the status box 10 If the SPL seems high you might modify the vent size Use F3 to select AIDED 2 and repeat steps 6 and 7 If your changes have been successful you should see a lessening of total RMS
59. Hz to 8000 Hz in 100 Hz intervals Accuracy within 196 Coupler mode RMS 40 dB SPL through 100 dB SPL in 5 dB steps Probe mode 40 dB SPL through 90 dB Accuracy at refer ence point after leveling 2 5 dB for 0 5 kHz through 3 5 kHz 3 5 dB for all other frequencies Less than 9 dB BATTERY CURRENT MEASUREMENT Measurement Range Current Limit Accuracy Resolution Simulated Battery Types Battery Voltages Supplied Specifications 0 mA to 25 0 mA 0 mA to 55 mA 3 of full scale 1 digit 0 1 mA 5 10 A 230 13 312 and 675 zinc air 13 312 and 675 mercury 13 312 76 silver AA and 41 mercury 1 5 V for silver oxide and AA 1 3 V for mercury and zinc air 125 Tolerance Battery Type Selection 0 01V no load Under software control from front panel but proper size battery pill must be selected DIGITAL READOUT OF SPL Frequency Range Amplitude Range Max Input Signal Resolution Type Accuracy SYSTEM NOISE Equivalent Input Noise Noise Reduction 200 Hz through 8000 Hz O dB SPL through 149 9 dB SPL 70 dB through 100 dB gain 150 dB SPL 0 1 dB True RMS if Source is set to off From 250 Hz to 2500 Hz 2 dB one digit All other frequen cies 3 dB one digit 50 dB SPL RMS Averages the measured signal in synchronism with the signal generator by the factor chosen Averaging factors from 2 to 16 available in powers of 2 Random noise will be reduced by an
60. IFIED PERSONNEL Figure 1 5 5 Rear Panel 1 5 5 Rear Panel Controls External Speaker A miniature phone jack that allows an external sound field speaker or sound Headphones Serial Interface CE Mark Video Monitor External Power box FONIX 6040 to be connected to the speaker drive from the FP40 A standard 1 4 inch phone jack and volume control that allows the monitoring of the sound reaching the probe microphone Nine pin D jack for RS232 connection and laser printer connection This symbol indicates that Frye Eelctronics conforms to the Medical Device Directive 93 42 EEC If an external monitor or printer is used it should also have a CE mark in order for the FP40 to remain compliant Units with serial numbers 940000 and above have VGA connectors Older units have RCA jacks for composite monitors Main power input switch On the portable version operate button on front panel must also be pushed to activate the instrument FONIX FP40 Portable Hearing Aid Analyzer 1 5 6 Right Side Mounted Jack and Module Line input connector IEC computer variety Dual snap in fuse holder Instrument will automatically choose the proper voltage 1 5 7 Sound Chamber Mounted Jacks and Controls Jacks Battery replacement pill jack Microphone jack Controls Gain controls for microphones Found on the left side of the sound chamber near te speaker Marked Probe Gain and Ref Gain 1 5 8 Top of Instrument P
61. ING Log LEUELED i RMS SOURCE 5 iRMS DUT a dB i 58 0 dB SUTPUL LIM 128 dB FEAR SELECT LEFT ueri 1 tkHz gt 2 Figure 5 3 2 The unaided response Note Every time you leave the insertion gain screen to go to the menu or the target screen unaid ed will automatically be selected when you return to the insertion gain screen 5 3 3 Taking an aided response The aided response is the second step in the insertion gain procedure 1 2 Insert the aid into the ear making sure the probe tube remains in position Look at the label above F3 AIDED 1 should be highlighted assuming you followed the instructions from Section 5 3 2 Select the source type with F7 See Section 2 4 for an explanation of source types Set the source level by using the AMPLITUDE knob Press START STOP to start the measurement The aided response will appear on the small graph on the right and the insertion gain response will appear on the larger graph on the left If a composite Digital Speech or fast pure tone sweep is being used as the source type press START STOP to stop the measurement once it has stabilitized Real Ear Measurements 87 6 Press F3 to select Aided 2 and repeat steps 3 5 to perform another measurement A third aided response may be run in a similar fashion ANSI WEIGHT GAIN iNOISE RED i PREFERENCE MIC ON SMOOTHING LOG LEVELED iRMS SDURCE 78 dB iRMS OUT 77 5 i 9 dB QUTPUT LIM 128 dB
62. MPLITUDE FREQUENCY FEED Figure 1 5 1A FP40 Front Panel Function Buttons F1 F2 F3 F4 F5 F6 F7 F8 F9 CONTRAST POWER RESET DATA PRINT FU GRAPH LEER AMPLITUDE FREQUENCY Feb Figure 1 5 1B FP40 D Front Panel Function Buttons 10 FONIX FP40 Portable Hearing Aid Analyzer 1 5 2 Front Panel Buttons There are nine function key buttons in the top row of the FP40 front panel The function of each of these keys changes as you move from screen to screen on the FP40 The rest of the front panel buttons have specific functions that do not change with each new menu selection Feed Feeds the paper through the printer Print Produces a hard copy of the data and graphs displayed on the LCD screen or monitor screen Data Graph Allows the screen presentation to be switched from graph to data table and back again Start Stop Starts or continues or stops a measurement action depending on the particular measurement task When the instrument is running a continuous measure ment this button starts or freezes the measurement on the display START STOP is also used to activate a menu selection FP40s manufactured prior to 8 22 90 are marked START CONTINUE Level Along with START STOP button initiates a leveling action that takes a response measurement and develops a set of frequency response cor
63. R 5 243 Setting the debault target qo Meca dax xx OM RESET E ES gd R 5 2 4 Creating your own target lleeeeeeeeeeeeee e Ih 5 2 5 Modifying an existing target sees 5 3 Insertion Gain Measurements eee 5 3 1 Viewing the Insertion Gain screen 0 0 0 eee eee ee eee 5 3 2 Taking an unaided response eka ae OA ARAM 2a REGED SY 5 3 3 Taking an aided Tesponsey iat wee eka e ce tx eae ou ee Vu qued y Wee deen 5 3 4 Viewing insertion gain 1 Ih 5 3 5 Testing Open Fit Hearing Aids 6464 94 84 aks ee ee He ORE RO SEM 5 4 SPL Measurements including real ear DSL 0 c cece eee eee 5 4 1 Understanding the SPL approach suede e EX ade che p 5 4 2 Understanding the specifics of DSL 20 ee eee 5 4 3 Viewing the SPL SCreens 54 vea Bade ee A UR Mi a ee RC h 5 4 4 Taking the SPL measurements 00 c eee eee eee ene 5 5 Audibility Index Alou Pe eee Veet Ob ens ea e iee det ad ee eegy boone bs 5 5 1 Viewing the AI display urs s RS Sie aede eae en en hg atat at ba Owe le S inva 5 5 2 Performing AI measurements i2 2d x sar ae ae wae XN UE eu Radon 5 6 DSL Coupler Measurements o uvas cer eat de ORDER SORA EOM CT CRAS ede 5 6 1 Performing the RECD measurement l l eese 5 6 1 1 To perform the coupler measurement 4 4 2229 4c o Ra a 5 6 1 2 To perform the real ear measurement 0 00 eee eee eee 5 6 2 Performing coupler measurements to a DSL target
64. RVE 2 Make sure the source type and level are selected that you used for the forward measurement Press START STOP to start the measurement If you are using a Digital Speech or Composite source you can actually rotate the hearing aid while the measurement is running to deter mine the null spot of the directional microphones look for when the response drops the most Coupler Measurements 51 6 Press START STOP once the measurement has stabilized Compare the reverse measurement to the forward measurement to see the directional advantage that the aid provides Figure 3 6 3 Testing the reverse coupler response of a directional aid 3 7 The CIC Option The CIC Option is a way of performing a coupler test of a CIC hearing aid that more accurately reflects the real ear performance of that aid than a regular 2 cc coupler measurement It is not a way to check the manufacturing specifications of CIC hearing aid because those specifications are based upon 2 cc coupler measurements The CIC Option consists of a CIC coupler and software correction factors Both need to be used in order to correctly perform the measurement To measure a CIC hearing aid 1 wk d 52 Attach the CIC coupler to the CIC aid just as you would attach an HA 1 coupler to the aid and set the hearing aid up for testing as shown in Section 3 3 2 Press F1 to enter the General Setup Menu Use the AMPLITUDE and FREQUENCY knobs to select MAIN F2 or MAIN
65. T TYPE Press F1 to return to the real ear measurement screen FONIX FP40 Portable Hearing Aid Analyzer 5 9 Body CROS and BI CROS aids When using the FP40 probe with a Body aid CROS or BI CROS aid we suggest the following set ups and procedures But you certainly may experiment with different methods 5 9 1 Testing body aids The setup below is recommended for Body aids Follow normal Insertion Gain measurement proce dures REFERENCE MIC REFERENCE MIC PROBE MIC _ PENKER HEAD HIGH PROBE MIC ns ON EARHOOK SPEAKER FACING FORWARD BODY AID Figure 5 9 1 Real ear setup for testing body aids Real Ear Measurements 109 5 9 2 Testing CROS and BICROS aids Four Goals 5 9 2 1 Measure the head baffle effect 5 9 2 2 Measure how well the aid overcomes the head baffle effect 5 9 2 3 Measure the overall insertion gain 5 9 2 4 Measure the insertion loss to the good ear Each of these measurements uses the insertion gain measurement technique taking advantage of the fact that insertion gain is a difference curve between two measured curves usually the unaided and aided response The CROS and BICROS measurement techniques assign the label of unaided to one measurement and aided to another measurement Take all measurements in the Insertion Gain screen For measurements labeled unaided even if they aren t unaided follow the instructions in Section 5 3 2 or measurements labeled ai
66. a There may be a hearing aid vent leak Be sure to Fun Tak the vent b There may be a coupler vent leak c The 13 coupler tubing could be cracked or broken PROBE PROBLEMS 1 Probe Reference Mic does not Level Check the reference mic calibration Be sure the reference mic is properly plugged into the instrument Are all connections clean and tight Are the mic cables loose broken cut worn or frayed Is the Leveling signal coming out of the speaker If not check cable and connections Make sure the distance from the speaker to the ref mic during leveling is about 12 max 18 moanop 2 Cleaning probe tubes DO NOT REUSE probe tubes There is NO recommended cleaning procedure Germicidal solu tions can leave a residue inside the tubing which can cause test result errors DO NOT cut off any portion of the tube PRINTER PROBLEMS 1 Printer does not work a Check for a paper jam b Press the FEED Button c Make sure the print head lock down lever is released 2 Test results do not print on paper Make sure you are using thermal paper To check it take a hard object e g a car key and scratch the surface of the paper on both sides If a black mark appears it s thermal paper If not it s plain paper and will not work 144 FONIX FP40 Portable Hearing Aid Analyzer Appendix H Probe SPL Mode Description The Target IG is converted to the Target SPL in the following steps 1 Add the source le
67. a es 42 3 4 1 Choosing d source type aim ow kt edito 3 mem erae Se oe ee v Bde 42 3 4 2 Taking the measurement 0 2a dot x oro kr oe Sida a ONCE bat oe x Re 43 3 4 8 Viewing multiple measurements 0 eee eee eee 44 3 4 4 Taking a single frequency response ennn eee eee eee eee 44 3 4 5 Taking a three frequency average a sa acdc eO x dace OE EAS a 45 3 4 6 Viewing harmonic distortion 2 0 eee eee eee ene 3 4 7 Viewing battery current drain c6 ox e ES Re V cee RR Chor eed 3 4 8 Switching between gain and output 0 0 cee eee eee 3 4 9 Testing with the reference microphone 002 ee ee eee 3 5 DIST AMOS o uci dri tiro dow ct eros Bleck ud ata es the ioca Lat hain 3 5 1 Testing with Digital Speech 4 24 access cx RUN e d ROC d UE 3 5 2 Testing with the Composite Signal 0 0 eee eee eee 3 5 3 Testing with pure tone sweeps o desk hake p exe WA Sha ead e X Y a 3 6 Directional Hearing Aids 2 4 eeQecibk VERRE SETS A TARE ERR RO RSS 3 6 1 Preparing for the measurement 0 00 e eee eee eee 3 6 2 Taking the Forward Measurement llle 3 6 3 Taking the Reverse Measurement 2o i den x reat dore d Su Ihe GIG Optom sae sek datae a eq eser horti RR RE OY xe rin 3 8 The OES Optot i e Rx eke Reade es RAIN ede Tp Rare Oe BERS Chapter 4 Automated Test Sequences A I ANSI S3 22 2009 e Lee laa oce Bi atone aig chee nal ete Sante Tes S e We Ger
68. al the analyzer will perform one pure tone sweep measurement and stop automatically Otherwise wait for the measurement to stabilize and press START STOP to stop the measurement Coupler Measurements 43 3 4 3 Viewing multiple measurements It s often useful to view several different frequencies responses together on the same screen This is especially important when testing AGC hearing aids To do this use the Multi curve function To take multiple measurements 1 Look at the screen just above F2 and F3 If one of them is OFF MULTICRV press the corre sponding function button F2 or F3 to turn it on Skip to step 6 Otherwise proceed to step 2 for instructions on selecting Multi curve for F2 or F3 2 Press F1 to enter the General Setup Menu 3 Use the AMPLITUDE and FREQUENCY knobs to select MAIN F2 or MAIN F3 Press START STOP repeatedly to select MULTICRV 4 Press F1 to return to the Main Coupler Screen Press the function key F2 or F3 that says OFF MULTICRV to turn it on 6 Look at the screen In the upper right hand corner of the screen you will see a MULTICURVE REPORT box that will contain a legend for four curves This will give you data about each curve Press F6 to select the curve you want to use for the measurement 8 Follow the directions found in Section 3 4 2 for instructions on how to take a frequency response measurement 9 Repeat steps 6 8 to take up to four distinct measurements If you sele
69. allow you to get an accurate measurement before the aid goes into noise suppression mode 3 5 3 Testing with pure tone sweeps Unfortunately the only way to test a high end digital hearing aid using only a pure tone sweep is to put the aid in test mode and turn off the noise suppression feature of the hearing aid Most digital hearing aids have a way to do this in their programming software Contact your hearing aid manu facturer for details 3 6 Directional Hearing Aids When fitting a directional aid it is very important to make sure the microphones of the hearing aid are providing a directional benefit This is typically done by measuring the response of the hearing aid when the source is in front of the patient the forward response and the response of the hear ing aid when the source is behind the patient the reverse response When testing a directional aid in the sound chamber it is important to position the aid correctly in order to test the forward and reverse responses After the measurements have been completed compare the forward and reverse responses to each other Since the FP40 analyzer has a small sound chamber directional testing is best done with the cham ber in the upright position that is usually associated with real ear measurements The hearing aid connected to the coupler can positioned in front of the speaker on a stand or the back of a chair In a pinch the operator can stand to the side of the sound fi
70. am IG Insertion Gain or AI Audibility Index as the real ear measurement type Note You must select SPL here to create DSL tar gets Press F4 to enter the target screen Press F1 if necessary to select the desired ear Look at the label above F2 HTL should be highlighted If not push F2 to highlight HTL Real Ear Measurements 83 6 Use the FREQUENCY and AMPLITUDE knobs to input the hearing threshold levels for the selected ear The numerical values will appear in the HTL dB HL column in the table just to the right of the large graph As you enter the HTL values the smaller graph on the right side of the screen will be updated 7 Press F2 to highlight UCL if you would like to enter measured UCL values using the FREQUENCY and AMPLITUDE knobs If you would like the analyzer to predict these values from the client s threshold values skip this step 8 Press F3 to select the desired fitting rule 9 Press F6 to select the client s age if the client is a child If the client in an adult you can skip this step 10 Press F5 to generate the target Predicted UCL values are also generated if you have not entered any measured values Notes If you are only going to perform insertion gain measurements there is no need to input the UCL or age values They are not used in the insertion gain measurement method If you selected IG in Step 2 of the above instructions an insertion gain graph will appear on the left side of the ta
71. an t use it to view numerical data in an automated test sequence screen 2 8 External Sound Chamber or Speaker If you are in a noisy testing environment it might be useful to have an external sound chamber The 6040 sound chamber has better sound isolation than the standard internal sound chamber of the FP40 It also has a larger work space in the chamber which makes it easier to take aids in and out of the chamber When performing real ear measurements it s often more convenient to have an external speaker on a swing arm or a floor stand so you can move the speaker around the patient rather than the patient around the speaker This makes external speakers convenient for clinicians who don t move their analyzers around often 28 FONIX FP40 Portable Hearing Aid Analyzer To use an external sound chamber or an external speaker plug it into the jack labeled external speaker on the back of the FP40 Hint Whenever you have an external sound source plugged into the external speaker jack on the FP40 analyzer all sound from the analyzer goes to the external sound source no matter what oper ational screen you are viewing To avoid confusion unplug the external sound source when it s not in use 2 9 Printing You can print the screen display either by using the internal thermal printer or by using the External Printer Kit to connect an external printer In either case printing performs a screen dump of the current screen on
72. at 90 dB SPL 2 FULL ON NOISE GAIN RMS of response curve taken with the Composite signal at 60 dB SPL minus RMS of the input signal TARGET REF GAIN Calculated reference test gain ACTUAL REF GAIN Measured reference test gain CRV 5 9 Response curves at varying amplitudes Qv ur me o I O Input output measurement using Composite signal Oy ANS 3 42 1992 OUTEDT i NSPL9B 101 4 dBSPL FULL ON NOISE GAIN 29 2 dB G TARGET REF GAIN t 24 4 dB RCTURL REF GRIN 23 7 dB i TEST SPECIFICATIONS MEAS BANDWIDTH 200 8000 H ARESE E PSEUDD AHDOM T r COR E ANALYSIS METHOD SNGL CH FFT EILTER vro DTH a Hz i ANAL NOQUIE RECTANGULAR HEESUREMENT AVERAG ING FILTER SMOOTHING NONE SETTLING TIME 3 2 NOISE sad 68de 7008 BOdB 94dB 170 50 68 T8 SO BIN ISE Figure 4 4 3 ANSI 92 results 4 5 IEC The IEC International Electrotechnical Commission test sequence allows you to test hearing aids according to the IEC 118 7 standard the performance part of the IEC hearing aid standard as amended in 1994 4 5 1 Setting up the aid for testing When possible follow the procedure recommended by the hearing aid manufacturer when setting up the aid to perform an IEC test sequence Otherwise use the following guidelines e Set the controls of the aid to give the greatest possible output and gain For AGC aids this is usually accomplished by setting the aid for the minimum compression Set the aid
73. ate in a minute or two after pushing the OPERATE but ton A new fully charged battery will operate the instrument for approximately three hours The fuel gauge will be accurate plus and minus 20 There is no way to completely predict how long a charge will last because of all the variables of temperature battery condition power supply vari ance and load Close examination of the fuel gauge will reveal an arrow pointing to the right when the battery is being charged while an inverse arrow pointing to the left will be displayed when the battery is being discharged If the fuel gauge is halfway between E and E you have approximately half the battery time left and so on 32 FONIX FP40 Portable Hearing Aid Analyzer You may still be able to operate when the gauge shows empty but you are on reserve Battery oper ation shuts down when the battery voltage reaches approximately 10 volts If the software fails and the battery discharges to 9 2V there is an automatic hardware shutdown to protect the batteries Be sure to recharge the batteries within 24 hours if the instrument shuts down having reached 10V to prevent damage to the batteries Replace the batteries when you are dissatisfied with the longevity of the charge or when the bat tery does not hold a charge for more than an hour If you find it impossible to turn off the instrument using the OPERATE button in units with a Battery Option hold OPERATE down and then push RESET twi
74. ated target reference gain Press START STOP to complete the test sequence If you have chosen to measure an I O curve press the DATA GRAPH button to display the measurement 4 5 4 Viewing the results See Figure 4 5 4 for an example of IEC results iO 00 job Qs Ub VES OUS dpa cies Response curve at 60 dB SPL OSPL90 Measurement at the reference test gain of 90 dB SPL MAX Maximum frequency response measured and the frequency at which it occurred REFERENCE TEST GAIN CALCULATED REFERENCE TEST GAIN MEASURED TOTAL HARMONIC DISTORTION EQIV INPUT NOISE Equivalent input noise BATTERY Battery current drain OSPL90 Curve Response curve taken at 90 dB SPL 10 FOG 50 Full on gain response curve taken at 50 or 60 dB SPL 11 1 O curve Input output measurement taken at the reference test frequency Automated Test Sequences 69 JEC 118 7794 14mm MIC OUTPUT QUALITY INSPECTION METHOD SPL SPL9B 16080 Hz 126 9 dB aes MAX 1164 Hz 124 8 dB REFERENCE TEST GAIN CALCULATED 33 E dB MEASURED 8 de TOTAL Basalt OTSTORTION 1808 Hz 76 d EGIU INPUT NOISE 32 1 dB BATTERY 16808 Hz 66 dB or ZINC AIR 1 mA DSPL98 Fog Figure 4 5 4 IEC results 4 6 Profiler The Profiler is an automated test sequence designed to tell you all the important information about the hearing aid in a very short period of time It was originally modeled after the ANSI 92 test sequence but it was expande
75. ations there will be such a loud raspy hum that you will know immediately that it is unusable for this location Power lines and florescent lights can cause prob lems More subtle problems can be detected as you conduct the test Telecoil Testing 123 7 4 Testing 1 Use the amplitude knob to increase the level of the magnetic field If you are using the Composite signal the amplitude will be displayed in the Status box If you are using a pure tone signal the amplitude is displayed in the lower right corner of the screen When chang ing the field strength from 00 mA M to 10 mA M the amplitude of the response should increase by 10 dB if you are in an environment where it is possible to make valid telecoil measurements You are then above the background magnetic signal 2 Use a signal strength of 10 mA M to perform the telecoil test to the ANSI 87 standard Use a signal strength of 32 mA M to perform the telecoil test to the ANSI 96 standard The mea sured output will increase by 5 dB as you move from 10 to 18 to 32 to 56 mA M provided the orientation of the hearing aid remains constant These results are normal Results that vary from this norm may be due to environmental magnetic fields 3 Press START STOP to start a pure tone sweep or the Composite signal measurement Notes Use Noise Reduction when necessary to reduce the effects of stray magnetic fields Notice the position of the hearing aid that provides the highest amplitude It
76. ay In 1999 this VGA Option became a standard feature At the same time we introduced the Telecoil Option to allow telecoil testing It requires separate hardware such as the ANSI 87 telecoil board or the ANSI 96 telewand Introduction 1 Also in 1994 we introduced the FP40 D desk model analyzer This unit is always equipped with the real ear testing function In order to minimize costs the Battery Pack Option is not available on this unit and some accessories battery pills and monitor headset that are standard on the FP40 are optional with the FP40 D Since this unit does not have a lid a separate soft carrying case is avail able for those who want to carry the unit from place to place In 1996 we improved the sound chamber significantly The new sound box excludes much more ambient noise than the previous model did It was designed to be taken out of the module and placed on a short pole for use as a speaker for real ear measurements The speaker is then at a higher elevation than in the previous design and can be swiveled allowing easy positioning for real ear measurements 1 3 Features amp Options This section describes many of the different features and options available on the FP40 hearing aid analyzer 1 3 1 Composite Digital Speech Option In addition to pure tone tests the FP40 can be purchased with the Composite Option providing real time measurements of hearing aids The Composite and Digital Speech signals are compl
77. ce General Operation 33 Chapter 3 Coupler Measurements The Main Coupler Screen is the first operational screen you encounter when using the FP40 In it you can take coupler frequency response curves and view them in either dB GAIN or dB SPL By default the FP40 comes with three different types of pure tone sweeps that you can use as signals to generate the response curves You can also add the Composite and Digital Speech signals for test ing AGC and digital hearing aids 3 1 The Main Coupler Screen The display of the Main Coupler Screen varies depending upon whether you have chosen a pure tone source available on all FP40 analyzers or a Composite Digital Speech source optional 3 1 1 Viewing a Pure tone display ia COUPLER im d STRT B dk LES Hr iG A LEVELED 5 ORG SURE 7O di vy y m rn ze nr p BAT 13 ZiHC BIR af m Figure 3 1 1 Pure tone coupler screen Display type dB GAIN or dB SPL Signal type Pure tone sweep type Amount of noise reduction used see Section 2 4 1 2 Status of reference microphone Leveling status Source level of signal used in graph 9o db DON CUTS ee coss EE ues Battery current drain only if turned on Coupler Measurements 35 3 1 2 Viewing a Composite display oe WEIGHT GAIN OISE RED TE T sacos MIC OFF LEUELED ORR SOURCE 78 dB RMS QUT 68 8 dB oce 13 ZINC AIR f mH Figure 3 1 2 Composite coupler screen
78. ct a curve that already contains a frequency response the old frequency response will be erased when you take a new response To turn off the display of a curve 1 Press F6 to select the desired curve 2 Press F7 to turn off the display of that curve This will not erase the curve 3 Press F7 to redisplay the curve To erase a curve There are two ways to erase a curve Press F8 This will erase all four curves in the Multi curve buffer Press F6 to select the desired curve and take a new measurement This will replace the old curve with the new curve 3 4 4 Taking a single frequency response 1 Look at the first line in the STATUS box in the Main Coupler Screen If it says PURE TONE or BURST skip to step 6 Otherwise proceed to step 2 44 FONIX FP40 Portable Hearing Aid Analyzer 9v ur Be Cms NS Press F1 to enter the General Setup Menu Select SOURCE with the AMPLITUDE and FREQUENCY knobs Press START STOP to select TONE Press F1 to return to the Main Coupler Screen Open the sound chamber and listen to the signal You will hear a continuous pure tone sig nal Close the sound chamber Look at the lower right side of the screen You will see a box listing the SOURCE FREQ and MIC GAIN or MIC SPL of the signal Adjust the amplitude and frequency of the signal using the AMPLITUDE and FREQUENCY knobs Watch the MIC GAIN or MIC SPL in the lower right side of the screen change as you adjust the amplitude
79. d in the creation of some high end digital hearing aids The nice thing about Digital Speech on the FP40 is that it works the same way as any other type of signal works You don t have to learn any new button pushes and you can treat the digital aid just as you would any other hearing aid In fact there s no reason that you can t use the Digital Speech signal for testing an analog hearing aid To use digital speech Follow the instructions from Section 3 4 1 to choose a Digital Speech source DIGSP ANSI or DIGSP ICRA and test the aid according to Section 3 4 2 You can present the signal to the aid as long as you need to without worrying about the aid going into its noise suppression mode To understand ICRA vs ANSI There are two Digital Speech signals available Digital Speech ICRA DIGSP ICRA and Digital Speech ANSI DIGSP ANSI They have different speech weightings DIGSP ANSI rolls off the high frequencies of the broadband signal at the same rate as the Composite Signal DIGSP ICRA rolls off the high frequencies of the broadband signal more quickly Figure 3 5 1 shows a comparison of the two speech spectra OUTPUT SPL dB 2 E ERE 5500 EHE mc ofk EN LBISE EOR 8 LIE ES ico does LEVELED i i RMS SOURCE 9a dB SQ eR ORMS QUT 88 2 dB MULTICURUE REPORT fA ug 1 kHz 2 Figure 3 5 1 Comparison of DIGSP ANSI CRV 1 and DIGSP ICRA CRV 2 3 5 2 Testing with the Composite Signal If
80. d screens to the FP40 we made the func tion of keys F1 through F9 vary depending upon the current screen and your current settings Here are three simple things to remember about function keys The function of the keys vary depending upon the current screen The labels above the keys always indicate the function of that key They are never labels for the current screen Small labels indicate the function key toggles a setting Large labels indicate the function key will take you to a different screen These three points are explained in more detail below Varying Function Keys The function of the keys vary depending upon the current screen There are nine function keys used on the FP40 to toggle common settings and switch between screens We ve tried to make the function of each key be as consistent as possible when you switch from screen to screen For example e F1 is generally the MENU key Pressing it will usually take you to the General Setup Menu F4 in the Main Coupler Screen will take you to an automated test sequence such as ANSI F4 in the ANSI Screen will exit you back to the Main Coupler Screen The function of each key for each screen is clearly labeled above the function key on the display Function Key Labels are NOT Screen Labels As mentioned above the function of each key is labeled on the display above the key This label always denotes the function of the key Function key labels are never labels for the
81. d the external printer in the General Setup Menu Choose 9600 19200 38400 or 57600 baud 2 9 4 Printing a label If a label is desired to identify the measurements taken you can toggle the creation of a label with all printouts by pressing the F9 buton in most screens Here is a sample label CATE MODEL SERIAL OWNERS m mane e mamae a ae COMMENTS ACME HEARING AID COMPANY 555 1248 Figure 2 9 4 Label General Operation 31 2 10 The Opening Screen The Opening Screen of the FP40 Figure 2 10 contains some useful information including Software version of your analyzer Option code of your analyzer RS232 availability Frye Electronics contact information In the Opening Screen you can turn on and off the screensaver and switch from LCD to VGA dis play mode The screensaver turns off the LCD backlighting if the unit hasn t been used in 15 min utes You can deactivate it by pressing any key FONIX FP4B SOFTWARE VERSION 3 62E BSGFAIGS COPYRIGHT 2601 FRYE ELECTRONICS INC RS232 AVAILABLE FRYE ELECTRONICS INC TIGARD OREGON USA 97281 3391 PHOHE 5835 5628 2722 1 860 547 8269 FAX 383 0639 6128 PRESS START TO BEGIH Figure 2 10 Opening Screen of the FP40 2 11 The Battery Option not available on FP40 D FP40s that have a battery pack will have a fuel gauge on the main display reporting the state of charge of the battery The reading on the fuel gauge will be accur
82. d the test to also include the most useful measurements from ANSI 87 96 This gives you a complete picture of the hearing aid allowing you to quickly determine whether the aid is in need of replacement or repair or whether it has been programmed correctly The Profiler is run at the normal user settings for almost all the measurements eliminating the time and effort required to put the aid in test mode 4 6 1 Setting up for the test To enter the Profiler screen 1 5 6 From the Main Coupler Screen look at the FP40 s display above the F4 function key If it says PROF skip to step 6 Press F1 Menu Use the AMPLITUDE and FREQUENCY knobs to select MAIN F4 under FUNCTION KEY DEFIN Press START STOP to choose PROE This will let you use the F4 function key to enter the Profiler screen from the Main Coupler Screen Press F1 to return to the Main Coupler Screen Press F4 to enter the Profiler screen To change the Profiler s settings 1 Press F2 to choose the type of source signal used for the speech curves You have a choice of Composite COMP Digital Speech ICRA DSPI and Digital Speech ANSI DSPA 2 If you have chosen DSPA or DSPI in step 1 select the length of time each speech curve will be presented with F3 3 Select the type of equivalent input noise measurement taken with F5 The HFA SPA IEC selections use a three frequency average to obtain the EIN RMS uses a root mean square average to take
83. ded even if they aren t aided follow the instructions in Section 5 3 3 5 9 2 1 Head Baffle Effect CROS or BI CROS A Unaided Real Ear response on bad ear side Set up the FP40 analyzer as follows System UNLEVELED Reference microphone OFF Unaided CUSTOM Probe microphone over the bad ear tube jutting just slightly forward of pinna Loudspeaker at 90 12 inches from bad ear B Aided Real Ear response on good ear side Same setup as A except Probe microphone over the good ear The difference curve labeled Insertion Gain on the screen shows the attenuation of sound arriving at the good ear from the bad ear side Since this measurement excludes the external ear differences across individuals should be minimal Note Although the above two measurements calls for the FP40 to be UNLEVELED with the reference micro GOOD BAD EAR EAR 12 b SPEAKER PROBE MIC GOOD BAD EAR EAR 12 A SPEAKER PROBE MIC phone OFE the rest of the measurements in this section call for the FP40 to be LEVELED with the reference microphone ON 110 FONIX FP40 Portable Hearing Aid Analyzer 5 9 2 2 How Well the Aid Overcomes the Head Baffle Effect CROS A Unaided Measurement of good ear canal baffled by head Set up the FP40 analyzer as follows Reference microphone ON Sound field LEVELED GOOD BAD Unaided CUSTOM EAR EAR Reference microphone over pinna of bad ear acie Probe micro
84. der gor ee MEG Io T C OI e Feo 6 1 4 3 Real Ear AcCessotleS 4 22 dee EROR CHOCR due DOR EGO ECRIRE ERI AERA 8 L5 Layout SXCODETOlS us s soe sey p aha p hac eoe bara roe HS Wak woe Re aw eR 10 1 5 1 LCD Liquid Crystal Display 23 4 dss 43 Wa 4 B54 ERR REPE 10 1 5 2 Front Panel Buttons sc os ces Ba ee Ae ae eas FS ee ee Se en eee 11 1 5 3 Front Panel Lamps v2 ca BAe UA HS els gat ade ik ieu eM Gig BS 11 1 5 4 Front Panel Knobs ici2bzx 4 ewe ey REC XGUCENOS AAR ERO RANA WX ROSA 12 1 5 5 Rear Panel Controls ioo assed um av te Oe bales OP du Pade 12 1 5 6 Right Side Mounted Jack and Module 0 0 00 e eee eee eee 13 1 5 7 Sound Chamber Mounted Jacks and Controls 0 45 13 1 5 8 Top of Instrument Printer ege x ROO NC T RC OE USER eR 13 DIO BPAD OOEUDSN S oid S edeiwd ut aio edes Sq ROR CES dide obtulit dul th RO APER 14 1 6 1 Setting up the instrument 3 dx du xn Sa hE oe ec eor dL A aas A a 14 1 6 2 Connecting equipment sco du aK Ss eee CEU Sra maa d iR 14 1 6 3 Connecting the Ime cord u exea mest CR E Dee RC ROC RR 15 1 7 Mis ellaneols 2324 pana aa EUER ae eh ee ene ena RAS E AERE RA ELE 15 1 7 1 Servicing Your BPAQ Ls zen eee p mee etn Ae poer ae 15 1 7 2 Cleaning the FP40 Display 44 9 aang xS E WX ee e ro Pro PRT amp 15 1 7 3 Emergency Shutdown es deas ue e XRPXEWERAEES CORE AN S dae RR 16 1 7 4 Warranty 4 259242 ee mated Ee vu BAG ea ee ons 16 Chapter 2 General Operation 2 1 Screen Navigation sce er
85. drum When measuring with a probe microphone you will know what is happening in the real ear The probe microphone can also be used as a reference microphone while making coupler measure ments Target 2 cc Prescription The Target 2 cc screen on the FP40 converts real ear targets to coupler targets It can be used for ordering hearing aids from a manufacturer and it can be used for adjusting the hearing aid to tar get when a real ear measurement isn t possible Further refinements of the coupler target are pos sible using a measured real ear to coupler difference RECD measurement This is explained in more detail in Chapter 5 1 3 3 External Video Monitor In September 1994 the VGA Color Option was introduced on the FP40 This allowed the FP40 to be hooked up to an external video monitor In 1999 we made this a standard feature When the VGA display mode is chosen the LCD is blanked When purchasing a VGA monitor for your FP40 it is recommended that you get one with a 0 31 or 0 28mm dot pitch so that you get the resolution needed to take full advantage of the FP40 video resolution 1 3 4 Battery Pack Option Some users may find it convenient to operate their unit away from electrical outlets These users can order the Battery Pack Option which will operate on its rechargeable batteries for up to three hours Not available on the FP40 D Introduction 3 1 3 5 ID Option The ID Option personalizes the printout strips
86. dw IE bee ae 149 Appendix J Battery Simulator Impedances 0 eee eee eee eee 151 viii If you are located in the European Union please report all safety related concerns to our autho rized representative Siemens Hearing Instruments Alexandra House Newton Road Manor Royal Crawley West Sussex RH109TT England Otherwise please report all safety related concerns to Frye electronics Inc PO Box 23391 Tigard OR 97281 3391 USA IS 13485 Frye Electronics is a Registered Firm of British Standards Institution and OQ we conform tothe ISO 13485 standard FM 77405 Chapter 1 Introduction 1 1 Description Hearing aid analyzers are designed to give the user accurate information on how much amplifica tion the aid provides which frequencies it amplifies how loud it can get and how much distortion and noise are present Information is displayed in both graphs and in number tables and can be printed as desired The FP40 Hearing Aid Analyzer is the third generation of portable analyzers manufactured by Frye Electronics It incorporates a tilt up wide angle LCD liquid crystal display a quiet fast thermal printer and a convenient optional battery pack for testing in places where it is not convenient to use electrical outlets The lid holding accessories comes off so that the unit looks like a desk model in your office The following test sequences are currently available on the FP40 ANSI American National Sta
87. e 1 Place the probe calibration adapter in the 1 to 14 mm adapter as show in Figure B 3 2 Put the probe tube in the adapter pushing it completely through as shown in Figure B 4 Proceed as in Fig B 1 except observe the measured output for the probe microphone and adjust the calibration at the control marked PROBE GAIN Figure B 3 Figure B 4 Compensating Probe Microphone to Reference Microphone Since it is not necessary to compensate the probe microphone often and an unintentional use of this function could cause measurement problems the compensation function is hidden under CAL MIC S To further insure that it is not enabled accidentally you must go to SETUP from the cou pler measurement mode not the probe mode 1 Make sure that REFERENCE MIC is ON under PROBE SETTINGS 2 Exit PROBE by pushing F5 3 Place Reference Microphone and Probe Microphone together in the sound chamber at the reference point See Figure 5 6 1 1A 4 Close the sound chamber lid Push F1 SETUP MENU 6 Push F4 CAL MIC S ul 130 FONIX FP40 Portable Hearing Aid Analyzer 7 PUSH F6 COMPEN compensate Probe When the signal stops the probe has been compensated and the compensation has been saved 8 To view the effects of compensation EXIT MENU adjust AMPLITUDE to 70 dB and push START Note You may want to view the uncompensated differences between the two microphones Follow instructions 1 7 above Interrupt the compensation
88. e Alternately hold the hearing aid in place while standing to the side of the sound field See Figure 3 6 2 Make sure you are in the Main Coupler screen 3 Make sure MULTICURVE is turned ON See Section 3 4 3 for details 50 Select a Composite or Digital Speech signal source if available Otherwise use the pure tone FAST signal See Section 3 4 1 for details FONIX FP40 Portable Hearing Aid Analyzer 5 Use the AMPLITUDE knob to select an appropriate source level Typically this measurement should be done so that it is above the noise floor of the testing environment but below the compression knee point of the aid if possible If you have a quiet testing environment use 50 dB SPL Noisier testing environments may require you to use a higher source level to get a good measurement Press START STOP to start the measurement Press it again to stop the measurement once it has stabilized Figure 3 6 2 Testing the forward coupler response of a directional aid 3 6 3 Taking the Reverse Measurement 1 Position the hearing aid so that it is faced away from the sound field speaker Different hear ing aids have different null points so you will want to adjust the positioning so that the sound field speaker is pointing towards what should be the null point of the directional aid See Figure 3 6 3 Make sure the aid is the same distance from the speaker that you used for the forward mea surement Press F6 to select CU
89. e DIR MOERS Ae ner 4 1 1 Setting up the aid for testing shou ea a ere ei RO ER Im ew EN gas 4 1 2 Setting up the analyzer for testing 2 4 6 4 aay od IGG head ERAGE ER 4 1 3 Running the test sequence cuu e use osx v xS PTOL EMI PRU s Al Ae Viewing the Tesults se ek uic hee dos ROC E due OO MU oa RO DEI RU HR 4 2 ANSIS3 22719 9 Gi ie S vov ORE FC let hata ENE ade Ghat aes te pee gra dogs 4 2 1 Setting up the aid for testing o4 vuv Ges 4S co dede e e RR EN Ea 4 22 Setting up the analyzer for testing io ces eee aan em eet eA Em d 4 2 3 Running the test Sequence oeste Sor aieo onde PLU cave d rd 4 2 4 Viewing the results ierra an dx iy Sa eoe VL ACER Qe OUR elei 42 3 ANSIE S3 22 1987 eSI eS eet en tator e WORT Beet in eis el whan Gide etd 4 3 1 Setting Up forthe testi cout SEA Rot Red dyes inu ea Rus 4 3 2 Running the test sequence ua exem se Ren aes Cota WER A PaaS 43 3 Viewing the TesuliSi du c ca oed dhs he eae oe WEG i eoe de OU AO EES pa us 44 ANSLS3 42 1992 mi id ise RH e E AR eM Fi IRE eM 4 4 1 Setting up for the testy uei ede x RE X OR OC RO Cn LR eo Oe FR xs 4 4 2 Running the test sequence 24 iege eR XC oe kG RA RC Ar RRS 4 4 3 Niewine the results da veo cee ad Veda x Es ese aye d EUR PERSA 4 5 TEC ein uses EMG Ux eer D e tac ve e xS ox ale eg Ue HIR IRI e ae ah UTE e S a 4 5 1 Setting up the aid for testing a 4 veto bs ee ee E RR IM Ads 4 5 2 Setting up the analyzer for testing 0 0 cece eee ee eee 4 5
90. e ER o RV e eR b 17 22 General Setup Menus s a veto RO ec se qe x afe ahi que NERIS RR Y eta 17 2 241 Making selectins euesden eiie eR EH EA Rd Medien MA a eM St 18 2 2 2 Saving Change o radeti arte hp dtr dota ed Stk eem wen dotado x 18 2 2 3 Switching between partial and full menus 200 18 2 3 Using Function Keys a oce ecg e RE ERA baies EPUM uei 19 2 3 HIDES o ru ee ee zoe sed EL eme Ue EE E eios deus 19 2 3 2 Customizing the function Keys uuo bag ded aee X eed ees 20 2 4 Source Types cerapan au bg Sane aree utei tdem unen 21 2 4 1 Understanding Pure tone signals ccc cece cece ee eect ences 21 2 4 1 1 Pure tone settings selle 22 DAD Noise Reduces ca hae P eh wet ata teo nm Pte coral Rehd 22 2 4L 3 Serine Lie ocio ated po xu HIER ue SUCRE b UM Kr n 22 2 4 1 4 Harmonic Distortion 0 0 00 eee eee eee ee eee 23 2 4 2 Understanding Composite signals llle 23 24 2 T IGRA VS ANSI oso tx ahs bid a Av og docs 23 21 2 2 Noise Reduction uuu cies eR oe HEREIN lue e kr OR lcs 24 2 4 2 3 Intermodulation Distortions x creek we uoce xU PO RR tae 24 2 4 2 4 Composite source levels du ext ug IRR eat cn e Ro M DO E en 25 2 5 Displas Modes s ose as als 2a Whaat sa qe oie Ak aL MED o tanh GE 26 2 6 Battery Current Drain 4 xau ROCK ninau RE OA NG AREER TEAR OER 26 2 7 Using the DATAODHELOBU s oh ec oth y Pa RR t Saee Pact RSA 28 2 8 External Sound Chamber or Speaker
91. e 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 5 1 2 76 FONIX FP40 Portable Hearing Aid Analyzer Reference Mic Reference Mic Probe Mic Probe Mic a Speaker Speaker 45 degrees 45 degrees Top View Front View Figure 5 1 2 1 Positioning of the sound field speaker for real ear measurements 5 1 2 2 To place the earhook and reference microphone 1 Place the wedge style earhook on the client s ear Alternately place an earhook without a wedge on the client s ear and place the Velcro headband around the client s head 2 Attach the reference microphone facing for ward on the wedge of the earhook directly above the ear to be tested The reference micro phone should be as close to the head as pos sible See Figure 5 1 2 2 3 Adjust the round Velcro pad on the wedge style earhook by turning it so that the inside pad fits firmly against the client s neck Figure 5 1 2 2 Placing the reference microphone Real Ear Measurements 77 5 1 2 3 To insert the probe tube There are several different methods used for properly inserting the probe tube Here are two easy Place an unattached probe tube on a flat surface along with the client
92. e screen 5 8 2 Smoothing Smoothing is a way of averaging measurement results to limit testing artifacts caused by environ mental noise The advantage of smoothing is that you will get a nicer looking curve that contains fewer spikes that could be the result of the testing environment and not the aid itself The disad vantage of smoothing is that it potentially gets rid of useful testing information To turn smoothing on off 1 Press F1 from a real ear measurement screen 2 Use the AMPLITUDE and FREQUENCY knobs to select SMOOTHING under PROBE settings 3 Press START STOP to toggle between ON and LOG 4 Press F1 to return to the real ear measurement screen Real Ear Measurements 107 5 8 3 Reset Level The reset level is the sound pressure level that the analyzer automatically returns to when the RESET button is pressed By default it is set to 70 dB SPL This is set in the Setup Menu under PROBE SETTINGS 5 8 4 Data Display It is often useful to look at the numerical data from real ear measurements The DATA GRAPH but ton is used for this purpose To select which curve is converted to numerical data 1 2 108 Press F1 to enter the Setup Menu from any of the real ear measurement screens Select DATA DISPLAY under PROBE settings using the AMPLITUDE and FREQUENCY knobs Use the START STOP button to select the curve you want to convert to its numerical data The selections available are dependent upon the TES
93. eaker only for monaural instruments and a 0 position for CROS and BI CROS instru ments CROS A Unaided Measurement of good ear GOOD BAD Set up the FP40 analyzer as follows EAR EAR Reference microphone ON Sound field LEVELED Reference microphone over pinna of bad ear Probe microphone inside unoccluded ear canal of PROBE MIC 42 REFERENCE MIC good ear Loudspeaker at 0 12 inches from bridge of nose mn B Aided Measurement of good ear SPEAKER Same setup as A except Aid in place in good ear and set to user gain The difference curve labeled Insertion Gain on the screen shows the overall benefit of inserting the hearing aid BI CROS A Unaided Measurement of better ear SLE PAR Set up the FP40 analyzer as follows Reference microphone ON Sound field LEVELED Unaided response CUSTOM PROBEMIC 12 REFERENCE MIC Reference microphone over pinna of bad ear Probe microphone inside unoccluded ear canal of bet BED free SPEAKER Loudspeaker at 0 12 inches from bridge of nose 112 FONIX FP40 Portable Hearing Aid Analyzer B Aided Measurement of better ear Same setup as A except Complete aid in place in better ear and set at use gain Both transmitters on The difference curve labeled Insertion Gain on the screen shows the overall benefit of inserting the hearing aid 5 9 2 4 Insertion Loss to the Good Ear CROS When a CROS aid has been prescribed
94. ects which would prevent the products from meeting these specifications for a period of one year from date of purchase Battery pills are warranted for thirty days because they are necessarily fragile and can be damaged by careless handling 16 FONIX FP40 Portable Hearing Aid Analyzer Chapter 2 General Operation This chapter discusses the general operation of the FP40 analyzer You will learn how to navigate through the different screens use the General Setup Menu and change the function keys to suit your purposes Other general operational topics will also be discussed such as source types battery pills printers and other topics 2 1 Screen Navigation You move through the different screens of the FP40 by using the function keys The function keys are the top row of buttons of the FP40 front panel labeled F1 through F9 Each button is labeled on the display screen just above the function keys For example in most screens F1 is labeled MENU This means that you get to the Menu by press ing F1 Hint Whenever a function key is labeled with large letters it is a navigational key That is pressing it will take you to a different screen 2 2 General Setup Menu In the General Setup Menu you can change most of the settings on the FP40 To enter the General Setup Menu press F1 from almost any screen oo Cn SETUP MENU GENERAL SETTINGS PURETOME SETTINGS COUPLER SETTINGS SOURCE DIGSP_ANSI RESET FREQ 1888Hz
95. eech press START STOP again when satisfied with measurement Press F6 to adjust the amplitude of the source if you are performing a DSL WDRC fitting Notice that the target changes as the source level changes Perform the coupler measure ments at several different amplitudes to make sure that the AGC circuits of the hearing aid are compressing properly with the measurement meeting the target at different amplitudes See Figure 5 6 2A FONIX FP40 Portable Hearing Aid Analyzer TARGET COUPLER GAIN EAR SLEFT AID TYPE BTE COUPLER HAZ FIT RULE DSI COMPR TH SOURCE DIGSP ANS 65_dB RECD MEASURED AGE 2 5 YEARS SOURCE TARGET 65 dB 25 8 Figure 5 6 2A Coupler gain measurement with a DSL target 11 Press F5 to enter SSPL MODE You should see a series of star symbols on the screen These symbols stand for the highest comfortable levels predicted for this patient Again make sure the RESER is set to zero 12 Press START STOP to take a pure tone 90 dB measurement If the resulting measurement is higher than the target symbols those sounds will be uncomfortable for the patient Try to adjust the aid so the measurement only reaches at or below those symbols See Figure 5 6 2B OUTPUT TARGET COUPLER SSPL pa Low cecW Wels e deo 9 o m ae LEFT ERR 180 Ro ucihc ue dou ne us Eae T COUPLER zT HAZ t FIT RULES 86 ie A osos s s os PE DSL MDRC a 7 SOURCE 98 dB 25 1 ckHz 2 Fi
96. eld and just hold the aid at a fixed dis tance from the speaker If you have the FP40 portable model without the real ear option you will need the microphone extension cord 072 0300 00 for the folowing procedure The reference microphone should be OFF for these measurements Coupler Measurements 49 3 6 1 Preparing for the measurement 1 2 Set up your analyzer so that the speaker is in the upright position See Section 5 1 1 2 Position the stand or chair you are going to use to set up the hearing aid If you are using a chair face the chair to the side so that the sound field will not bounce against the large flat surface of the back of the chair The testing surface should be about 12 inches from the speaker Use Fun Tak to affix the large measurement microphone to the testing surface If you are going to be holding the aid during the test then hold the measurement microphone about 12 inches from the speaker while standing to the side of the sound field See Figure 3 6 1 Push the LEVEL button on your analyzer from the coupler measurement screen This will level the sound field Attach the hearing aid to the coupler and insert the measurement microphone as usual You are now ready to test Figure 3 6 1 Preparing for a coupler directional measurement 3 6 2 Taking the Forward Measurement 1 Position the hearing aid on the testing surface so that it is facing forward Use Fun Tak to hold the assembly in plac
97. ements 81 SANITATION NOTICE DO NOT REUSE PROBE TUBES Use a new probe tube for each ear to prevent the pos sible spread of infection Sterilization of probe tubes is not possible and germicidal solutions can leave a residue inside the tubing which can result in errors Do not cut off any portion of the tube DO NOT REUSE INSERT EARPHONE EARTIPS Insert earphone eartips are used primarily for perform ing RECD and audiometric measurements Sterilization of these eartips is not possible When performing these measurements make sure to use a new ear tip for each patient FONIX FP40 Portable Hearing Aid Analyzer 1 kHz gt 2 Figure 5 2 1 The Target screen 1 80 0 OY ov cBO 9 de Insertion gain target graphical display Fitting rule used in generation of the target Chosen ear UCL status predicted or measured Age of client Frequency column HTL data for corresponding frequencies UCL data for corresponding frequencies UCLs can be predicted or measured Insertion gain target data DSL LIN and DSL WDRC targets not displayed in this column 10 HL graphical display for HTL and UCL data Note If DSL WDRC is the chosen fitting rule the compression threshold will also be displayed next to the UCL status at the top of the screen 5 2 2 Creating a target 1 2 Press F5 to enter the real ear measurement screen from the Main screen Press F2 if necessary to highlight SPL SPL o gr
98. ent in front of the sound field speaker as described in Section 5 1 2 1 2 Position the earhook and reference microphone as described in Section 5 1 2 2 3 Enter the real ear measurement screen by pressing F5 from the Coupler Screen 4 Press LEVEL and START STOP This will attempt to level the sound field speaker If leveling is achieved the word LEVELED will appear in the Status box See Figure 5 1 2 4 If level ing is not achieved the word UNLEVELED will appear in the Status box There is an intermediate stage where neither LEVELED or UNLEVELED appears Pushing the LEVEL and START button again will often produce the desired leveling The client must be in the same position for leveling and real ear testing Real Ear Measurements 79 OUTPUT SPL 1 CkHz 2 Figure 5 1 2 4 Leveling the sound field speaker 5 2 The Target Screen The Target screen is used to enter the patient s threshold and uncomfortable levels select a fitting rule and create a target You can modify most real ear targets in this screen to fit the specific needs of your client DSL targets cannot be modified 5 2 1 Viewing the target screen See Figure 5 2 1 for an example of the target screen If the target screen is entered while the real ear screen is in SPL display mode see Section 5 4 you will not see the insertion gain graph on the left side of the display 80 FONIX FP40 Portable Hearing Aid Analyzer WARNING Choose OUTPUT LIMITIN
99. es at the required test frequencies are the RECD values These RECD correction factors can be used for DSL and TARGET 2cc sections 7 7 1 7 7 3 calculations 136 FONIX FP40 Hearing Aid Analyzer Appendix E The FONIX CIC Option Background Zwislocki built an ear simulator coupler years ago to better approximate the real ears impedance vari ation with frequency The ear s volume appears to get larger at lower frequencies Mahlon Burkhard at Industrial Research Products agreed with this approach especially when they built the KEMAR and designed an ear simulator that had impedance changes that matched the Zwislocki figures This ear simulator was later standardized by the publication of American National Standards Association standard S3 25 Another ear simulator that has similar characteristics was introduced in Europe a few years later by Bruel and Kjaer and is characterized in the standard IEC 711 Frye Electronics introduced a slightly different approach in the 1980 s when it came out with the INSITU option and later the OES option for its 5500 Z Hearing Aid Analyzer Realizing that ear sim ulators which contain frequency sensitive elements are somewhat fragile and can be damaged as they are handled in every day use Frye made a coupler which it labeled the MZ for Modified Zwislocki This coupler had a central volume very similar to the standardized Zwislocki but had no frequency sensitive elements Instead an analyzer program wa
100. ex sig nals made up on 79 different frequencies presented simultaneously updating about once a second Besides giving instant results these test signals often provide more realistic test results of hearing aids than you can get using pure tone sweeps Aids with automatic gain control AGC technology can respond unexpectedly to pure tone sweeps providing more amplification in the low frequen cies than would occur in a real life situation This artifact of pure tone testing known as artificial blooming does not occur when a complex signal such as the composite signal is used Advanced digital hearing aids with noise suppression have different difficulties with testing These aids were designed to lower their gain when in the presence of a continuous sound Unfortunately this generally includes conventional test signals such as pure tone sweeps or the standard composite signal Digital Speech was developed as a way to test these advanced hearing aids Digital Speech is very similar to the composite signal except that instead of being a continuous signal it is an inter rupted signal that the aid responds to as it would respond to speech Digital Speech comes with two speech weightings ANSI and ICRA The ANSI speech weighting is from the ANSI S3 22 1992 standard it is the same weighting used by the standard Composite sig nal The ICRA speech weighing is from a CD of sounds from multiple languages developed by the International Col
101. for a particular test or type of hearing aid depends upon the signals you have available and the situation Here is a description of each of the source types and when you would want to use them 2 4 1 Understanding Pure tone signals A pure tone sweep is a test involving a progression of pure tone signals presented at a specified level When the sweep is complete the aid s frequency response at those frequencies is displayed on the graph or data column There are three types of pure tone signals normal fast and short NORMAL Contains 43 different frequencies and only does one sweep before ending the test FAST Contains 16 different frequencies and continually sweeps through them until you stop the test The fast sweep is meant to be used as a real time continuous signal convenient for use while adjusting hearing aids It is an alternative to the composite signal SHORT Contains 10 different frequencies and only does one sweep It is primarily used for testing loud levels in real ear measurements General Operation 21 2 4 1 1 Pure tone settings There are several different settings available in the General Setup Menu for pure tone signals Here is an explanation of those settings RESET FREQ The frequency the analyzer returns to when RESET is pressed NOISE REDUC The amount of noise reduction used in pure tone measurements See Section 2 4 1 2 SETTL TIME The amount of time each tone is presented before the measure
102. for the widest frequency response range Make sure the gain control of the aid is full on Automated Test Sequences 67 Follow the instructions from Section 3 3 to set up the aid in the test box for testing 4 5 2 Setting up the analyzer for testing To enter the IEC screen I 5 6 From the Main Coupler Screen look at the FP40 s display above the F4 function key If it says TEC skip to step 6 Press F1 Menu Use the AMPLITUDE and FREQUENCY knobs to select MAIN F4 under FUNCTION KEY DEFIN Press START STOP to choose IEC This will let you use the F4 function key to enter the IEC screen from the Main Coupler Screen Press F1 to return to the Main Coupler Screen Press F4 to enter the IEC screen To change IEC settings 1 gx gv xe te 7 68 Press F2 to choose the source level for full on gain measurements and whether or not you would like to take an I O measurement type of aid you are testing The selections are AGC 50 LINEAR 50 LINEAR 60 Choose 60 for most linear aids Choose 50 for high gain linear aids Choose I O 60 for AGC aids with the AGC circuit disabled Choose I O 50 for most AGC aids Note If you are testing a digital aid you should usually select I O 50 for this setting However ask the hearing aid manufacturer for guidance Press F3 to set the reference test frequency If possible use the frequency recommended by the manufacturer Otherwise use 2500 Hz for hig
103. get Spectrum Analysis 119 Chapter 7 Telecoil Testing Telecoil testing is available on serial number 940000 and above manufactured in September 1994 and later Testing with the Telewand is available with software version 3 60 and above 7 1 Setup with the Telecoil Board 1 Set up the hearing aid in the usual way by connecting it to the correct coupler and insert the test microphone You may use either a normal hearing aid battery or a battery substitution pill to power the aid 2 Place the telecoil board close to the FP40 as shown in Figure 7 1A EXTERNAL SPEAKER TELECOIL BOARD Figure 7 1A Telecoil setup 3 Connect the telecoil to the back of the FP40 at the jack marked external speaker 4 Press F1 MENU from the Main Coupler screen in order to enter the Setup Menu 5 Use the AMPLITUDE and FREQUENCY knobs to select MAIN F2 under FUNCTION KEY DEFIN 6 Press START STOP repeatedly to select TELECOIL Telecoil Testing 121 Press F1 to return to the Main Coupler screen Press F2 to turn ON the telecoil feature Orient the hearing aid on the telecoil board for the maximum output If you re using the Composite signal you will have to press START STOP to start the test signal Figure 7 1B shows various positions that could be tried Notice that the hearing aid must be at the center of the board Figure 7 1B Orienting hearing aid for maximum output 7 2 Setup with the Telewand
104. gure 5 6 2B SSPL measurement with DSL predicted upper limits of comfort 5 7 Coupler prescription non DSL The object of the Target 2 cc screen is to prescribe a hearing aid using audiogram information a fitting formula the choice of styles of hearing aids age and RECD information All of these factors are used to calculate the 2 cc target coupler that can be sent to a manufacturer or that can be used to set the full on gain of a hearing aid in the sound chamber UCL data entered or generated in the Target screen is used to generate a corresponding SSPL90 prescription Real Ear Measurements 101 If the FP40 has the OES Option it is also possible to make a prescription that uses the modified Zwislocki MZ couplers 5 7 1 Viewing the Target 2 cc screen Figure 5 7 1 contains a picture of the Target 2 cc screen 1 10 Age of client 11 Instructions for performing 2 cc target measurements Selected aid type Selected coupler Signal source type Signal source amplitude Status of RECD BO OR ep gx OTE ee eps oa Gain graph containing the 2 cc target including the calculated target and modified target if Status of unaided response used to make the 2 cc conversion Note Once a measurement is made the modification box will disappear from the screen Figure 5 7 1 Target 2 cc screen 102 TARGET COUPLER F 0 G EAR LEFT AID TYPE BTE 3 COUPLER HAZ UNAIDED AUG FIT RULES
105. h frequency emphasis aids and 1600 Hz for all other aids Press F5 to select the harmonic distortion test frequency Press F6 to select the noise reduction used to take the measurements Press F7 to select the battery type Press F8 to select whether or not you want to perform an equivalent input noise EQIN also known as EIN measurement Note The equivalent input noise measurement is difficult without a very quiet environment especially with low gain aids Decide whether you want to test with or without the reference microphone See Section 3 4 9 for more information FONIX FP40 Portable Hearing Aid Analyzer 4 5 3 Running the test sequence 1 2 3 4 5 m Level the sound chamber if necessary See Section 3 2 for details Set up the aid for testing See Section 4 5 1 Close the sound chamber Press START STOP when you are ready to begin the test Wait for several tests to be run The analyzer will pause after performing several measure ments in order for you to turn down the gain of the aid Open the sound chamber and adjust the gain control of the aid until the MEASURED gain matches the TARGET gain to within 1 dB when the sound chamber is closed Note If you prefer you can set the target reference gain to match the manufacturer s speci fications as the IEC 118 7 standards instructs instead of using the FP40 s calculated target value However we have never found any difficulties with using the FP40 s calcul
106. h it is not used by manufacturers to label hearing aids it can give you valuable information not present in the ANSI S3 22 labeling standard ANSI 92 is only available if you have the Composite Option on your analyzer ANSI 92 uses the Composite signal to run a family of frequency responses at different input levels The Composite signal is critical for accurate testing of non linear hearing aids because of a well known effect associated with pure tone sweeps known as artificial blooming When a pure tone sweep is presented to a non linear hearing aid the aid s AGC circuits can sometimes react by inflat ing their gain at low frequencies This can result in inaccurate frequency response curves This artificial blooming of the low frequencies does not occur when a broadband signal such as the Composite signal is used Automated Test Sequences 65 4 4 1 Setting up for the test Follow the instructions found in Section 4 2 1 for instructions on setting up the aid for testing To enter the ANSI 92 screen 1 6 From the Main Coupler Screen look at the FP40 s display above the F4 function key If it says AN92 skip to step 6 Press F1 Menu Use the AMPLITUDE and FREQUENCY knobs to select MAIN F4 under FUNCTION KEY DEFIN Press START STOP to choose AN92 This will let you use the F4 function key to enter the ANSI 92 screen from the Main Coupler Screen Press F1 to return to the Main Coupler Screen Press F4 to
107. he source should be above the noise floor of the room but as quiet as you can make it and still get accurate real ear measure ment The reason for this is that you don t want the aid to go into compression while you are trying to test the directionality characteristics If possible use a source of 50 dB SPL noisy test environments may force you to use a louder level 8 Turn the patient around so the speaker is pointed towards the null spot of the hearing aid For some aids this is 180 For other aids it might be a different angle Alternately if you are using an external speaker on a swing arm you can swing the speaker around to the back of the patient Maintain the distance from the patient and the speaker that you used for lev eling See Figure 5 11 1 114 FONIX FP40 Portable Hearing Aid Analyzer 9 Press START STOP to start the measurement While the measurement is running you may want to adjust the angle of the speaker or the position of the client to make sure the sound source is hitting the null position of the aid You are looking for the response with the least amount of amplification 10 Press START STOP to stop the measurement once it has stabilized The unaided response is now the reverse measurement of the directional aid Figure 5 11 1 Reverse measurement positioning for directional test 5 11 2 Forward Measurement 1 Move the patient and or speaker so that the speaker is positioned at a 0 azim
108. hen the sound chamber is closed Press START STOP to complete the test sequence 4 3 3 Viewing the results See Figure 4 3 3 for an example of ANSI 87 results SSPL90 Output measurement at 90 dB SPL 1 2 RESP50 or 60 Response measurement at 50 or 60 db SPL 3 4 NR Noise reduction used in tests SPA HFA Frequencies used for the three frequency average FONIX FP40 Portable Hearing Aid Analyzer MAX Maximum frequency response measured and the frequency at which it occurred SPA HFA SSPL90 Three frequency average of the OSPL90 curve SPA HFA FOG Three frequency average of a full on gain measurement at 50 or 60 dB SPL REF TEST GAIN The measured reference test gain EQ INP NOISE Equivalent input noise 80 200 p OOM 10 RESP LIMIT and F1 and F2 The response limit level and the two frequencies where the response curve crossed over this level 11 THD The total harmonic distortion measurements 12 BATTERY Battery current drain 13 I O CURVE Input output measurement at 2000 Hz 5SPL9B ANSI 53 22 8r AGC RUTPUT FEES HFA 1800 1600 2590 Hz SEL 4128 FEN a ge 8 2200 Hz i10 nA ha 1 88P E T as 1 2 1608 Hz 65 dB 2 EE RNC Q BATTERY 1 kHz amp 65 dB 2000H Bs Se 8 et 28 dB 25 1 kHz 2 675 ZINC RIR 4 6 mh 170 SB ea r 80 dBIN Figure 4 3 3 ANSI 87 results 4 4 ANSI 3 42 1992 The ANSI 92 test sequence is a series of tests designed for non linear hearing aids Althoug
109. hod for measuring the RECD is not consistent with the DSL definition of the RECD Part A The 2cc Coupler Measurement 1 Attach the BTE hearing aid to an HA 2 coupler 2 Make sure the FP40 is in the Gain mode then select a 60 dB input signal either pure tone normal sweep or composite 3 Measure the 2 cc gain 4 Press the DATA GRAPH button to convert the curve to data Print and save the results Part B The REAR measurement 1 Measure and mark the probe tube depth Adults 25 30 mm Children 10 15 mm 2 Position and setup the client just like a REAR test at a 45 degree angle and 12 from the speaker Place the probe tube in the ear and the reference mic above the ear 3 Attach a disposable earmold to the BTE hearing aid and place it in the client s ear with the probe tube in position like an AIDED REAR test Note Make sure the aid is OFE 4 Level After leveling is complete turn the aid ON Press F4 Target mode then press F1 to select right or left test ear then EXIT 6 Press F2 to select IG test adjust the AMPLITUDE knob to a 60 GB input signal either pure tone or composite then press F3 and measure the AIDED 1 7 Press the DATA GRAPH button to convert the curve to data 8 Print and save the results Custom RECD Test 135 Part C The RECD Calculation On a separate sheet of paper subtract the REAR measurements Part B from the 2cc coupler mea surements Part A The differenc
110. hting makes the shape of the pure tone and war ble curves conform to that of the composite signal The same target formulas that are used with the Insertion Gain program NAL 2 Berger POGO 1 2 Gain 1 3 Gain and 2 3 Gain are available for the SPL approach All targets are converted to real ear SPL by including the AIDED 2 source and the average unaided ear canal into the calculation Whenever you change the source amplitude of AIDED 2 the target will change The target is intended to be at the user s Most Comfortable Level The reference microphone is automatically disabled in the SPL screen Therefore no particular adjustment needs to be made to the FP40 analyzer to test open fit hearing aids 90 FONIX FP40 Portable Hearing Aid Analyzer 5 4 2 Understanding the specifics of DSL The Desired Sensation Level DSL method is a hearing aid selection and fitting approach with the goal of making amplified speech audible The desired sensation levels for amplified speech are determined at each frequency for all degrees of sensorineural hearing loss The DSL method is not an insertion gain formula approach i e NAL POGO but it does use probe microphone instrumen tation as well as 2 cc coupler measurements in the test box DSL was originally developed for use with children and later expanded to include adults In order to perform a DSL real ear fitting follow the general SPL instructions found in Section 5 4 4 Make sure to select DSL
111. ic and acoustic infor mation and to be able to do most of the fitting of the hearing aid in a sound chamber rather than in the real ear Nevertheless the DSL programming in the FP40 is found in the Probe sec tion Verification of the fitting is done whenever possible in the real ear The size of the ear canal a function of the age of the child affects the frequency response of the aid Therefore corrections are built into the FP40 target curves based on age These are in addition to the corrections for microphone placement that are determined by the type of hear ing aid Frye electronics has long had its own corrections for microphone placement The DSL corrections are used instead when the DSL formula is chosen so that the results are equivalent to those found in the DSL I O computer program If another formula is used our original cal culations are used If desired users may apply the DSL age corrections to the target coupler conversions that originated from existing insertion gain fitting formulas Sensation Level refers to an amount of sound above threshold Frequency specific target val ues or Desired Sensation Levels provide guidance in choosing and setting the hearing aid Research findings show that the required sensation levels for maximum speech discrimination vary with thresholds Adjustments are made to the formula to reduce the upward spread of masking from the lower frequencies Finally predictions of uncomfortable levels are
112. id fitting It also felt that the approach taken in the use of the MZ coupler has been well accepted by professionals throughout the world and that the new CIC coupler should use a similar approach with response corrections modified to take the smaller CIC volume into account The Basic Problem The ear is not a simple structure It is a biological coupling device that converts sound energy to nerve impulses It also has a pinna that helps to direct higher frequency sounds into the external canal The part of the structure we are concerned with is the external ear canal or cavity which is terminated by the TM The ear canal can be considered to be fairly rigid when it is compared to the TM In the lower frequencies below 2000 to 3000 Hz the frequency related changes in impedance that we see in an ear can be thought to be mostly caused by the TM When we reduce the volume The FONIX CIC Option 137 of the cavity between the hearing aid and the TM by moving the aid closer to it we should expect to see the TM play a more important part in determining the response of the aid For more shallow standard earmolds the volume of the central cavity of the ear reduces the effect of the TM s frequency impedance changes This is because the volume of the cavity is added to the equivalent volume of the TM If the cavity volume is large and does not change with frequency then the large changes in impedance of the TM are swamped by the large volume of the ear
113. ies above about 3000 Hz Knowing the physical volume of the occluded ear canal and its frequency response variations it is possible to calculate the equivalent volume of the TM itself at each frequency and to apply this fig ure to the response of the 0 25 cc cavity between the hearing aid and the TM When the calculated volume variation of the TM is applied to the smaller volume of the CIC cou pler the total response variation comes out to be from 8 6 dB at 200 Hz to 5 5 dB at 8000 Hz for a total variation of 14 1dB Summary Using the CIC coupler with its software option gives the dispenser an immediate idea of how much gain that this new type of hearing instrument is going to give the hearing impaired individual It is nice to see that the CIC hearing aid can really produce significant amounts of gain in spite of its apparently poor performance in the 2cc world of the ANSI standard test The user must remember that an actual ear may produce differences from the predicted values Acknowledgment Mead Killion Mahlon Burkhard and Elmer Carlson are to be thanked for helping assemble the data from which the CIC corrections were derived 138 FONIX FP40 Portable Hearing Aid Analyzer CIC CORRECTION FACTORS dB Hz dB Hz dB Hz dB Hz 8 7 200 0 95 2200 3 2 4200 4 54 6200 8 6 300 0 5 2300 3 3 4300 4 55 6300 8 7 400 0 2 2400 3 5 4400 4 6 6400 8 75 500 0 2500 3 6 4500 4 65 6500 9 600 0 3 2600 3 7 4600 4 7 6600 8 9 700 0 5 2
114. itly change it back or turn off the analyzer For example if you were to 1 Choose MULTICURVE for SETUP F2 2 Turn MULTICURVE ON using the F2 button in the General Setup Menu 3 Choose CIC for SETUP F2 then Multi Curve would remain ON in the Main Coupler Screen even though it would no longer be the selection for SETUP F2 F7 DEFINITION This selection is in a different section in the General Setup Menu than the previously described selections This is because MAIN F2 F4 and SETUP F2 F3 all affect the Main Coupler Screen F7 DEFINITION located in the PROBE SETTINGS section of the General Setup Menu affects the F7 key in the Main Probe Screen A setting of SOURC SEL will make F7 in the Main Probe Screen toggle between the different source types available on your FP40 This is handy when you re doing a real ear test and you need to be able to quickly switch your source type For example you may want to switch between a composite signal and a digital speech signal A setting of SNGL TONE allows you to present a single pure tone signal to the aid instead of running an entire pure tone sweep 2 4 Source Types There are two main types of sources available on the FP40 analyzer pure tone and composite Three kinds of pure tone sweeps come standard with the FP40 normal fast and short When you purchase the Composite Option you will receive the Composite Digital Speech ANSI and Digital Speech ICRA signals The type of source you should choose
115. k ii recessed channel slips over upright speaker post velcro interlocking stop plates Side view Top view Figure 5 1 1 2A Sound chamber sound field speaker Release the front spring catch of the sound chamber by pulling it forward Lift the test box up and forward to remove it from the compartment There will be a little resistance from the velcro on the bottom Install the test box speaker on the metal post Locate the metal post on the right side of the compartment Pull the far end of the post up and forward until it locks in the vertical position Open the test box and mount the speaker on the pole The recessed metal channel on the out side of the box slides over the upright pole See Figure 5 1 1 2B The speaker is now ready for real ear testing 74 FONIX FP40 Portable Hearing Aid Analyzer speaker jack recessed channel T i speaker post Figure 5 1 1 2B Upright sound field speaker Note Do not close the chamber while it is on the post In a closed position it may accidentally fall off You may find it most convenient to position the FP40 at one edge of a table If the client is seated at the side of the table the speaker can be rotated so that the correct angle for testing is very easily achieved See Figure 5 1 2 1 Replace the test box speaker when test is complete Remove the test box speaker from the post and close it The up
116. legium of Rehabilitative Audiology It rolls off the high frequencies more rapidly than the ANSI weighting 2 FONIX FP40 Portable Hearing Aid Analyzer The use of the Composite or Digital Speech signals can uncover the presence of intermodulation distortion in a hearing aid Intermodulation distortion is the distortion that results when two or more frequencies are delivered to the hearing aid simultaneously resulting in the addition of fre quencies to the output that were not present in the input In other words when you deliver a com plex signal to the hearing aid such as speech the aid provides unexpected amplification to some of the frequencies causing the entire signal to sound distorted Intermodulation distortion can be detected using the composite or digital speech signals and look ing for jagged peaks and valleys in the response curve The curve breaks up more and more as the amount of intermodulation distortion increases 1 3 2 Probe Option standard on the FP40 D See Chapter 5 for details The FP40 Hearing Aid Analyzer can be ordered with the Probe Option so that tests can be done on the hearing aid while it is in the client s ear Probe measurements are also known as real ear mea surements It is then possible to individualize the fitting of a hearing aid since a coupler measure ment can seldom tell the operator exactly what sound is received by the client Many factors affect the sound on its way to the ear
117. low 60 dB SPL showed arti ficially high EIN results This means that ANSI 03 EIN test results should be better lower for AGC aids 4 1 1 Setting up the aid for testing When possible follow the procedure recommended by the hearing aid manufacturer when setting up the aid to perform an ANSI test sequence Otherwise use the following guidelines Set the controls of the aid except the compression controls to give the greatest possible out put and gain Set the aid for the widest frequency response range Set AGC aids to achieve minimum possible compression Make sure the gain control of the aid is full on Follow the instructions from Section 3 3 to set up the aid in the test box for testing 4 1 2 Setting up the analyzer for testing To enter the ANSI 03 screen 1 From the Main Coupler Screen look at the FP40 s display above the F4 function key If it says ANO3 skip to step 6 2 Press F1 Menu 3 Use the AMPLITUDE and FREQUENCY knobs to select MAIN F4 under FUNCTION KEY DEFIN 4 Press START STOP to choose ANO3 This will let you use the F4 function key to enter the ANSI 03 screen from the Main Coupler Screen Press F1 to return to the Main Coupler Screen 6 Press F4 to enter the ANSI 03 screen 56 FONIX FP40 Portable Hearing Aid Analyzer To change the ANSI 03 settings 1 2 3 10 11 12 13 14 15 16 17 From the ANSI 03 screen press F1 to enter the General Set
118. made from threshold data The high level limits in DSL are not the traditional UCLs but are one standard deviation below They are designed to be at the upper limit of comfort when formulas other than DSL are chosen the SPL display in the FP40 s Probe Option reflects the traditional UCL numbers Two important considerations in prescribing WDRC hearing aids are the compression threshold and compression ratios The compression threshold should correspond to the hearing aid being fitted The DSL creators recommend setting the compression threshold at the lowest possible setting Compression ratio targets are given for each audiometric frequency This information can be used in selecting a hearing aid If all the compression ratios are very similar a single Erber NP amp Witt LH 1977 Effect of stimulus intensity on speech perception by deaf children Journal of Speech and Hearing Research 42 271 278 FONIX FP40 Portable Hearing Aid Analyzer 149 channel instrument can meet those targets If the compression ratio targets are very different in different frequency regions a dual channel or multi channel instrument may provide a bet ter fitting for the client When setting the aid the compression ratio should be set to match the average of the target compression ratios in each frequency band Warning If the prescribed compression ratio is greater than 4 1 a WDRC fitting may not be appropriate for this hearing loss In the DSL ap
119. ment is made See Section 2 4 1 3 AVG FREQS The frequencies used with the AVG function that averages the responses of three dif ferent frequencies Each frequency set is represented on the screen by the highest frequency in the set The sets are HFA High Frequency Average 1000 1600 2500 SPA Special Purpose Aids 800 1250 2000 SPA 1250 2000 3150 a 1600 2500 4000 i 2000 3150 5000 IEC HAIC 500 1000 2000 DISTORTION The type of harmonic distortion display DIST TYPE Type of harmonic distortion tested See Section 2 4 1 4 SWEEP TYPE Type of pure tone sweep used in measurements Choose NORMAL FAST or SHORT 2 4 1 2 Noise Reduction Noise reduction is used in noisy testing environments Pure tone noise reduction takes several mea surements at each frequency and averages those measurements together You can select the amount of measurements and averaging in the General Setup Menu in the PURETONE SETTINGS section under NOISE REDUC Larger noise reduction numbers lead to smoother curves but increase the amount of time it takes to complete a pure tone sweep 2 4 1 3 Settling Time When you are measuring with pure tone sweeps you are offered a choice of settling times By this we mean that the tone source will be continued for a chosen amount of time before the measure ment is made This choice is allowed because some hearing aid circuits take a longer time than oth ers to adjust to changes in a
120. mplitude or frequency If the measurement is made too quickly an arti fact in testing will be created If the measurement takes too long the test is longer than necessary 22 FONIX FP40 Portable Hearing Aid Analyzer In determining the length of time needed for the proper measurement a good rule is to use twice the published attack time of the hearing aid If you are unsure of the attack time you can experi ment with longer times and shorter times and see if there is any difference in the test results Linear aids can be tested very quickly so a delay of 20 mS is usually fine Other aids are quite variable 2 4 1 4 Harmonic Distortion Harmonic distortion occurs when a hearing aid clips the peak of a pure tone input signal resulting in artifacts at harmonics integer multiples of that input signal For example if you present a 500 Hz tone to the hearing aid distortion artifacts could occur at 1000 Hz and 1500 Hz The harmonic distortion measurement is expressed as the percentage of the power of these distor tion artifacts to the power of the input signal All hearing aids will have some amount of distortion Usually the strongest artifacts occur at the second and third harmonics of the frequency With the FP40 analyzer you can test the amount of distortion available in the second harmonics the third harmonics or both harmonics considered total harmonic distortion This is selectable in the General Setup Menu 2 4 2 Under
121. ndards Institute IEC International Electrotechnical Commission JIS Japanese Industrial Standard and ISI Indian Standards Institute Your choice of one of these is included in the stan dard price Additional test sequences can be included at a modest cost Instructions for the ANSI and IEC test sequences are found in Chapter 5 Instructions for the JIS automated test sequence are available upon request The FP40 comes standard with three types of pure tone sweeps normal fast and short The Composite Options adds three real time signals the Composite signal Digital Speech ANSI and Digital Speech ICRA These signals are described in more detail in Section 1 3 Indications for use The FONIX FP40 Hearing Aid Analyzer allows the user to test the characteristics of a hearing aid using coupler and optional real ear measurements These characteristics include Frequency response harmonic distortion equivalent input noise battery current drain and compression Coupler measurements are performed inside a sound chamber Real ear measurements are per formed with a small probe microphone inside the patient s ear This manual provides detailed instructions on the measurement capabilities and user interface of the FONIX FP40 1 2 Hardware History Here s some of the recent hardware changes to the FP40 In 1994 we introduced the VGA Option that allowed the FP40 to be hooked up to an external color video monitor for a large colorful displ
122. nents None of the ampli tudes individual frequency components will be as high as the amplitude of the overall signal This is particularly noticeable when you view the test signal in dB SPL because this allows you to see the actual power of each frequency component See Figure 2 4 2 4 as an example of this phe nomenon In this figure the displayed curve has a 70 dB SPL RMS amplitude Notice that the level at each frequency varies from 10 dB to 30 dB from the overall amplitude The amplitude differences in the individual components of the composite signal will be reflected in the frequency response of a hearing aid Keep this in mind when viewing results in dB SPL OUTPUT COMPOSITE ANS WE LGHT POUR iREFERENCE MIC OF v LEVELED iRMS SOURCE i 70 dE iRMS QUT 78 1 dB BAT 13 Ls i m 1 kHz 2 Figure 2 4 2 4 Composite signal with an amplitude of 70 dB SPL RMS General Operation 25 2 5 Display Mode Although the FP40 comes standard with an LCD screen it is easy to hook up an external monitor for a larger more colorful display To attach the video monitor Hook a standard computer monitor to the port labeled Video Monitor on the back of the FP40 analyzer To view with the video monitor Press F5 from the Opening Screen of the FP40 analyzer This is the screen that appears only when you first turn on the analyzer Highlight DISPLAY MODE in the General Setup Menu by using the Amplitude and
123. ng Directional Aids s o2 teein theca irada ennn a a REANHAEI PASA 114 5 11 1 Reverse Measurement 0 0 ce hs 114 5 11 2 Forward Measurement eee s 115 Chapter 6 Spectrum Analysis 5 L apectridm MOdes 2 u dde eco hom aite Su bank 9 ecd od ated tede ua erdt 117 6 2 Entering the Spectrum Mode 5c esee vue dea ene wk SETAE Serle ee REM 117 6 3 Using the SpectromaIDde canes etu dude Nueve Ege Ca e dur wq a a 117 Chapter 7 Telecoil Testing 7 1 Setup with the Telecoil Boatd osi esa eR ERO ER EN ok eA AREA RA ER 121 7 2 Setup with the Telewand aco cues dett ade a a Re Pob RO Uo Uem 122 7 3 Environmental Magnetic Fields kc canes daa ys ne bd we oda Ee be 123 JA TESEN Sa ci riana exui e ahaa mela MEE OI eig s tue dal 124 Appendices Appendix A Specifications 8 24 2 41 63 4 ERE YAR ER EX RR SERRA R A ERS 125 Appendix B Calibration sene supet Wan oe Cee oe ES PH ERR b pe waa tor aca 129 Appendix C History of Changes ico dudes e XA or ape ee o iS C oe b Ove a ESN 133 Appendix D Custom RECD Test exa e de hag NO Iob ROC Sn RO OCA I edad 135 Appendix E The FONIX CIC Option az xa elec e due lex X e o KO a 137 Appendix F Storage Compartments in the FP40 0 0 ee eee eee eee 141 Appendix G Troubleshooting Guide o5 s eos etic eG ake as ds e ER ONS O28 ees Ya 143 Appendix H Probe SPL Mode Description 2 cee eee ee eee eee 145 Appendix I DSL Programming Notes sii s40ce5 lt cede edad be bea
124. nobs Press F9 to select how the screen is printed before any measurements are taken FULL print shows both the unmodified target curve the modified target curve if applicable and the modification table PARTIAL only prints the modified target curve Several choices disappear after you push START to make the measurement Should you for any reason wish to return to the previous screen push F1 FOG MODE 5 7 8 Viewing the SSPL 90 screen Figure 5 7 3 contains a picture of the SSPL 90 screen 1 2 3 oO wv SPL graph containing UCL values converted to dB SPL Column of frequencies Column where you can enter modifications to the SPL values Numerical UCL dB SPL data Selected coupler Selected fitting rule Real Ear Measurements 103 7 Age of client 8 Instructions for performing the SSPL 90 measurement Note Once a measurement has been taken the modification table will disappear from the display kr TBRBET COUPLER SSPL9O GRE o oe e e sr or s cr s 5 P RIGHT BOR MOD COUP 116 dB EP 1167 118 COUPLER i HAL 14 iFIT RULE NHL 2 169 L ES z iN e TESS ASSO 188 98 fa Aoc OO EU rmehOwWa JUI ic Master eti Com co eor a 89 1 kHz gt 2 Figure 5 7 3 The SSPL 90 screen 5 7 4 Taking the SSPL 90 measurement This measurement is always made with a pure tone sweep in order to make sure the fitting is com fortable for the client even when pre
125. nter and the FP40 s LCD display it will print in the format shown on the LCD display Will your printer work Some external printers both black amp white and color may be used with the FP40 and FP40 D Both Epson nine pin dot matrix printers and HP printers which support HP PCL Hewlett Packard Printer Computer Language version 3 0 or higher are compatible To use these printers you must purchase 30 FONIX FP40 Portable Hearing Aid Analyzer the External Printer Package from Frye Electronics containing a custom cable PN 119 0312 00 a series to parallel converter and a printer cable The FP40 will work with all new HP LaserJet printers and with many Deskjet printers check lan guage specifications in the printer manual Also the Epson FX 870 FX 880 and FX 1170 printers are compatible If the printer uses PPA Printer Performance Architecture it will be incompatible with FONIX instruments Examples are the Deskjet printers from the 720 820 and 1000 series A list of compatible printers is maintained on our web site www frye com under the Support menu Some notes on using an external printer Although the FP40 has only one serial port it is possible to have both the external printer and a computer hooked up at the same time to the analyzer You will need a special Y adapter It is not possible to use the computer to control the FP40 while printing You can change the SPEED of the connection between the FP40 an
126. o customize the function of several keys This allows you to change the FP40 screen to fit your testing needs Most of these are set in the FUNCTION KEY DEFIN section of the General Setup Menu MAIN F2 amp MAIN F3 These settings change the function of F2 and F3 in the Main Coupler Screen Usually you can select from AVG GAIN MULTICURVE and TELECOIL These options are explained in Chapter 3 The available settings are dependent upon the options on your FP40 so you may have some additional functions available MAIN F4 This setting changes the automated coupler test sequence available from the Main Coupler Screen Depending upon the options you purchased with your FP40 you may have only one choice for this key or you may have multiple choices See Chapter 4 for more information on automated test sequences SETUP F2 amp SETUP F3 These selections allow you to customize the function of F2 and F3 in the General Setup Menu This allows you to adjust functions used in the Main Coupler Screen that you might not need to change often For instance if you always want to have Multi Curve turned on in the Main Coupler Screen you can have it set to ON in the General Setup Menu freeing up either F2 or F3 in the Main Coupler Screen for a more commonly changed function such as CIC 20 FONIX FP40 Portable Hearing Aid Analyzer Note If you toggle a function with SETUP F2 or SETUP F3 that function will remain in that set ting until you explic
127. of the aid until the MEASURED gain matches the TARGET gain to within 1 5 dB when the sound chamber is closed Press START STOP to resume testing The analyzer will pause again if you are performing a telecoil measurement and instruct you to put the aid in telecoil mode Do so Otherwise skip to step 13 Plug the Telewand into the External Speaker jack on the back of the FP40 and hold the wand over the aid as you would hold a telephone receiver to your ear That is for BTE aids hold the wand flat against the body of the aid For ITE ITC CIC aids hold the wand against the faceplate of the aid The aid should be positioned vertically as it would be worn in order to produce the best telecoil response Press START STOP to take the telecoil measurements Put the aid back into microphone mode when the analyzer instructs you to Unplug the telewand from the External Speaker jack on the back of the FP40 If you have set the aid type to AGC or ADAPTIVE as described in step 8 of Section 4 1 2 and if the SET AGC is ON as described in step 14 the analyzer will pause to allow you to adjust the AGC controls Set the compression to maximum or as recommended by the hearing aid manufacturer Otherwise wait for the test sequence to complete Press START STOP to complete the test sequence 4 1 4 Viewing the results See Figure 4 1 4 for an example of an ANSI 03 test sequence including the telecoil measurement SL Q Eod cow mon OSPL90 Out
128. on gain target 12 Graph containing unaided and aided gain responses LEVELED J E evs SOURCE 60 gee gt iBMS BUT 85 1 dB OUTPUT LIM 128 dE 5 ERR SELECT LEFT In 1 kHz 2 Figure 5 3 1 Insertion Gain display 5 3 2 Taking an unaided response RMS of the current curve Not available with pure tone source types The unaided response is the first step in the insertion gain measurement procedure 1 Enter the Probe Mode by either pressing F5 from the Main screen or F4 from the Target screen 2 Look at the label above F2 IG and UNAIDED should be selected If not press F2 3 Position the client in front of the sound field speaker insert the probe microphone and per form the leveling procedure This is described in Section 5 1 2 86 FONIX FP40 Portable Hearing Aid Analyzer 4 5 6 Select the desired source with F7 Use either NORM for a pure tone sweep or COMP for a composite signal Use the AMPLITUDE knob to select the desired amplitude Unaided measurements are usu ally made with 65 or 70 dB SPL Press START STOP to start the measurement If you are using a composite source press START STOP again when the measurement stabilizes to stop the measurement See Figure 5 3 2 The analyzer will automatically set itself up for an aided measurement To perform another unaided measurement press F2 to select UNAIDED again FANSI WEIGHT i INOTSE RED i REFERENCE MIC on i SMOOTH
129. p This will ensure that the pure tone signal is fully 90 dB SPL at each frequency not speech weighted and that the client will be subjected to the loud noise for only a short period of time 12 Use the AMPLITUDE knob to select the desired amplitude We recommend using 90 dB SPL as a loud test signal 13 Press START STOP to take the measurement If you are using a short pure tone signal as rec ommended the sweep will only be performed once you will not need to press START STOP again unless you want to repeat the measurement You now have a good picture of the hearing aid fitting and how the hearing aid responds to signals at soft speech medium speech and loud levels See Figure 5 4 4 Real Ear Measurements 93 OUTPU STATUS UNLEVELED RMS SOURCE 65 dB RM T 86 0 dB OUTPUT LIM 126 dB ERR SELECT RIGHT AGE 3 7 MONTH ENU ICMA 2 RGE XIT AIDED 2 COMPOSITE CLEAR H UNAIDED Hb T Ld E Fi F2 F3 F F5 NO GHN OFF SIG TYPE CURVES LABEL 4 FS F F8 F9 Figure 5 4 4 SPL screen displayed on an external monitor 5 5 Audibility Index AI The Audibility Index screen displays the audiogram target and aided response in dB HL on one display Technically speaking these aided responses should be called aided audiograms because they incorporate the insertion gain obtained by making unaided and aided measurements This insertion gain is then added to the unaided audiogram to obtain the curves shown on the HL dis play The A
130. phone inside unoccluded ear canal of good ear SPEAKER Loudspeaker at 90 12 inches from bad ear PROBE MIC REFERENCE MIC B Aided Measurement of good ear canal baffle overcome by aid Same setup as A except Aid in place in good ear and set to normal user gain The difference curve labeled Insertion Gain on the screen shows the benefit the aid gives for sound arriving from the bad side BI CROS A Unaided Measurement of better ear canal baffled by head Set up the FP40 analyzer as follows Reference microphone ON Sound field LEVELED BETTER BAD Unaided set to CUSTOM EAR EAT 12 Reference microphone over pinna of bad ear Probe microphone inside ear canal of better ear SPEAKER e Hearing aid in better ear on set at use gain Transmitter on bad side turned off PROBE MIC REFERENCE MIC Loudspeaker at 90 12 inches from bad ear B Aided Measurement of better ear canal baffle overcome by aid Same setup as A except Transmitter on bad side turned on Real Ear Measurements 111 The difference curve labeled Insertion Gain on the screen shows the benefit of adding the second microphone for sound arriving from the bad side 5 9 2 3 Overall Insertion Gain Note Since it has not been shown for CROS and BI CROS instruments that a 45 position of the loudspeaker improves the reliability of insertion gain measurements we recommend a 45 position of the loudsp
131. proach all measurements are referenced to Sound Pressure Level HL Hearing Level thresholds no matter how they are obtained are changed to real ear SPL Once the threshold is entered the next step can be to go to the SPL display in the Probe screen to show the client or parent where the thresholds are in relation to the normal speech spectrum The LTASS Long Term Average Speech Spectrum will be either the adult s or child s depend ing on the age selected The child s LTASS is based on Cornekussem Gagn amp Seewald Alternately the operator can go from the target screen to the target coupler gain screen The hearing aid prescription curve will be displayed there It is in this screen that a custom RECD Real Ear to Coupler Difference measurement can be made using an insert earphone to add to the validity of the prescription The hearing aid is now measured in the chamber at a range of amplitudes The operator can make adjustments and the aid can be re tested in the chamber Finally when possible the operator can return to the SPL screen in the Probe Option and vali date the fitting in the real ear The mid range target will be displayed on that screen Cornelisse LE Gagn JP amp Seewald RC 1991 Ear level recordings of the long term average spectrum of speech Ear amp Hearing 12 1 47 54 150 FONIX FP40 Portable Hearing Aid Analyzer Appendix J Battery Simulator Impedances FP40 Battery Simulator Settings Bat
132. process by pushing RESET shortly after you hear the tones Then follow instruction 8 above to view uncompensated differences Note If after Step 8 the differences between mics are unacceptable try the process again but level the instrument between steps 7 and 8 The compensation process can adjust for differences of up to 3 5 dB If the difference between the two microphones is more than 5 dB after calibration consult factory IF YOU PUSH RESET DURING THE COMPENSATION PROCESS TO SEE THE UNCOMPENSATED DIFFERENCES YOU HAVE REMOVED THE COMPENSATION IF YOU NOW WANT TO HAVE COMPENSATED MICROPHONES YOU MUST REDO THE COMPENSATION Calibration 131 Appendix C History of Changes VERSION 1 0 ORIGINAL RELEASE 3 90 VERSION 1 2 5 90 Added JIS Standard VERSION 1 3 8 90 Added ISI Standard CRT Option VERSION 2 0 3 91 Added Fast Sweep VERSION 2 1 2 92 Added New Multi Curve in Real Ear amp Coupler Target 2cc FOG amp SSPL90 Easy to read Double Size Characters Full amp Partial Menu Choices Probe Signal Selection F7 Definition VERSION 2 3 4 93 Added 40 dB Input Source K Amp Spectrum Analysis Mode Improved Video Display Format everything on one screen Target 2cc FOG vs Actual FOG Comparison in Test Box Equivalent Input Noise EIN Measurement VERSION 2 5 2 94 2 6 last version available for old CPU boards Added RS232 Computer Interface Laser Printer Interface CHAP amp HearWa
133. put measurement at 90 dB SPL RESP60 Response measurement at 60 db SPL at reference test gain SPLITS Telecoil response curve measurement NR Noise reduction used in tests SPA HFA Frequencies used for the three frequency average MAX Maximum frequency response measured and the frequency at which it occurred SPA HFA OSPL90 Three frequency average of the OSPL90 curve FONIX FP40 Portable Hearing Aid Analyzer 8 SPA HFA FOG Three frequency average of a full on gain measurement at 50 dB SPL 9 REFTG TARGET and MEASURED The calculated reference test gain and the actual measured reference test gain 10 EQ INP NOISE Equivalent input noise 11 RESP LIMIT and F1 and F2 The response limit level and the two frequencies where the response curve crossed over this level 12 THD The total harmonic distortion measurements 13 HFA SPLITS The three frequency average of the telecoil SPLITS curve 14 RSETS The difference between the high frequency average of the response curve and the SPLITS curve 15 BATTERY Battery current drain 16 I O CURVES Input output measurements at up to five different frequencies Hes 3 72 200 HF n l duis haa He poy ig E ow 7 FA isi db ce HFA FO m REFT E ow E 1 i L L x gi F aaa Figure 4 1 4 ANSI 03 results 4 2 ANSI S3 22 1996 Although the ANSI S3 22 was revised in 1996 the FDA did not adopt this new version of the stan dard until March 2000 As a
134. r screen When this message disappears the coupler measurement has been taken and stored into per manent memory Press F1 to exit the menu 5 6 1 2 To perform the real ear measurement 1 Bah TON Wi Bs IS 8 9 10 11 Plug a 50 ohm insert earphone into the external speaker jack on the back of the FP40 If you are using an insert earphone from an audiometer you may need to use an adapter Press F4 to enter Target screen from the Probe screen Press F7 to enter Target 2 cc screen Press F3 to enter RECD mode Press F3 to toggle MEASURED RECD Insert the probe microphone into the client s ear Insert the custom earmold or foam eartip coupled to the insert earphone into client s ear See Figure 5 6 1 2A Press START STOP to perform measurement Both the curve and the numerical data will appear on the screen See Figure 5 6 1 2B Unplug the insert earphone from the analyzer when done Press F1 to return to the Target 2 cc screen If you have previously performed the RECD and want to enter the data into the RECD screen with out taking the measurement again use the FREQUENCY and AMPLITUDE knobs 98 FONIX FP40 Portable Hearing Aid Analyzer Foam eartip Foam eartip i _ _ Probe mic Lapel clip a m Up External speaker jack Custom earmold Microphone jack Probe mic on earhook WITH CUSTOM EARMOLD Figure 5 6 1 2A Setup for real ear part of the RECD
135. re ment has stabilized 7 Look at the difference between AIDED 1 and AIDED 2 If there is no more than 2 dB of difference between AIDED 1 and AIDED 2 at any frequency you can perform real ear measurements using that particular model of open ear hearing aid without adjusting the hearing aid analyzer If the two measurements are different by 3 dB or greater at any frequency it is recommended to disable the reference microphone when performing REMs using this type of device To disable the reference microphone follow the instructions found in Step 4 above When performing a real ear measurement while the reference microphone is disabled it is par ticularly important to make sure the patient doesn t move after the sound field speaker has been leveled because the reference microphone will not be able to compensate for any changes in the patient s position Real Ear Measurements 89 5 4 SPL Measurements including real ear DSL The real ear SPL screen permits the user to view all the major components of the hearing loss and the hearing aid fitting on one SPL screen with real ear measurements The hearing thresholds and uncomfortable loudness levels which are generally measured in HL are converted to SPL Target insertion gains are also converted to dB SPL Provision is made to show three aided responses in SPL at three different source amplitude levels Having all this information in a common format pro vides a convenient way to vie
136. re Interface VERSION 3 02 10 94 Added New CPU VGA Color Option Telecoil Option Earlier FP40 FP40 D can be upgraded Interfaces with CHAP and HearCare a new office management software package VERSION 3 1 1 95 Added AI Audibility Index New Laser Printout format External Color Ink Jet Printer Interface VERSION 3 2 4 95 Added CIC and ANSI 92 VERSION 3 3 10 96 Added Real Ear SPL software for non linear hearing aids New sound chamber and probe speaker VERSION 3 4 6 97 Added DSL 4 1 Linear and WDRC VERSION 3 5 10 99 Added Digital speech testing and expanded DSL VERSION 3 6 4 00 Added ANSI 96 and Profiler automated test sequences History of Changes in the FP40 133 Appendix D Custom RECD Test There are two methods of getting Custom RECD measurements with the FP40 using the Probe Option One method uses a linear BTE hearing aid and the other uses an ER 3A Insert Earphone This appendix describes the BTE method The insert earphone method is described in Section 5 6 1 BTE RECD Method This simple method doesn t require any additional equipment A linear BTE hearing aid with a moderate amount of gain is all that is required The volume control should be taped in position so that it provides about 20 dB of gain Make sure that you go into the MENU F1 and change the DATA DISPLAY choice to AIDED REAR Follow the steps as outlined in Part A B and C Note The BTE met
137. read REFEENCE MIC ON in the STATUS box Figure 3 4 9A Test setup for BTE aid using 3 4 9B Test setup for ITE aid using reference microphone reference microphone 3 5 Digital Aids All digital aids can be tested but some of the high end models requires a little more thought and care these aids have a noise suppression or speech enhancement feature This noise sup pression feature not to be confused the automatic compression of AGC hearing aids checks if the sound going into the hearing aid is a continuous signal that could be regarded as noise If the aid decides that the sound is noise it lowers the gain at the corresponding frequencies Conventional testing techniques such as a pure tone sweep or a Composite signal can cause the high end digital aid to go into this noise suppression mode This means that the gain or output you see on the ana lyzer s display will not necessarily reflect the normal response of the aid to speech Coupler Measurements 47 3 5 1 Testing with Digital Speech To test digital aids with noise suppression we have taken our standard continuous Composite signal and interrupted it at intervals just long enough to trick the hearing aid into thinking it is hearing speech instead of noise This program is called Digital Speech and comes equipped with two dif ferent speech spectra the ANSI 3 42 spectrum that is similar to the Composite signal spectrum and the ICRA spectrum that was use
138. rections to adjust the signal so that it is at the correct level for each test frequency Reset Resets the test signal to the amplitude and frequency you have chosen in the SETUP MENU and interrupts current operation Operate Starts and terminates the measurement operation of the FP40 Use operate to turn the instrument on and off There is no operate button on the FP40 D 1 5 3 Front Panel Lamps Line Power Operate Introduction Signals that the FP40 is connected to the power line and that the main rear panel mounted power switch is switched on If the Battery Option is installed this lamp may also indicate that the battery is being charged When lighted signals that the instrument is active Not on the FP40 D 1 5 4 Front Panel Knobs Amplitude Frequency Controls the amplitude or loudness of the test signal Is also used to move the cursor up and down in making menu selections Controls the frequency of the test signal in pure tone mode Is also used to move the cursor left and right when making menu selections In the real ear target screen it selects the amplitude in the audiogram tables Contrast Control Controls the contrast of LCD display If no display appears check this control first EXTERNAL VIDEO MONITOR POWER ON OFF SPEAKER SERIAL DO NOT REMOVE INSTRUMENT COVER INTERFACE Q CAUTION ELECTRICAL SHOCK HAZARD HEADPHONES REFER SERVICE TO QUAL
139. ree versions of the same labeling standard See Section 4 1 4 2 and 4 3 for more information ACIC is ANSI 87 with the CIC correction factors It is meant to be used with the CIC coupler and is for informational pur poses only The ANSI S3 42 1992 is a voluntary standard for non linear hearing aids It uses the composite sig nal to take a series of frequency responses at different input levels so you can make sure the aid is compressing correctly It is not directly related to ANSI 03 ANSI 96 or ANSI 03 See Section 4 4 for more information The IEC JIS and ISI are automated test sequences designed for the international hearing aid industry IEC is used primarily in Europe JIS is used primarily in Japan and ISI is used primarily in India See Section 4 5 for more information on the IEC automated test sequence Instructions on the JIS and ISI test sequences are available upon request The Profiler was designed as a fast way of determining all the important characteristics of a hearing aid in a very short amount of time It is used to quickly identify aids that need repair or replace ment and to validate new hearing aid fittings See Section 4 6 for more information 4 1 ANSI 3 22 2003 The ANSI S3 22 standard is the FDAs hearing aid labeling standard All hearing aids sold in the United States must be labeled to this standard The ANSI 03 automated test sequence performs all the measurements specified in the 2003 revision of the s
140. response of the same insert earphone placed inside the client s ear Why would you want to take the RECD Well DSL was developed for fitting hearing aids on chil dren and as anyone who has fitted an aid on a child knows it is sometimes hard to make the infant or child sit still long enough to perform good real ear measurements on them So if you can just make them sit still long enough to get a real ear unaided response you can get the RECD and use it to convert real ear targets to coupler targets Then you can test the aid all you want in the coupler and send the child to stay with his parents in the waiting room while you program and test the hearing aid in the sound chamber If you have a really uncooperative patient you can even just rely on the average RECD for the child s age group and forgo any real ear measurement entirely Of course when the child gets old enough to sit still long enough to get a good real ear measurement real ear measurements are the way to go 96 FONIX FP40 Portable Hearing Aid Analyzer 5 6 1 1 To perform the coupler measurement The coupler measurement part of the RECD is saved into the analyzer s permanent memory until another measurement is stored on top of it This saves a lot of time because it means you only have to perform the real ear part of the RECD for each client instead of performing both the coupler and the real ear measurements Note Steps 1 7 are optional but good to do in order to get the
141. rget screen When you generate the target as described in Step 10 the insertion gain target will be displayed on that graph If you have selected the DSL WDRC fitting rule you can use F2 to select CT and the AMPLITUDE knob to modify the compression threshold status The compression threshold is displayed at the top middle part of the screen next to the UCL status The fitting rule NAL 2 is often referred to as NAL R in other hearing aid analysis systems It is sometimes useful to clear threshold values To do this use F2 to select HTL Next press F8 to clear the threshold values You can also use this method for clearing UCL values and tar gets It is possible to print the target screen with or without a label Use F9 to toggle whether or not you want any printouts to include a label 5 2 3 Setting the default target If you consistently use the same fitting rule you may set it as your analyzer s default To do this select the desired fitting rule with F3 in the Target screen Next press START STOP You will see a WAIT message appear on the screen momentarily When this message disappears the selected fit ting rule is stored as the default 84 FONIX FP40 Portable Hearing Aid Analyzer 5 2 4 Creating your own target Advanced users may want to be able to input their own targets without applying any particular fit ting rule To do this 1 Use F3 to select DIRECT 2 Press F5 This will clear any existing targets and put
142. right post is locked in place with a spring catch Pull the catch outward to release the post and return it to the horizontal position Make sure all cables in the compartment are put away so they will not interfere with replacing the test box Set the test box back in the compartment interlocking the back stop plates As you do this guide the speaker wire so it stays to the side of the test box not underneath it Press down on the front of the test box to snap the front catch in place Real Ear Measurements 75 5 1 1 3 To set up an external sound field speaker If you have a permanent location for your analyzer you may find it more convenient to use an external sound field speaker for your real ear measurements This external sound field speaker can be mounted on either a floor stand or a swing arm See Figure 5 1 1 3 for an example of the swing arm setup When performing real ear measurements plug in this sound field speaker to the jack on the back of the FP40 labeled External Speaker Figure 5 1 1 3 External speaker setup 5 1 2 Setting up the client for testing To set up the client for testing you need to position the client in relation to the sound field speaker place the earhook and the reference microphone appropriately insert the probe tube and level the sound field speaker 5 1 2 1 To position the sound field speaker The sound field speaker should be about 12 inches 30 cm from the surface of th
143. rinter Printer Door 7 Paper Release Lever Figure 1 5 8 Electronics Module Top View Introduction 1 6 FP40 Setup This section describes how to set up the FP40 analyzer and prepare it for testing 1 6 1 Setting up the instrument Unpack and locate all accessories in the lid FP40 in the boxes FP40 D Save the shipping box in case you need to send the unit in to us for repair or major upgrades Choose a location for the FP40 which is relatively free of ambient sounds and vibrations See Figure 1 5 5 for a drawing of the rear panel 1 6 2 Connecting equipment If you want to connect an external printer you must have the External Printer Kit This kit consists of a special serial to parallel converter a printer cable a couple connectors and an RJ11 cable See Figure 1 6 2 SERIAL TO PARALLEL CONVERTER SERIAL INTERFACE x Q ge Oo EXTERNAL PRINTER Figure 1 6 2 External printer setup 1 Make sure the FP40 is turned off Attach the connector labeled FP40 Printer to the serial interface connector on the back of the FP40 Attach the RJ11 cable to the FP40 printer connector Y Attach the connector labeled Printer to the other end of the RJ11 cable Attach the printer connector to the RS232 side of the serial to parallel converter Attach the printer cable to
144. rting the probe tube until that dip goes away See Figure 5 1 2 3B Hints To help keep the probe tube in place position the tube so that it runs through the tragal notch resting against the lower edge of the tragus If necessary reposition the body of the probe microphone lower on the Velcro button of the ear hanger If desired use surgical tape to hold the tube in position 78 FONIX FP40 Portable Hearing Aid Analyzer FC i iBMSI WEIGHT GAIN INOISE RED PREFERENCE MIC OH i SMOOTH ING LOG i LEVELED i iRMS SOURCE 58 dB RMS OUT 58 0 dB OUTPUT LIM 128 dB EAR SELECT LEFT METTE 1 kHz gt 2 8 Figure 5 1 2 3B Unaided response with correct insertion of the probe tube 5 1 2 4 To level the sound field Leveling is a process that takes into consideration all the inconsistencies in the sound field In order to get accurate measurements it is critical that the sound field is leveled for every patient and every ear The leveling process only uses the reference microphone placed above the client s ear It does not use the probe microphone so it doesn t matter whether you insert the probe tube before or after you level the sound field speaker If you have the Composite Option leveling is done with a flat weighted composite signal and takes just a few seconds If you don t have the Composite Option leveling is done with a pure tone sweep taking slightly longer than composite leveling l Position the cli
145. s F4 to enter the ANSI 96 screen To change the ANSI 96 settings 60 From the ANSI 96 screen press F1 to enter the General Setup Menu Use the AMPLITUDE and FREQUENCY knobs to select MENU TYPE Press START STOP to choose PARTIAL The menu will now only display the selections appli cable to ANSI 96 Use the AMPLITUDE and FREQUENCY knobs in conjunction with the START STOP button to choose the settings for NOISE REDUC SETTL TIME and AVG FREQS under PURETONE SETTINGS These settings are explained in Section 2 4 1 Use the AMPLITUDE and FREQUENCY knobs in conjunction with the START STOP button to select whether or not you will use the REFERENCE MIC for testing We generally recommend selecting OFE See Section 3 4 9 Use the AMPLITUDE and FREQUENCY knobs in conjunction with the START STOP button to select the type of battery pill used in the measurement This is used in testing battery current drain 7 Press F1 to return to the ANSI 96 screen Press F2 to choose the type of aid you are testing The selections are AGC ADAPTIVE AGC LINEAR 50 LINEAR 60 Choose LINEAR 60 for most linear aids Choose LINEAR 50 for high gain aids Choose AGC for most AGC aids Choose ADAPTIVE AGC if the aid has adaptive release times FONIX FP40 Portable Hearing Aid Analyzer 9 10 11 12 13 14 15 16 Use F5 to turn ON or OFF the telecoil measurement The ANSI 96 telecoil measurement req
146. s used with the coupler to apply correction factors to the measured curves from the hearing aid so that the output was very similar to that which would be obtained if the aid were tested on a standardized ear simulator as built by Knowles or B amp K These software corrections work well for most regions in the frequency response of the aid In low fre quency areas up to about 1500 Hz if the aid has a response peak that is influenced by the volume of the cavity the peak will be slightly higher in amplitude and slightly higher in frequency than that peak would be if the aid were measured in a standardized ear simulator The CIC hearing aid is not usually affected by this problem The Need for a CIC Coupler The introduction of the CIC hearing aids has made it desirable to be able to test them with a coupler that more closely approximates the actual volume and frequency response characteristics of the real ear The CIC aid fits so close to the tympanic membrane TM of the ear that the volume of the cavity is reduced greatly and the aid produces a significant amount more gain Further its response can be expected to be substantially influenced by the frequency dependent impedance variations of the TM Frye Electronics felt that the use of CIC coupler with a proper response correction would give better data to a hearing professional than the use of the standard 2cc coupler or even a Zwislocki ear simu lator when attempting to produce a good hearing a
147. sed an average RECD and an average REUR to generate the 2 cc target skip to step 6 3 Press F3 to enter the RECD screen and enter in the client s measured RECD F1 will return you to the Target 2 cc screen If you didn t perform an RECD measurement on the client skip this step 4 Press DATA to display the numeric curve data Use the FREQUENCY and AMPLITUDE knobs to modify the 2 cc target until it matches the target generated during your client s last visit 6 Press F6 to select the source level You should usually use 50 dB or 60 dB since these are the amplitudes the manufacturer would have used when testing the hearing aid 7 Place the newly ordered hearing aid in the test box and set it to full on gain 8 Press START STOP to take the coupler measurement 9 Adjust and modify the hearing aid to match as closely as possible the 2 cc target 10 Contact the client for a real ear fitting Note This test procedure can be used to compare a stock programmable or a client s old hearing aid against the prescribed 2 cc target Pascoe David P Clinical measurements of the auditory dynamic range and their relation to formulas for hearing aid gain Hearing Aid Fitting Theoretical and Practical Views Ed Janne Hartvig Jensen 13th Danavox Symposium 1988 Real Ear Measurements 105 5 7 6 Accounting for venting effects You can make 2 cc targets more accurate by modifying the target to account for venting effects Target
148. sely at the location of the hearing aid microphone ITE and Canal corrections are each the average of three measurements with three probe microphone locations at the surface of simulated hearing aid face plates 106 FONIX FP40 Portable Hearing Aid Analyzer 5 8 Miscellaneous This section describes a few real ear features accessible from the Setup Menu 5 8 1 Single frequency response In some cases it s useful to be able to evaluate the real ear response to a tone presented at a par ticular frequency The single tone measurement in the Probe screens is always warbled To do this 1 Enter the Probe mode by pressing F5 from the coupler screen 2 Set up the client for testing as described in Section 5 1 Make sure to level the sound field speaker 3 Press F1 to enter the Setup Menu 4 Use the AMPLITUDE and FREQUENCY knobs to select SOURCE in the upper left corner of the screen If you don t have the Composite Option you will not have this selection so skip to step 6 5 Press START STOP to select TONE 6 Use the AMPLITUDE and FREQUENCY knobs to select F7 DEFINITION in the PROBE SETTINGS 7 Press START STOP to toggle SINGLE TONE 8 Press F1 to return to the Probe mode 9 Press F7 to highlight SNGL TONE 10 Press START STOP to start the measurement 11 Use the AMPLITUDE and FREQUENCY knobs to make any desired adjustments to the tone The MIC SPL or MIC GAIN will be displayed in the lower right corner of th
149. sented with 90 dB SPL of sound at any frequency 1 Press F5 to enter the SSPL 90 screen See Figure 5 7 3 for a picture of this screen The stars on the graph correspond to the client s UCL values converted to dB SPL using David Pascoe s predictions 2 Make any desired modifications to the displayed UCL values using the FREQUENCY and AMPLITUDE knobs 3 Adjust the reserve gain if desired using the knobs 4 Put the aid in the sound chamber and prepare it for a sound chamber measurement Press START STOP to start the 90 dB pure tone sweep 104 FONIX FP40 Portable Hearing Aid Analyzer 5 7 5 Checking an aid against a prescription This procedure allows the operator to reenter data from the client s initial prescription FOG curve so that the actual custom hearing aid ordered can be compared and adjusted to the original FOG Curve when it is received and before the client is scheduled for a real ear fitting It is assumed that you have followed the instructions found in Section 5 7 2 and 5 7 4 to generate the client s initial prescription FOG and SSPL 90 curves ordered the custom hearing aid and saved this data in the client s file When the ordered hearing aid is received follow these steps to set up the comparison test proce dure 1 Follow the instructions from Section 5 2 to generate a target using the same fitting rule that you used in the previous prescription 2 Press F7 to enter the COUPLER Mode If you u
150. source types Real Ear Measurements 95 13 Output limit status 14 Selected ear 15 Graph containing unaided and aided gain response 5 5 2 Performing AI measurements Performing AI measurements is just like performing normal insertion gain measurements Follow the instructions in Section 5 3 2 and 5 3 3 Instead of choosing IG in step 2 of Section 5 3 2 use F2 to choose the AI display Alternately perform the insertion gain measurements as normal in the Insertion Gain display and then press F2 to switch to the AI display All measurements will be auto matically converted from insertion gain to dB HL 5 6 DSL Coupler Measurements Since the DSL fitting method is often used on small children who are hard to fit using conventional real ear testing methods often coupler measurements are performed to match corresponding cou pler targets If possible it is recommended to perform a real ear to coupler difference RECD measurement on the child in order to generate an accurate coupler target When it is not possible to perform a mea sured RECD an average RECD corresponding to the child s age can be used 5 6 1 Performing the RECD measurement RECD is the real ear to coupler difference the difference between the acoustical resonance of a 2 cc coupler and the acoustical resonance of a person s unaided ear canal It is calculated by subtracting the frequency response of an insert earphone inside a 2 cc coupler from the frequency
151. standing Composite signals There are three types of composite signals Composite Digital Speech ANSI Digital Speech ICRA The Composite signal is a continuous broadband signal containing 79 different frequencies pre sented simultaneously This makes it much faster than a pure tone because there is no waiting for a progression of tones to complete instead you get the entire frequency response instantly updating about twice a second The digital speech signals are interrupted versions of the Composite signal that are used for testing high end digital hearing aids Many high end digital aids though not all use a technology called speech enhancement or noise reduction These aids respond to any continuous signal as if it were noise and lower the gain at the offending frequencies Unfortunately these aids regard the Composite signal or pure tone sweeps as noise making them difficult to test using traditional meth ods The Digital Speech signals were developed as a way to test these high end hearing aids Instead of presenting a continuous signal they present an interrupted signal that the aid regards as speech instead of noise There are two varieties Digital Speech ANSI and Digital Speech ICRA 2 4 2 1 ICRA vs ANSI There are two types of Digital Speech signals Digital Speech ICRA and Digital Speech ANSI Both are interrupted composite signals for testing digital hearing aids They differ in the speech spectrum they use
152. t DISTORTION under PURE TONE SETTINGS 4 Press START STOP to toggle between displaying the harmonic distortion in bar format on the graph or table format next to the graph Use the AMPLITUDE to select DIST TYPE 6 Press START STOP to select the type of harmonic distortion measurement to make See Section 2 4 1 4 for more details 7 Press F1 to return to the Main Coupler Screen 8 Run a pure tone frequency response by following the directions found in Section 3 4 2 The harmonic distortion results will appear either as bars on the graph or as a separate table 3 4 7 Viewing battery current drain Follow the directions in Section 2 6 for instructions on turning on the battery drain display and selecting the appropriate battery pill You must use a composite or pure tone sweep source You must use a battery pill to view battery current drain 3 4 8 Switching between gain and output Look at the screen just above F2 and F3 If one of the function button labels reads ON GAIN or OFF GAIN press the corresponding function button F2 or F3 to toggle the selection This will switch between viewing the response graph in dB GAIN or dB SPL When you view the graph in dB GAIN you are looking at the difference between the input the source signal and the output measured by the analyzer s microphone This is nice because you are seeing only what the hearing aid is amplifying When you view the graph in dB SPL you are
153. t to perform an equivalent input noise EQIN also known as EIN measurement Note The equivalent input noise measurement is difficult without a very quiet environment especially with low gain aids Decide whether you want to test with or without the reference microphone See Section 3 4 9 for instructions on the reference microphone 4 3 2 Running the test sequence 1 2 3 4 5 8 Level the sound chamber if necessary See Section 3 2 for details Set up the aid for testing See Section 4 2 1 Close the sound chamber Press START STOP when you are ready to begin the test If you turned on the telecoil test a Plug the external telecoil board into the external speaker jack on the back of the FP40 b Set the aid to receive telecoil signals c Position the aid and coupler on the telecoil board so that the TCOIL reading on the display is as large as possible d Press START STOP to take the measurement e Return the aid and coupler assembly to the sound chamber and put the aid back to micro phone mode f Unplug the telecoil board g Press START STOP to resume the test Wait for several tests to be run For most linear aids the analyzer will pause after performing several measurements in order for you to turn down the gain of the aid If the analyzer pauses open the sound chamber and adjust the gain control of the aid until the HFA or SPA MEASURED gain matches the HFA or SPA TARGET gain to within 1 dB w
154. table Switch between viewing curves in output and gain Test with or without the reference microphone This section will tell you how to do all of these things 3 4 1 Choosing a source type The first step in taking a frequency response is to choose the signal you will be using as a source The sources available on the FP40 analyzer are described in Section 2 4 To select a pure tone source 1 2 42 Press FI MENU to enter the General Setup Menu If you have the Composite signal you will see the item SOURCE as the first item in the left column If you don t see this selection skip to step 3 a Select SOURCE with the FREQUENCY and AMPLITUDE knobs b Push START STOP to select TONE Select SWEEP TYPE with the FREQUENCY and AMPLITUDE knobs in the middle column of the screen See Figure 3 4 1 Select the desired pure tone sweep type using START STOP In general select NORM to per form a single sweep containing many frequencies Select FAST to perform continuous sweeps containing fewer frequencies Press F1 EXIT to return to the Main Coupler Screen FONIX FP40 Portable Hearing Aid Analyzer SETUP MENU GENERAL SETTINGS PURETOHE SETTINGS COUPLER SETTINGS SOURCE TONE PRESET FREQ 188BHz REFERENCE MIC OFF ib x PRESET LEVEL f dB HT H i LCD SE BATTERY DISP ON E S mS MENU TYPE PARTIAL BUS FREGS HEA 2500 BATTERY 13 ZINC RIR IPR PR INT INTERNHL TOT
155. tandard As of the publishing of this manual the FDA has indicated that it will publish this standard in the federal registry in Fall 2005 After this happens there will be a period of comment before the stan dard is officially adopted by the FDA and put into use When this occurs all newly designed hearing aids will be labeled to the 2003 standard It is not known at this time whether previously designed hearing aids will also be labeled to this standard Automated Test Sequences 55 Here are the major differences between ANSI 03 and ANSI 96 When you set up an AGC aid for an ANSI 03 test sequence you will start with its compression controls set to minimum with the compression knee point set as high as possible Just before the input output measurements the test sequence will pause to allow you to set the compres sion controls of the aid to maximum with the compression knee point set as low as possible In ANSI 96 AGC aids are tested with their compression controls set to maximum for all mea surements When you adjust the gain control of the hearing aid midway through the ANSI 03 automated test sequence the measured reference test gain value needs to be within 1 5 dB of the target value In ANSI 96 the measured valued needs to be instead of within 1 dB of the target value The EIN formula in ANSI 03 uses a 50 dB SPL input instead of the 60 dB SPL input used in ANSI 03 With ANSI 96 any aid with a compression knee point be
156. target Figure 5 4 2 shows an example of the real ear SPL screen with a DSL target OUTPUT SPL Site ETAGE TED POWER RENCE MIC OFF in ICRU 1j 58 COMP 5 Soro MONTH ICRU 2 7a COMP ICRU 3 90 SHORT RGE DSL MDRC 25 Figure 5 4 2 Real ear SPL screen using a DSL WDRC target Real Ear Measurements 91 5 4 3 Viewing the SPL screen See Figure 5 4 3 for a picture of the SPL testing screen 1 SQ OT TON SM ee eS FP e e e n KR WN F O 16 Curve box containing the source type and amplitude of each of the three measurement curves Source type for current curve Noise reduction status for current curve Reference microphone status Smoothing status Leveling status RMS source level used to take measurement RMS of the current curve Not available with pure tone source types Output limit status Selected ear Selected age of client SPL graph for aided measurements HTL UCL and AIDED 2 target UCL values shown in dB SPL Target for AIDED 2 shown in dB SPL 15 HTL values shown in dB SPL Selected fitting rule OUTPUT AIDED 9 TARSET A 5 Figure 5 4 3 SPL Testing screen 5 4 4 Taking the SPL measurements 1 92 Create the real ear target if desired by following the instructions found in Section 5 2 Make sure to choose SPL in step 2 of that section FONIX FP40 Portable Hearing Aid Analyzer 2 Set up the client insert the probe
157. tery Size Battery Chemistry Impedance Voltage NONE OV 10A 230 ZINC AIR 312 SILVER 312 MERCURY 312 ZINC AIR 13 SILVER 13 MERCURY 13 ZINC AIR 76 SILVER 675 MERCURY 675 ZINC AIR 401 MERCURY AA LOW BAT 1 0V 5 ZINC AIR FONIX FP40 Portable Hearing Aid Analyzer 151 Index A Accessories 6 Optional 6 Real Ear 8 Standard 5 ACIC 55 72 Aided response 87 ANSI 23 43 48 ANSI S3 22 1987 55 56 58 59 60 61 63 64 66 67 69 70 71 results 64 settings 63 ANSI 3 22 1996 55 59 results 58 62 ANSI 3 22 2003 55 ANSI 3 42 1992 55 65 results 67 running 66 settings 66 Audibility Index AI 94 Automated coupler test sequence 20 B Battery current drain 26 46 Battery pack 1 5 6 8 Battery Pack Option 32 Battery pills 6 8 Battery simulator 151 Bi CROS aids 109 Buttons front panel 11 C Cables 8 Calibration 129 Calibrator sound level 6 CIC correction factors 139 CIC Option 4 52 137 Cleaning the display 15 Compensating Probe Microphone 130 Composite 23 25 43 48 Composite display 36 Composite Option 2 21 Index Coupler prescription 105 Couplers 6 6 cc 6 CIC 7 ear level adapter 5 HA 1 5 HA 2 5 Coupler prescription 101 D Data 108 Default target 84 Digital aids 47 Digital Speech Option 2 Directional Hearing Aids 49 114 testing 114 Display 44 DSL 91 coupler 100 programming 149 E Earhook 8 adult 9 child 8 infant 9 Fartips 8 External monitor 1 3 12 26 External
158. the Parallel side of the serial to parallel converter n ogv gv de d Attach the other end of the printer cable to your external printer 14 FONIX FP40 Portable Hearing Aid Analyzer If desired plug in an external video monitor to the connector labeled Video Monitor on the back of the FP40 You can also plug in an external sound chamber or an external sound field speaker into the exter nal speaker jack of the FP40 Hint When something is plugged into the external speaker jack the sound source of the FP40 is always delivered to that external source regardless of whether you are performing a coupler test or a real ear test 1 6 3 Connecting the line cord Plug the line cord into the jack on the right side of the analyzer Push the on off rocker switch on the back of the unit The green LED labeled line power FP40 or power FP40 D will light up This will turn on the analyzer if you have an FP40 D model To fully turn on an FP40 model ana lyzer push the square gray button marked OPERATE on the front panel 1 7 Miscellaneous This section describes how to clean and service your FP40 analyzer Warranty information is also included 1 7 1 Servicing Your FP40 Contact Frye Electronics Inc Box 23391 Tigard Oregon 97281 3391 for service Our toll free number is 1 800 547 8209 Our regular number is 503 620 2722 or you may contact your local Frye representative We are also available on the internet
159. the measurement 4 Choose the amount of noise reduction used in the soft speech curve with F6 Choose the battery type with F7 4 6 2 Running the test sequence 1 Level the sound chamber if necessary See Section 3 2 for details 2 Set the aid to normal user settings If the aid has a volume control it should be set to the set ting most used by the client Attach the aid to the appropriate coupler and place it in the sound chamber 3 4 Close the door of the sound chamber 5 Press START STOP to begin the measurement 6 After taking most of the measurements the analyzer will pause If the aid has a volume control use it to turn the aid to full on gain and press START STOP to complete the test Otherwise press the DATA GRAPH button to end the test 4 6 3 Viewing the results See Figure 4 6 3 for an example of a Profiler test sequence OSPL90 Pure tone sweep at 90 dB SPL Total harmonic distortion measurements MAX OUT Maximum output from the OSPL90 measurement NOISE RED Noise reduction used for soft measurement curve CRV GAIN RMS of the medium speech curve or overall average gain of the aid EQ INP NOISE Equivalent input noise and the type of measurement used to take it BATTERY Battery current drain CONE Oy SG Be Gor cs sel S M and L Soft medium and loud speech curves taken at 50 65 and 80 db SPL respec tively 9 R Full on gain response curve taken at 65 dB SPL Automated Test Sequences 71
160. to overcome a severe unilateral high frequency loss you may want to ensure that inserting an open earmold into the good ear has not significantly attenu ated the acoustic transmission to the good ear Note Since this is a monaural measurement a 45 position of the loudspeaker is recommended Two Measurements A Unaided Unoccluded Ear canal Response of good ear Set up the FP40 analyzer as follows Reference microphone ON Sound field LEVELED Unaided CUSTOM Reference microphone over pinna of good ear gog p A Probe microphone inside unoccluded ear canal of good ear PREFERENCE MIC Loudspeaker at 45 toward good ear 12 inches from sur face of head P d B Aided Occluded Response of good ear PROBE MIG p Same setup as A except Earmold in place in good ear SPEAKER Hearing aid is turned off The difference curve labeled Insertion Gain on the screen shows insertion loss if any caused by inserting the earmold into the good ear Real Ear Measurements 113 5 10 FM Systems For users who test FM Systems a comprehensive guidebook is available free of charge Contact the factory and request the publication Testing FM Systems with FONIX FP40 Analyzers 5 11 Testing Directional Aids Perhaps the most convenient way to test directionality is with a real ear measurement You can use the Insertion Gain screen on the FP40 analyzer to show you the forward and reverse responses as well as a curve
161. to push the microphone until it stops Place the completed assembly over the center of the speaker in the test chamber With ITEs the position of the aid can affect the frequency response If possible point the faceplate of the aid toward the right or the left If you are using a battery pill be sure the metal conductor strip does not obstruct the sound path Adjust the tone and gain controls of the aid to the desired positions Place the hearing aid into the sound cham ber so that the microphone of the aid is centered over the speaker Insert the FP40 microphone into the HA 2 coupler and then snap the receiver onto the end of the coupler Place the coupler outside of the sound chamber and close the lid If possible remove the ear piece contain ing the hearing aid from the glasses Attach the receiver nub of the aid to the ear level adapter on the HA 2 coupler Place the assembly in the sound chamber with the microphone of the aid at the cen ter of the speaker If it is not possible to disassemble the eye glass aid you must fold it on itself and get as close as possible to the setup just described 41 3 4 Frequency responses The Main Coupler Screen lets you take the frequency response of the hearing aid You can Use a variety of signal sources View multiple responses at once Find the single frequency response of the aid Take a three frequency average View the harmonic distortion in bars or in a separate
162. udibility Index shows you what percentage of speech sounds are audible to the client with the aided audiograms you have obtained This Audibility Index is based on the Hearing Level at eight frequencies weighed according to their importance This index was primarily based on the publica tion by Mueller and Killion An Easy Method For Calculating the Articulation Index The Hearing Journal September 1990 The name Audibility Index came from A is for Audibility by Killion Mueller Pavlovic and Humes The Hearing Journal April 1993 94 FONIX FP40 Portable Hearing Aid Analyzer 5 5 1 Viewing the AI display See Figure 5 5 1 for a picture of the Audibility Index display dB HL graph for unaided and aided audiogram responses Aided audiogram responses from insertion gain measurements Insertion gain target displayed in dB HL Table containing expected percentage of audibility of speech Selected fitting rule Source type for current curve a 9x Wig Ges d cen Noise reduction status for current curve STATUS COMPOSITE ikHz2 8 WEIGHTED GAIN AUDIOGRAM 7 NOISE RED 18K REFERENCE MIC ON SHOOTHING LOG LEVELED RMS OUT 91 6 dB OUTPUT LIN 120 dB lt 3 EAR SELECT LEFT Figure 5 5 1 External video display of the Audibility Index 8 Reference microphone status 9 Smoothing status 10 Leveling status 11 RMS source level used to take measurement 12 RMS of the current curve Not available with pure tone
163. uires the Telewand Press DATA GRAPH if you are testing an AGC aid This will change the function key labels Otherwise skip to step 14 Press F2 to choose a frequency and press F3 to select whether or not you want to run an input output I O curve at this frequency Repeat this for each of the five available frequen cies Use F5 to select the amount of time the first frequency of each I O curve is presented before the measurement is made Use F6 to select the amount of time each subsequent frequency is presented before a mea surement is made This should be at least twice as long as the manufacturer specified attack time Use F9 if you would like to identify the ear tested Return to the main function button selections by pressing DATA GRAPH Press F8 to save your settings if desired 4 2 3 Running the test sequence 1 2 3 4 5 10 11 12 13 Level the sound chamber if necessary See Section 3 2 for details Set up the aid for testing See Section 4 2 1 Close the sound chamber Press START STOP when you are ready to begin the test Wait for several tests to be run For most aids the analyzer will pause after performing sev eral measurements in order for you to turn down the gain of the aid If the analyzer pauses open the sound chamber and adjust the gain control of the aid until the MEASURED gain matches the TARGET gain to within 1 dB when the sound chamber is closed Press START STOP to resume testing
164. up Menu Use the AMPLITUDE and FREQUENCY knobs to select MENU TYPE Press START STOP to choose PARTIAL The menu will now only display the selections appli cable to ANSI 03 Use the AMPLITUDE and FREQUENCY knobs in conjunction with the START STOP button to choose the settings for NOISE REDUC SETTL TIME and AVG FREQS under PURETONE SETTINGS These settings are explained in Section 2 4 1 Use the AMPLITUDE and FREQUENCY knobs in conjunction with the START STOP button to select whether or not you will use the REFERENCE MIC for testing We generally recommend selecting OFE See Section 3 4 9 Use the AMPLITUDE and FREQUENCY knobs in conjunction with the START STOP button to select the type of battery pill used in the measurement This is used in testing battery current drain Press F1 to return to the ANSI 03 screen Press F2 to choose the type of aid you are testing The selections are AGC ADAPTIVE AGC and LINEAR 50 Choose LINEAR 50 for linear aids Choose AGC for most AGC aids Choose ADAPTIVE AGC if the aid has adaptive release times This is also a suitable selec tion for digital aids that require extra time to adjust to input signals Use F5 to turn ON or OFF the telecoil measurement The ANSI 03 telecoil measurement requires the Telewand Press DATA GRAPH If you are testing a linear hearing aid skip to step 15 Press F2 to choose a frequency and press F3 to select whether or not you want to run an input output I O
165. up the aid for testing To enter the ANSI 87 screen 1 5 6 From the Main Coupler Screen look at the FP40 s display above the F4 function key If it says AN87 or ANSI for units with older software versions skip to step 6 Press F1 Menu Use the AMPLITUDE and FREQUENCY knobs to select MAIN F4 under FUNCTION KEY DEFIN Press START STOP to choose AN87 or ANSI for units with older software versions This will let you use the F4 function key to enter the ANSI 87 screen from the Main Coupler Screen Press F1 to return to the Main Coupler Screen Press F4 to enter the ANSI 87 screen To change the ANSI 87 settings 1 4 Press F2 to choose the type of aid you are testing The selections are AGC 50 LINEAR 50 LINEAR 60 Choose LINEAR 60 for most linear aids Choose LINEAR 50 for high gain aids Choose AGC for AGC aids Note If you are testing a digital aid you should usually select AGC for this setting However ask the hearing aid manufacturer for guidance Press F3 to select the last frequency of the three frequency average used in the test sequence See Section 2 4 1 for details Press F5 to turn the telecoil test off and on The telecoil test requires the external telecoil board Press F6 to select the noise reduction used in the measurements Automated Test Sequences 63 5 6 Press F7 to select the battery type used in the measurements Press F8 to select whether or not you wan
166. uth 2 Look above F3 and make sure that AIDED 1 is highlighted If it is not press F3 to selected it 3 Press START STOP to start the measurement The source type and level should be the same as used for the reverse measurement 4 Press START STOP again once the measurement has stabilized The aided 1 measurement is now the forward measurement of the directional aid 5 Look at the insertion gain graph on the left side of the screen This shows the directional ben efit of the hearing aid the reverse measurement subtracted from the forward measurement Real Ear Measurements 115 Chapter 6 Spectrum Analysis 6 1 Spectrum Mode This mode is only available on FP40 instruments that have the Real Time Composite Signal The FONIX FP40 can be used as a sound spectrum analyzer in either the coupler test box or real ear test modes When the Spectrum Mode is selected external sounds can be measured through the microphones or through a direct electrical connection and displayed in an amplitude vs frequency format 6 2 Entering the Spectrum Mode The FP40 must be in the COMPOSITE MODE 1 Turn the AMPLITUDE control knob to the left counter clock wise until the RMS Source is OFE 2 The Status information box should read Spectrum Mode 6 3 Using the Spectrum Mode You should find the following three suggested applications clinically helpful interesting and fun APPLICATION 1 MEASURING T
167. vel for Aided curve 2 2 Interpolate from 10 frequency to 80 frequency curve frame 3 Add the AVG Unaided ear response REUR in Table 1 4 If Aided 2 is composite subtract 10 7 dB from each frequency If Aided 2 is Speech Weighted tone add 2 1 dB to each frequency 5 If Aided 2 is Speech Weighted subtract the Speech Weighting in Table 2 The complete formula is then Target SPL Target IG CRV2 source AVG REUR If Aided2 is composite 10 7 dB Speech Weighting If Aided2 is speech tone 2 1 dB Speech Weighting To convert the HTL and UCL from HL to SPL Add the corrections in Table 3 To predict UCIs HL given the HTL HL Use Table 4 to convert from HTL to UCL FONIX FP40 Portable Hearing Aid Analyzer 145 TABLE 1 Average Real Ear Unaided Response REUR FREQ GAIN FREQ GAIN FREQ GAIN FREQ GAIN Hz dB Hz dB Hz dB Hz dB 2100 13 9 4100 12 7 6100 7 7 200 1 6 2200 14 7 4200 12 4 6200 7 5 300 2 1 2300 15 1 4300 12 2 6300 7 3 400 2 7 2400 15 0 4400 12 0 6400 7 2 500 2 9 2500 15 1 4500 11 9 6500 7 1 600 2 9 2600 15 0 4600 11 7 6600 6 9 700 3 1 2700 14 6 4700 11 6 6700 6 8 800 3 3 2800 14 1 4800 11 2 6800 6 6 900 3 6 2900 13 6 4900 10 7 6900 6 5 1000 3 4 3000 13 7 5000 10 3 7000 6 4 1100 3 1 3100 13 8 5100 9 9 7100 6 2 1200 3 6 3200 14 1 5200 9 5 7200 6 1 1300 4 2 3300 14 5 5300 9 2 7300 6 0 1400 4 4 3400 14 8 5400 8 9 7400 5 7 1500 5 6 3500 14 9 5500 8 7 7500 5 4 1600 7 0 3600 14 7 5600
168. w the hearing loss and the amplification solution provided without the confusion of different frames of reference 5 4 1 Understanding the SPL approach The idea behind the real ear SPL screen is to run three aided response measurements on each hearing aid Unaided measurements are not necessary in the SPL approach These measurement curves are to make sure soft sounds are audible AIDED 1 moderate sounds are comfortable and meet the target AIDED 2 loud sounds do not exceed the user s uncomfortable loudness level AIDED 3 The factory default amplitudes used in this program are generally 50 65 and 90 dB Sometimes this differs depending on the default fitting rule and the configuration of the analyzer The user may choose other amplitude levels while conducting the tests To change the level of the SPL target modify the amplitude and source type of AIDED 2 As with other SPL measurements the reference microphone is turned off during this test Sound field leveling is still necessary but extra care should be taken by the client not to move around once leveling has been achieved Some notes on the SPL display When a pure tone or warble signal sweep is chosen for the SPL test type it is always speech weighted unless the amplitude is 85 dB or above The target is also speech weighted The measurements and the target will therefore look different from the insertion gain targets that have been commonly used The speech weig
169. will store the individual item set ting To set the default settings of the entire menu at once make any desired changes in the General Setup Menu and press F9 This will store the entire menu 2 2 83 Switching between partial and full menus Not all the items in the General Setup Menu will apply to every screen of the FP40 In order to avoid information overload the FP40 has a Partial Menu mode If the FP40 is in PARTIAL Menu mode it will only display the items of interest to the screen you just left For instance if you enter the General Setup Menu from the Main Coupler Screen the par tial menu will not display Probe Settings Also if you have selected a composite signal source it will not display the pure tone settings When the FP40 is in FULL Menu mode it will display all available settings regardless of the screen that you just left or the signal source you have chosen To switch between Partial Menu mode and Full Menu mode select MENU TYPE in the General Setup Menu Choose between FULL and PARTIAL 18 FONIX FP40 Portable Hearing Aid Analyzer 2 3 Using Function Keys The front panel of the FP40 analyzer contains nine function keys F1 through F9 These keys control the navigation through the FP40 screens as well as some settings in each screen 2 3 1 Hints The first thing you need to understand when working with the FP40 is the concept of function keys In order to make it easier to add new functions an
170. with the current measurement to produce the next curve If you select 2X noise reduction it will aver age the last two measurements together A selection of 4X averages the last four measurements together Larger noise reduction numbers lead to smoother curves but increase the amount of time it takes the analyzer to update its composite measurements 2 4 2 3 Intermodulation Distortion The composite signals are helpful for identifying intermodulation IM distortion IM distortion occurs when amplitudes at more than one frequency in a signal combine to create an amplitude at a frequency not present in the original signal When viewing a graph run with a composite signal look for points along the graph where the line breaks up Such an appearance indicates the pres ence of IM distortion See Figure 2 4 2 3 for an example of IM distortion 24 FONIX FP40 Portable Hearing Aid Analyzer This type of distortion is only apparent when a composite signal source is used because pure tone sweeps do not present more than one frequency at a time COUPLER COMPOSITE FANSI WEIGHT GAIN HOISE RED i iREFERENCE MIC OFF LEVELED iRMS SOURCE 70 dB iRMS OUT 126 5 dB BAT 13 ZINC HIR 1 mA Figure 2 4 2 3 IM distortion 2 4 2 4 Composite source levels When you adjust the amplitude of a composite signal you are adjusting the root mean square RMS of the signal not the amplitude of the individual frequency compo
171. with the owner s name and address or phone number Specify two lines of 27 characters each at time of purchase and we will program them into your instrument The ID can be changed for a modest fee with an exchange of PROMs Programmable Read Only Memory 1 3 6 RS232 Option The RS232 Option allows you to hook your analyzer up to a computer so you can grab your ana lyzer data from your analyzer and save it on your computer It includes internal FP40 software and external RS232 cables and connectors In order for you to communicate with your analyzer you will also need a corresponding program on your computer such as WinCHAP It is also possible to create your own custom program for communicating with your FP40 1 3 7 OES Occluded Ear Simulator Option The OES Option provides special couplers the MZ series and correction factors to produce the same results as a real ear simulator Zwislocki coupler when simulating occluded ear measure ments in the sound chamber See Section 3 7 for more details 1 3 8 CIC Completely In the Canal Option The CIC Option was designed as a realistic coupler test for CIC hearing aids It uses a 0 4 cc cou pler combined with software correction factors in order to create a response curve that is more like what you would expect to see in a person s ear than the response curve you will get using a stan dard HA 1 coupler See Section 3 6 for more details 4 FONIX FP40 Portable Hearing Aid Analyzer 1 4
172. you in a target editing mode 3 Use the AMPLITUDE and FREQUENCY knobs to generate your own insertion gain target You cannot input target values in terms of dB SPL 5 2 5 Modifying an existing target All non DSL targets can be modified To modify an existing target 1 Generate the target as described in Section 5 2 2 2 Press F2 until TAR is highlighted 3 Use the AMPLITUDE and FREQUENCY knobs to make any desired modifications The target will be labeled with a note denoting that it has been modified See Figure 5 2 5 1 kHz 2 Figure 5 2 5 Modifying an existing target 5 3 Insertion Gain Measurements The insertion gain test shows you how much gain the hearing aid is providing above the ear s natu ral resonance When performing an insertion gain measurement you enter your client s thresholds to create a target take the unaided response take the aided response and compare the insertion gain response to the insertion gain target adjusting the hearing aid accordingly Real Ear Measurements 85 5 3 1 Viewing the Insertion Gain screen Here is an picture of the Insertion Gain screen Insertion gain graph Source type for current curve Noise reduction status for current curve Reference microphone status Smoothing status Leveling status RMS source level used to take measurement BO OOS om COS ES cs spes Re nes Output limit status n o Selected ear n m Fitting rule used to create inserti

Frye FP40D Hearing Aid User Manual

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