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Chapter 5: Real-Ear Measurements

5.1 Preparation for Real-Ear Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

5.1.1 Setting up the analyzer for testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

5.1.1.1 To set up the microphones and monitor headset. . . . . . . . . . . . . . . . . . . . 73

5.1.1.2 To set up the internal sound field speaker. . . . . . . . . . . . . . . . . . . . . . . . . 74

5.1.1.3 To set up an external sound field speaker . . . . . . . . . . . . . . . . . . . . . . . . . 76

5.1.2 Setting up the client for testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

5.1.2.1 To position the sound field speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

5.1.2.2 To place the earhook and reference microphone . . . . . . . . . . . . . . . . . . . . 77

5.1.2.3 To insert the probe tube. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

5.1.2.4 To level the sound field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

5.2 The Target Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

5.2.1 Viewing the target screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

5.2.2 Creating a target. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

5.2.3 Setting the default target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

5.2.4 Creating your own target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

5.2.5 Modifying an existing target. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

5.3 Insertion Gain Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

5.3.1 Viewing the Insertion Gain screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

5.3.2 Taking an unaided response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

5.3.3 Taking an aided response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

5.3.4 Viewing insertion gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

5.3.5 Testing Open Fit Hearing Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

5.4 SPL Measurements (including real-ear DSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

5.4.1 Understanding the SPL approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

5.4.2 Understanding the specifics of DSL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

5.4.3 Viewing the SPL screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

5.4.4 Taking the SPL measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

5.5 Audibility Index (AI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

5.5.1 Viewing the AI display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

5.5.2 Performing AI measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

5.6 DSL Coupler Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

5.6.1 Performing the RECD measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

5.6.1.1 To perform the coupler measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

5.6.1.2 To perform the real-ear measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

5.6.2 Performing coupler measurements to a DSL target . . . . . . . . . . . . . . . . . . 100

5.7 Coupler prescription (non DSL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

5.7.1 Viewing the Target 2-cc screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

5.7.2 Taking the FOG measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

5.7.3 Viewing the SSPL 90 screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

5.7.4 Taking the SSPL 90 measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

5.7.5 Checking an aid against a prescription . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

5.7.6 Accounting for venting effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

5.7.7 Understanding the technical details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Содержание FONIX FP40

Страница 1: ...ber 2005 Frye Electronics Inc Rev Jun 04 2007 All Rights Reserved 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 ...

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Страница 3: ...0 1 5 2 Front Panel Buttons 11 1 5 3 Front Panel Lamps 11 1 5 4 Front Panel Knobs 12 1 5 5 Rear Panel Controls 12 1 5 6 Right Side Mounted Jack and Module 13 1 5 7 Sound Chamber Mounted Jacks and Controls 13 1 5 8 Top of Instrument Printer 13 1 6 FP40 Setup 14 1 6 1 Setting up the instrument 14 1 6 2 Connecting equipment 14 1 6 3 Connecting the line cord 15 1 7 Miscellaneous 15 1 7 1 Servicing You...

Страница 4: ... external printer 30 2 9 4 Printing a label 31 2 10 The Opening Screen 32 2 11 The Battery Option not available on FP40 D 32 Chapter 3 Coupler Measurements 3 1 The Main Coupler Screen 35 3 1 1 Viewing a Pure tone display 35 3 1 2 Viewing a Composite display 36 3 2 Leveling 36 3 2 1 Leveling without the reference microphone standard 37 3 2 2 Leveling with the reference microphone 37 3 2 3 Saving th...

Страница 5: ... 2 Setting up the analyzer for testing 56 4 1 3 Running the test sequence 58 4 1 4 Viewing the results 58 4 2 ANSI S3 22 1996 59 4 2 1 Setting up the aid for testing 59 4 2 2 Setting up the analyzer for testing 60 4 2 3 Running the test sequence 61 4 2 4 Viewing the results 62 4 3 ANSI S3 22 1987 63 4 3 1 Setting up for the test 63 4 3 2 Running the test sequence 64 4 3 3 Viewing the results 64 4 ...

Страница 6: ...2 Taking an unaided response 86 5 3 3 Taking an aided response 87 5 3 4 Viewing insertion gain 88 5 3 5 Testing Open Fit Hearing Aids 89 5 4 SPL Measurements including real ear DSL 90 5 4 1 Understanding the SPL approach 90 5 4 2 Understanding the specifics of DSL 91 5 4 3 Viewing the SPL screen 92 5 4 4 Taking the SPL measurements 92 5 5 Audibility Index AI 94 5 5 1 Viewing the AI display 95 5 5 ...

Страница 7: ... 5 11 2 Forward Measurement 115 Chapter 6 Spectrum Analysis 6 1 Spectrum Mode 117 6 2 Entering the Spectrum Mode 117 6 3 Using the Spectrum Mode 117 Chapter 7 Telecoil Testing 7 1 Setup with the Telecoil Board 121 7 2 Setup with the Telewand 122 7 3 Environmental Magnetic Fields 123 7 4 Testing 124 Appendices Appendix A Specifications 125 Appendix B Calibration 129 Appendix C History of Changes 13...

Страница 8: ...mens Hearing Instruments Alexandra House Newton Road Manor Royal Crawley West Sussex RH109TT England Otherwise please report all safety related concerns to Frye electronics Inc P O Box 23391 Tigard OR 97281 3391 USA Frye Electronics is a Registered Firm of British Standards Institution and we conform tothe ISO 13485 standard ...

Страница 9: ...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...

Страница 10: ...esented 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 artifac...

Страница 11: ... is received by the client Many factors affect the sound on its way to the ear 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 orderi...

Страница 12: ... 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 me...

Страница 13: ...es available for the FP40 analyzer are described in this section 1 4 1 Standard Accessories Microphone Adapter 14 mm to ANSI 1 diameter microphone size This is used for calibrating the FP40 microphones Ear Level BTE Adapter Snaps into the 1 4 6 35 mm diam eter cavity in the HA 2 2 cc coupler or the MZ 2 coupler Equipped with a 0 6 15 mm length of 0 076 1 93 mm ID tubing the adapter allows ANSI S3 ...

Страница 14: ...dered 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 1 4 2 Optional Accessories 6 CC Coupler Per ANSI S3 7 for NBS 9A used to check output of audiometers Sound Level Calibrator For microphone calibration ...

Страница 15: ...use with CIC Option 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 5 Battery Pill 12 or 24 Needed for some CIC hearing aids External Telecoil For checking the response of aids in the telephone mode ...

Страница 16: ...040 Sound Chamber Cable External Printer Package serial to parallel converter printer cable and custom cable Y adapter for using both external printer and RS232 Eartips 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 Accesso...

Страница 17: ...le Allows precise placement and aiming of the loudspeaker Monitor Headset folding Optional with FP40 D 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 Infant Child Headband Package Includes infant child and adult head bands six flexible earhooks and two sets of animal ears...

Страница 18: ...ats 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 F1 F2 F3 F4 F5 F6 F7 F8 F9 LINE POWER OPERATE RESET LEVEL START STOP DATA GRAPH PRINT FEED FREQUENCY AMPLITUDE CONTRAST Figure 1 5 1A FP40 Front Panel Function Buttons F1 F2 F3 F4 F5 F6...

Страница 19: ...e 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 corrections to adjust the signal so that it is at the correct level for each test frequency Reset Resets the test signal to the amplitude...

Страница 20: ...0 8 6 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 box FONIX 6040 to be connected to the speaker drive from the FP40 Headphones A standard 1 4 inch phone jack and volume control that allows the monitoring of the sound reaching the probe microphone Serial Interface Nine pin D jack for RS232 connection ...

Страница 21: ...oose 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 Printer Paper Release Lever Printer Door Figure 1 5 8 Electronics Module Top View ...

Страница 22: ...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 FONIX FP40 EXTERNAL PRINTER SERIAL TO PARALLEL CONVERTER SERIAL INTERFACE Figure 1 6 2 External printer setup 1 Make sure the FP40 is turned off 2 Attach the connector labeled FP40 Printer to the serial interface connector on the back of the FP40 3...

Страница 23: ...gon 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 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 lo...

Страница 24: ... 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 defects 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 ca...

Страница 25: ...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 press...

Страница 26: ... Setup Menu change it to the desired setting and press F8 This 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 3 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 avoi...

Страница 27: ...t as possible when you switch from screen to screen For example 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 di...

Страница 28: ...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 ...

Страница 29: ...ad 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 for a parti...

Страница 30: ...E 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 Gener...

Страница 31: ... Understanding 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 in...

Страница 32: ...onments 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 with the current measurement to produce the next curve If you select 2X noise reduction it will aver age the last t...

Страница 33: ...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 ...

Страница 34: ...n on the analyzer or Highlight DISPLAY MODE in the General Setup Menu by using the Amplitude and 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 9...

Страница 35: ...ad 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 Figure 2 6B Coupler screen with battery drain N...

Страница 36: ...3 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 can 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 th...

Страница 37: ...art 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 p...

Страница 38: ...zer 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...

Страница 39: ...mpatible 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...

Страница 40: ... 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 accurate 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 l...

Страница 41: ...rdware 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 i...

Страница 42: ......

Страница 43: ...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 Figure 3 1 1 Pure tone coupler screen 1 Display type dB GAIN or dB SPL 2 Signal type 3 ...

Страница 44: ...f 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...

Страница 45: ...icrophone 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 Secti...

Страница 46: ...vel 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 1 Pres...

Страница 47: ...dapter onto the end of the coupler 5 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 3 3 2 Setting up an ITE ITC CIC 1 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 2 Bend the Fun Tak rod around the canal o...

Страница 48: ...e 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 ...

Страница 49: ...controls of the aid to the desired positions 2 Place the hearing aid into the sound cham ber so that the microphone of the aid is centered over the speaker 3 Insert the FP40 microphone into the HA 2 coupler and then snap the receiver onto the end of the coupler 4 Place the coupler outside of the sound chamber and close the lid 3 3 4 Setting up an eyeglass aid 1 If possible remove the ear piece con...

Страница 50: ... 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 Press F1 MENU to enter the General Setup Menu 2 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...

Страница 51: ...amber every time you turn it on but it s a good idea to level the chamber and save the leveling about once a week 2 Set up the hearing aid in the sound chamber as described in Section 3 3 3 Choose a source type as described in Section 3 4 1 4 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 STAT...

Страница 52: ...see a MULTICURVE REPORT box that will contain a legend for four curves This will give you data about each curve 7 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 select a curve that already contains a fre...

Страница 53: ... have the Composite signal on your analyzer you won t see a selection for SOURCE type 3 Use the FREQUENCY and AMPLITUDE knobs to select MAIN F2 or MAIN F3 4 Press START STOP repeatedly until you select AVG 5 Use the FREQUENCY and AMPLITUDE knobs to select AVG FREQS under PURE TONE SETTINGS 6 Press START STOP to toggle the desired three frequency average represented by the highest of the frequencie...

Страница 54: ...ton 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 a...

Страница 55: ...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 s...

Страница 56: ...tal 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 Digi...

Страница 57: ...y 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 b...

Страница 58: ...er while standing to the side of the sound field See Figure 3 6 1 4 Push the LEVEL button on your analyzer from the coupler measurement screen This will level the sound field 5 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...

Страница 59: ...se 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 2 Make sure the aid is the same distance from the speaker that you used for the forward ...

Страница 60: ...ment 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 Attach the CIC coupler to the CIC aid just as you would attach an HA 1 couple...

Страница 61: ...ed 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 ...

Страница 62: ...he Ear Level Hearing Aid Adapter that normally snaps onto the HA 2 2cc coupler MZ 3 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 BODY MZ 2 With snap on receivers use the MZ 2 without the Ear Level Hearing Aid Adapter attaced Figure 3 8A Choosing the proper ...

Страница 63: ...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 quick...

Страница 64: ...elow 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 control...

Страница 65: ...e aid has adaptive release times This is also a suitable selec tion for digital aids that require extra time to adjust to input signals 9 Use F5 to turn ON or OFF the telecoil measurement The ANSI 03 telecoil measurement requires the Telewand 10 Press DATA GRAPH If you are testing a linear hearing aid skip to step 15 11 Press F2 to choose a frequency and press F3 to select whether or not you want ...

Страница 66: ...ids 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 10 Press START STOP to take the telecoil measurements 11 Put the aid back into microphone mode when the analyzer instructs you to 12 Unplug the telewand from the External Speaker jack on the back of the FP40 13 If you have set the aid type to...

Страница 67: ... measurements at up to five different frequencies 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 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 wi...

Страница 68: ...u 2 Use the AMPLITUDE and FREQUENCY knobs to select MENU TYPE 3 Press START STOP to choose PARTIAL The menu will now only display the selections appli cable to ANSI 96 4 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 5 Use the AMPLIT...

Страница 69: ...the aid for testing See Section 4 2 1 3 Close the sound chamber 4 Press START STOP when you are ready to begin the test 5 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 6 If the analyzer pauses open the sound chamber and adjust the gain control of the aid until the MEASURED gain matches...

Страница 70: ... of the OSPL90 curve 8 SPA HFA FOG Three frequency average of a full on gain measurement at 50 or 60 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 har...

Страница 71: ...ess F1 Menu 3 Use the AMPLITUDE and FREQUENCY knobs to select MAIN F4 under FUNCTION KEY DEFIN 4 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 5 Press F1 to return to the Main Coupler Screen 6 Press F4 to enter the ANSI 87 screen To change the ANSI 87 settings 1 Press...

Страница 72: ... 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 6 Wait for several tests to be run For m...

Страница 73: ...a series of tests designed for non linear hearing aids Although 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 i...

Страница 74: ...f time that the analyzer presents the Composite signal before taking the measurement You should choose a value twice the pub lished attack specification 3 Press F6 to choose the amount of noise reduction used for the measurements See Section 2 4 2 2 4 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 ...

Страница 75: ...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 sequenc...

Страница 76: ...NEAR 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 2 Press F3 to set the reference test frequency If possible use the frequency recomme...

Страница 77: ...s instead of using the FP40 s calculated target value However we have never found any difficulties with using the FP40 s calculated target reference gain 7 Press START STOP to complete the test sequence 8 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 1 Response curve at 60 d...

Страница 78: ... 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 From the Main Coupler Screen look at the FP40 s display above the F4 function key If it says PROF 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 PROF This w...

Страница 79: ...in the sound chamber 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 Pro...

Страница 80: ...s 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 ...

Страница 81: ...hone 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 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 e...

Страница 82: ...ure 5 1 1 2A spring catch interlocking stop plates velcro speaker jack recessed channel slips over upright speaker post speaker jack pop up speaker post 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 fro...

Страница 83: ...chieved 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 upright 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 ba...

Страница 84: ... 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 ...

Страница 85: ...ient 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 turnin...

Страница 86: ... 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 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 1 Press F5 to enter Probe Mode 2 Press F7 to se...

Страница 87: ... 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 1 Position the client 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 Pre...

Страница 88: ...tting 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 t...

Страница 89: ...nts 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 measure...

Страница 90: ...ot 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...

Страница 91: ...0 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 Press F5 to enter the real ear measurement screen from the Main screen 2 Press F2 if necessary to highlight SPL SPL o gram IG Insertion Gain or AI Audibility Index as the real ear measureme...

Страница 92: ... Step 2 of the above instructions an insertion gain graph will appear on the left side of the target 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 a...

Страница 93: ...sting 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 Figure 5 2 5 Modifying an existing target 5 3 Insertion Gain Measurements The insertion gain test shows you how much gain the hearing ...

Страница 94: ...t limit status 10 Selected ear 11 Fitting rule used to create insertion gain target 12 Graph containing unaided and aided gain responses Figure 5 3 1 Insertion Gain display 5 3 2 Taking an unaided response 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 la...

Страница 95: ...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 Insert the aid into the ear making sure the probe tube remains in position 2 Look at the label above F3 AIDED 1 should be highlighted assuming you followed the instructions from Section 5 3 2...

Страница 96: ...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 amplif...

Страница 97: ...TINGS Press START STOP to change the setting to OFF 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 measure m...

Страница 98: ...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 level...

Страница 99: ...ations 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 si...

Страница 100: ... RMS source level used to take measurement 8 RMS of the current curve Not available with pure tone source types 9 Output limit status 10 Selected ear 11 Selected age of client 12 SPL graph for aided measurements HTL UCL and AIDED 2 target 13 UCL values shown in dB SPL 14 Target for AIDED 2 shown in dB SPL 15 HTL values shown in dB SPL 16 Selected fitting rule Figure 5 4 3 SPL Testing screen 5 4 4 ...

Страница 101: ... 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 th...

Страница 102: ... is then added to the unaided audiogram to obtain the curves shown on the HL dis play The Audibility 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 Kil...

Страница 103: ...rtion gain target displayed in dB HL 4 Table containing expected percentage of audibility of speech 5 Selected fitting rule 6 Source type for current curve 7 Noise reduction status for current curve 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 ...

Страница 104: ... 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 response of the same insert earphone placed inside the client s ear Why w...

Страница 105: ...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 Coupler mic HA 2 Coupler To 3A insert earphone 25 mm I D 1 93 mm Figure 5 6 1 1A Attaching the two microphones Figure 5 6 1 1B Coupling the coupler microphone together to the insert ear...

Страница 106: ...e real ear measurement 1 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 2 Press F4 to enter Target screen from the Probe screen 3 Press F7 to enter Target 2 cc screen 4 Press F3 to enter RECD mode 5 Press F3 to toggle MEASURED RECD 6 Insert the probe microphone into the clien...

Страница 107: ... clip Microphone jack External speaker jack Probe mic Probe mic Foam eartip 3A INSERT EARPHONE 3A INSERT EARPHONE Foam eartip Probe mic on earhook Custom earmold WITH FOAM EARTIP WITH CUSTOM EARMOLD Figure 5 6 1 2A Setup for real ear part of the RECD ...

Страница 108: ... screen The source used is always the last source type you used in the normal Probe screen 7 Press F4 to choose the aid type 8 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 ...

Страница 109: ... to adjust the aid so the measurement only reaches at or below those symbols See Figure 5 6 2B Figure 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 ar...

Страница 110: ...ontaining the 2 cc target including the calculated target and modified target if available 2 Selected ear 3 Selected aid type 4 Selected coupler 5 Status of unaided response used to make the 2 cc conversion 6 Fitting rule 7 Signal source type 8 Signal source amplitude 9 Status of RECD 10 Age of client 11 Instructions for performing 2 cc target measurements Note Once a measurement is made the modif...

Страница 111: ...knobs to modify the 2 cc target if desired See Section 5 7 6 for some suggested vent corrections 8 Use F6 to select the source level 9 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 Notes Press F8 to clear any modifications made to the target with the AMPLITUDE and FREQUENCY knobs P...

Страница 112: ... fortable for the client even when presented 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 r...

Страница 113: ...3 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 5 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 le...

Страница 114: ...h 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 ea...

Страница 115: ...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 the screen 5 8 2 Smoothing Smoothing is a ...

Страница 116: ...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 Press F1 to enter the Setup Menu from any of the real ear measurement screens 2 Select DATA DISPLAY under PROBE settings using the AMPLITUDE and FREQUENCY knobs 3 Use the START STOP button to select the curve you want to convert to its numerical da...

Страница 117: ...res 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 PROBE MIC TOP VIEW 12 SPEAKER REFERENCE MIC SIDE VIEW PROBE MIC ON EARHOOK BODY AID FACING FORWARD SPEAKER HEAD HIGH 12 Figure 5 9 1 Real ear setup for testing body aids ...

Страница 118: ...ided 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 90º 12 inches from bad ear B Aided Real Ear response on...

Страница 119: ...fference 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 Unaided set to CUSTOM Reference microphone over pinna of bad ear Probe microphone inside ear canal of better ear Hearing aid in bette...

Страница 120: ...icrophone ON Sound field LEVELED Reference microphone over pinna of bad ear Probe microphone inside unoccluded ear canal of good ear Loudspeaker at 0º 12 inches from bridge of nose B Aided Measurement of good ear 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 CR...

Страница 121: ... the good ear Note Since this is a monaural measurement a 45º 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 Probe microphone inside unoccluded ear canal of good ear Loudspeaker at 45º toward good...

Страница 122: ...1 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 avail...

Страница 123: ...rement 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 azimuth 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 ...

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Страница 125: ...uggested applications clinically helpful interesting and fun APPLICATION 1 MEASURING THE 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 ...

Страница 126: ... the hearing aid turned on 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 ...

Страница 127: ...L You should see a graph with the patient s thresholds uncomfortable levels and real ear target all in dB SPL 7 Press F7 to select a source type of COMPOSITE 8 Use the AMPLITUDE knob to turn the source signal all the way OFF This will put the ana lyzer in Spectrum Analysis Mode 9 Place the probe tube as close as possible to the eardrum Marking the probe tube depth at 25 30 mm should accomplish thi...

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Страница 129: ...ion pill to power the aid 2 Place the telecoil board close to the FP40 as shown in Figure 7 1A CAUTION ELECTRICAL SHOCK HAZARD DO NOT REMOVE INSTRUMENT COVER REFER SERVICE TO QUALIFIED PERSONNEL EXTERNAL POWER ON OFF HEADPHONES EXTERNAL SPEAKER VIDEO MONITOR SERIAL INTERFACE FRYE ELECTRONICS INC EXTERNAL SPEAKER TELECOIL BOARD Figure 7 1A Telecoil setup 3 Connect the telecoil to the back of the FP...

Страница 130: ...t 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 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 Plug the Telewand into the e...

Страница 131: ...te 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 ...

Страница 132: ...SI 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...

Страница 133: ...ce point after leveling 2 5 dB for 500 Hz through 3500 Hz 3 5 dB for all other frequencies Harmonic Distortion at 70 dB SPL Less than 0 5 for 500 800 and 1600 Hz COMPOSITE SIGNAL optional Frequencies From 200 Hz to 8000 Hz in 100 Hz intervals Accuracy within 1 Amplitude 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...

Страница 134: ...ured 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 amount equal to the inverse square root of the factor chosen HARMONIC DISTORTION ANALYSIS Type 2nd 3rd and 2nd 3rd total Resolution 0 1 percent Reading Percent with respect to total signal Readings made at frequencies from 400 through ...

Страница 135: ...n white background Print density adjustable in software FP40 only Paper Width 60 mm Access Through top mounted door Other Unit also works with HPCL and EPSON or compatible printers through a serial port SOUND CHAMBER Test Area 3 x 3 7 5 x 7 5 cm in acoustical foam treated area Separate space for excess microphone cord storage Loudspeaker 3 cone mounted in case Case mounts on a swivel arm for probe...

Страница 136: ... 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 you will purchase a hospital grade moni tor However if we ship you our industrial grade monitor we will not affix the UL tag CE Mark Back Pa...

Страница 137: ... Coupler Reference Microphone 1 Place the 1 to 14 mm adapter in the QC 10 calibrator 2 Place the coupler reference larger microphone in the adapter See Figure B 1 3 Turn on the calibrator noticing the stated output 114 dB 4 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 ...

Страница 138: ... 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 unde...

Страница 139: ...ortly 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 I...

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Страница 141: ... 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 HearWare 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...

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Страница 143: ...ing 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 5 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 ...

Страница 144: ...separate sheet of paper subtract the REAR measurements Part B from the 2cc coupler mea surements Part A The differences 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 ...

Страница 145: ...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 an...

Страница 146: ...r 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 soun...

Страница 147: ...00 0 7 2800 1 2900 1 2 3000 1 4 3100 1 65 3200 1 9 3300 2 1 3400 2 2 3500 2 4 3600 2 5 3700 2 7 3800 2 85 3900 2 91 4000 3 4100 3 2 4200 3 3 4300 3 5 4400 3 6 4500 3 7 4600 3 8 4700 3 85 4800 3 95 4900 4 5000 4 07 5100 4 12 5200 4 18 5300 4 2 5400 4 25 5500 4 3 5600 4 35 5700 4 4 5800 4 45 5900 4 5 6000 4 52 6100 4 54 6200 4 55 6300 4 6 6400 4 65 6500 4 7 6600 4 75 6700 4 8 6800 4 85 6900 4 9 7000...

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Страница 149: ...ts 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 ...

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Страница 151: ...e Screen Saver push any front panel button to activate the screen TEST CHAMBER PROBLEMS 1 Test Chamber Microphone does not Level a Check your mic calibration b Is the mic properly plugged into the instrument c Are all connections clean and tight d Is the mic cable loose broken cut or worn or frayed e Make sure everything is out of the test chamber except the mic when trying to Level See Operator s...

Страница 152: ...g out of the speaker If not check cable and connections f Make sure the distance from the speaker to the ref mic during leveling is about 12 max 18 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 ...

Страница 153: ...ided 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 ...

Страница 154: ...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 ...

Страница 155: ... HTL HL to UCL HL prediction table from Pascoe 1988 Table 4 HTL UCL HTL UCL dBHL HL dBHL HL 0 97 65 114 5 99 70 115 10 99 75 117 15 98 80 120 20 97 85 120 25 101 90 124 30 102 95 130 35 101 100 127 40 103 105 133 45 105 110 134 50 107 115 137 55 108 120 140 60 110 This table is only used when the age is not specified in the Target Screen For age specific conversion values contact Frye support at s...

Страница 156: ...FONIX FP40 Portable Hearing Aid Analyzer ...

Страница 157: ... 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 targe...

Страница 158: ...t 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 Gagné 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 ...

Страница 159: ... Size Battery Chemistry Impedance Voltage NONE 0V 1 OHMS 0 0V 10A 230 ZINC AIR 10 1 3V 312 SILVER 10 1 5V 312 MERCURY 8 1 3V 312 ZINC AIR 6 1 3V 13 SILVER 8 1 5V 13 MERCURY 8 1 3V 13 ZINC AIR 6 1 3V 76 SILVER 5 1 5V 675 MERCURY 5 1 3V 675 ZINC AIR 3 5 1 3V 401 MERCURY 1 1 3V AA 1 1 5V LOW BAT 1 0V 10 1 0V 5 ZINC AIR 10 1 3V ...

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Страница 161: ...r 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 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 testi...

Страница 162: ...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 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 s...

Страница 163: ...arm 9 Specifications 125 Spectrum Mode 117 SPL measurements 90 92 SPL Mode 145 SPL Screen 92 SSPL 90 Screen 103 Storage compartments 141 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 W Warranty 16 ...

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