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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.
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Summary of Contents for Frye FONIX FP40
- Page 1 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.
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Page 3: Table Of Contents
Table of Contents Chapter 1: Introduction 1.1 Description ............1 1.2 Hardware History . - Page 4 3.3 Hearing Aid Setup ........
- Page 5 3.4.6 Viewing harmonic distortion........45 3.4.7 Viewing battery current drain.
- Page 6 Chapter 5: Real-Ear Measurements 5.1 Preparation for Real-Ear Measurements ....... . . 73 5.1.1 Setting up the analyzer for testing .
- Page 7 5.8 Miscellaneous ........... . 107 5.8.1 Single frequency response .
- Page 8 Crawley West Sussex RH109TT England Otherwise, please report all safety-related concerns to: Frye electronics, Inc. P .O. Box 23391 Tigard, OR 97281-3391 Frye Electronics is a Registered Firm of British Standards Institution, and we conform tothe ISO 13485 standard viii...
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Page 9: Chapter 1: Introduction
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. -
Page 10: Features & Options
1.3 Features & 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. -
Page 11: Probe Option
(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. -
Page 12: Id Option
HA-1 coupler. See Section 3.6 for more details. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 13: Accessories
1.4 Accessories The standard and optional accessories 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. HA-2 2-cc Coupler Dimensions per requirements of ANSI S3.7 for testing ear level, eyeglass and body aids. -
Page 14: Optional Accessories
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... -
Page 15: External Telecoil
6040 Sound Chamber For control of external noises. Open Ear Coupler Non-standard coupler used for realistic testing of open ear hear- ing 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. -
Page 16: Real-Ear Accessories
• 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 M200 Probe Microphone Telewand For checking the telecoil response per ANSI-S3.22-1996 Mounting Sleeves (L) for reference mic (R) for probe mic FONIX FP40 Portable Hearing Aid Analyzer... - Page 17 Wedge Style Ear Hook Standard size Holds probe and reference microphones during real ear testing. Improved design eliminates need for Velcro headband. 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...
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Page 18: Layout & Controls
LEVEL AMPLITUDE Figure 1.5.1A—FP40 Front Panel Function Buttons POWER RESET LEVEL AMPLITUDE Figure 1.5.1B—FP40-D Front Panel Function Buttons START/ STOP FREQUENCY START/ STOP FREQUENCY FONIX FP40 Portable Hearing Aid Analyzer CONTRAST DATA/ PRINT GRAPH FEED CONTRAST DATA/ PRINT GRAPH FEED... -
Page 19: Front Panel Buttons
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. -
Page 20: Front Panel Knobs
Serial Interface Nine pin D jack for RS232 connection and laser printer connection. CE Mark 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. -
Page 21: Right Side Mounted Jack And Module
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. -
Page 22: Fp40 Setup
5. Attach the printer connector to the “RS232” side of the serial-to-parallel converter. 6. Attach the printer cable to the “Parallel” side of the serial-to-parallel converter. 7. Attach the other end of the printer cable to your external printer. SERIAL-TO-PARALLEL CONVERTER EXTERNAL PRINTER FONIX FP40 Portable Hearing Aid Analyzer... -
Page 23: Connecting The Line Cord
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 local Frye representative first, since many problems can be fixed without returning the whole unit. -
Page 24: Emergency Shutdown
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. -
Page 25: Chapter 2: General Operation
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. -
Page 26: Making Selections
To switch between Partial Menu mode and Full Menu mode, select MENU TYPE in the General Setup Menu. Choose between FULL and PARTIAL. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 27: Using Function Keys
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.”... -
Page 28: Customizing The Function Keys
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. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 29: Source Types
Speech ICRA signals. The type of source you should choose 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. -
Page 30: Pure-Tone Settings
This choice is allowed because some hearing aid circuits take a longer time than oth- ers to adjust to changes in amplitude or frequency. If the measurement is made too quickly, an arti- fact in testing will be created. -
Page 31: Harmonic Distortion
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. -
Page 32: Noise Reduction
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. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 33: Composite Source Levels
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. Figure 2.4.2.4—Composite signal with an amplitude of 70 dB SPL RMS... -
Page 34: Display Mode
(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. - Page 35 To turn on the battery current drain measurement in the Main Coupler Screen: 1. Press F1, MENU, from the Main Coupler Screen. 2. Select BATTERY DISP in the third column of the screen, under COUPLER SETTINGS. 3. Press START/STOP to toggle ON. 4.
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Page 36: Using The Data Button
This makes external speakers convenient for clinicians who don’t move their analyzers around often. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 37: Printing
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. -
Page 38: Using An External Printer
Some external printers, both black & 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 FONIX FP40 Portable Hearing Aid Analyzer... -
Page 39: Printing A Label
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 •... -
Page 40: The Opening Screen
If the fuel gauge is halfway between E and F, you have approximately half the battery time left, and so on. FONIX FP40 Portable Hearing Aid Analyzer... - Page 41 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.
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Page 43: Chapter 3: Coupler Measurements
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. -
Page 44: Viewing A Composite Display
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... -
Page 45: Leveling Without The Reference Microphone (Standard)
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... -
Page 46: Saving The Leveling Information
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. -
Page 47: Setting Up A Bte
HA-2 2-cc coupler. 4. Snap the ear level adapter 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. - Page 48 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...
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Page 49: Setting Up A Body Aid
1. Adjust the tone and gain 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. -
Page 50: Frequency Responses
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 •... -
Page 51: Taking The Measurement
(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. -
Page 52: Viewing Multiple Measurements
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. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 53: Taking A Three Frequency Average
3.4.5 Taking a three frequency average To take the three frequency average of a hearing aid, you use the AVG feature. 1. Press F1 to enter the General Setup Menu. 2. 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. -
Page 54: Viewing Battery Current Drain
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. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 55: Digital Aids
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. -
Page 56: Testing With Digital Speech
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. -
Page 57: 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. -
Page 58: Preparing For The Measurement
1. Set up your analyzer so that the speaker is in the upright position. See Section 5.1.1.2. 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. -
Page 59: Taking The Reverse Measurement
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. -
Page 60: The Cic Option
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. -
Page 61: 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. - Page 62 #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. FONIX FP40 Portable Hearing Aid Analyzer...
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Page 63: Chapter 4: Automated Test Sequences
See Section 4.6 for more information. 4.1 ANSI S3.22-2003 The ANSI S3.22 standard is the FDA’s 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 standard. -
Page 64: Setting Up The Aid For Testing
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. - Page 65 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 to run an input/output (I/O) curve at this frequency.
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Page 66: Running The Test Sequence
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. -
Page 67: Ansi S3.22-1996
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: •... -
Page 68: Setting Up The Analyzer For Testing
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... -
Page 69: Running The Test Sequence
9. Use F5 to turn ON or OFF the telecoil measurement. The ANSI 96 telecoil measurement requires the Telewand. 10. Press DATA/GRAPH if you are testing an AGC aid. This will change the function key labels. Otherwise, skip to step 14. 11. -
Page 70: Viewing The Results
14. STS-SPLITS: 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 Figure 4.2.4—ANSI 96 results FONIX FP40 Portable Hearing Aid Analyzer... -
Page 71: Ansi S3.22-1987
Note: If you are testing a digital aid, you should usually select AGC for this setting. However, ask the hearing aid manufacturer for guidance. 2. Press F3 to select the last frequency of the three frequency average used in the test sequence. -
Page 72: Running The Test Sequence
1. SSPL90: Output measurement at 90 dB SPL 2. RESP50 (or 60): Response measurement at 50 (or 60) db SPL 3. NR: Noise reduction used in tests 4. SPA/HFA: Frequencies used for the three frequency average FONIX FP40 Portable Hearing Aid Analyzer... -
Page 73: Ansi S3.42-1992
“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. -
Page 74: Setting Up For The Test
6. 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. 7. Press START/STOP to complete the test sequence. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 75: Viewing The 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. -
Page 76: Setting Up The Analyzer For Testing
Note: The equivalent input noise measurement is difficult without a very quiet environment, especially with low gain aids. 7. 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... -
Page 77: Running The Test Sequence
4.5.3 Running the test sequence 1. Level the sound chamber if necessary. See Section 3.2 for details. 2. Set up the aid for testing. See Section 4.5.1. 3. Close the sound chamber. 4. Press START/STOP when you are ready to begin the test. 5. -
Page 78: 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 expanded the test to also include the most useful measurements from ANSI 87/96. -
Page 79: Running The Test Sequence
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 the measurement. -
Page 80: Acic
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. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 81: Chapter 5: Real-Ear Measurements
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. -
Page 82: To Set Up The Internal Sound Field Speaker
• 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. interlocking stop plates FONIX FP40 Portable Hearing Aid Analyzer speaker jack pop-up speaker post... - Page 83 speaker jack recessed channel 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.
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Page 84: To Set Up An External Sound Field Speaker
(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. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 85: To Place The Earhook And Reference Microphone
Top 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. -
Page 86: To Insert The Probe Tube
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. Figure 5.1.2.3A—Marking the probe tube FONIX FP40 Portable Hearing Aid Analyzer... -
Page 87: To Level The Sound Field
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. -
Page 88: 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. FONIX FP40 Portable Hearing Aid Analyzer... - Page 89 “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.
- Page 90 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...
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Page 91: Creating A Target
Figure 5.2.1—The Target screen 1. Insertion gain target graphical display. 2. Fitting rule used in generation of the target. 3. Chosen ear. 4. UCL status: predicted or measured. 5. Age of client. 6. Frequency column. 7. HTL data for corresponding frequencies. 8. -
Page 92: Setting The Default Target
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. -
Page 93: Creating Your Own Target
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. -
Page 94: Viewing The Insertion Gain 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. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 95: Taking An Aided Response
4. Select the desired source with F7. Use either NORM (for a pure-tone sweep), or COMP (for a composite signal). 5. Use the AMPLITUDE knob to select the desired amplitude. Unaided measurements are usu- ally made with 65 or 70 dB SPL. 6. -
Page 96: Other Functions
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. -
Page 97: Testing Open Fit Hearing Aids
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. -
Page 98: 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. -
Page 99: Understanding The Specifics Of Dsl
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. -
Page 100: Viewing The Spl Screen
Figure 5.4.3—SPL Testing screen 5.4.4 Taking the SPL measurements 1. 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... - Page 101 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.
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Page 102: Audibility Index (Ai)
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. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 103: Viewing The Ai Display
5.5.1 Viewing the AI display See Figure 5.5.1 for a picture of the Audibility Index display. 1. dB HL graph for unaided and aided audiogram responses 2. Aided audiogram responses (from insertion gain measurements) 3. Insertion gain target displayed in dB HL 4. -
Page 104: Performing Ai Measurements
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. -
Page 105: To Perform The Coupler Measurement
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. -
Page 106: To Perform The Real-Ear Measurement
11. 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. FONIX FP40 Portable Hearing Aid Analyzer... - Page 107 Probe mic Lapel clip I N S E P H O E A R External speaker jack Microphone jack Figure 5.6.1.2A—Setup for real-ear part of the RECD Real-Ear Measurements Foam eartip I N S E R T E A R P H O WITH FOAM EARTIP I N S...
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Page 108: Performing Coupler Measurements To A Dsl Target
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. -
Page 109: Coupler Prescription (Non Dsl)
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. -
Page 110: Viewing The Target 2-Cc Screen
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 modification box will disappear from the screen. Figure 5.7.1—Target 2-cc screen FONIX FP40 Portable Hearing Aid Analyzer... -
Page 111: Taking The Fog Measurement
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. -
Page 112: Taking The Sspl 90 Measurement
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. 5. Press START/STOP to start the 90 dB pure-tone sweep. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 113: Checking An Aid Against A Prescription
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... -
Page 114: Accounting For Venting Effects
No correction for BTE, because the reference microphone is precisely 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. -
Page 115: Miscellaneous
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. -
Page 116: Reset Level
3. Use the START/STOP button to select the curve you want to convert to its numerical data. The selections available are dependent upon the TEST TYPE. 4. Press F1 to return to the real-ear measurement screen. FONIX FP40 Portable Hearing Aid Analyzer... -
Page 117: Body, Cros, And Bi-Cros Aids
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. -
Page 118: Testing Cros And Bicros Aids
FP40 to be UNLEVELED with the reference micro- phone OFF, the rest of the measurements in this section call for the FP40 to be LEVELED with the reference microphone ON. GOOD 12" PROBE MIC GOOD 12" PROBE MIC FONIX FP40 Portable Hearing Aid Analyzer SPEAKER SPEAKER... -
Page 119: How Well The Aid Overcomes The Head-Baffle Effect
• Reference microphone over pinna of “bad” ear • Probe microphone inside ear canal of better ear • Hearing aid in better ear, on, set at use gain • Transmitter on bad side turned off • Loudspeaker at 90º, 12 inches from bad ear B. -
Page 120: Overall Insertion Gain
• Probe microphone inside unoccluded ear canal of bet- ter ear • Loudspeaker at 0º, 12 inches from bridge of nose GOOD PROBE MIC 12" SPEAKER BETTER PROBE MIC 12" SPEAKER FONIX FP40 Portable Hearing Aid Analyzer REFERENCE MIC REFERENCE MIC... -
Page 121: Insertion Loss To The "Good" Ear (Cros)
Same setup as A, except • Earmold in place in good ear • 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. -
Page 122: Fm Systems
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 showing the directional advantage. -
Page 123: Forward Measurement
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... -
Page 125: Chapter 6: Spectrum Analysis
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. - Page 126 6. Use F3 to select AIDED 1. 7. Place the hearing aid in the ear. The aid should be turned off. 8. Push the START/STOP button. Instruct the client to sustain the vowel sound “ee.” 9. While the “ee” is still sounding, and once the curve on the screen has stabilized, press START/STOP .
- Page 127 3: R PPLICATION IDED 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: 1.
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Page 129: Chapter 7: Telecoil Testing
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. -
Page 130: Setup With The Telewand
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. -
Page 131: Environmental Magnetic Fields
7. Press F2 to turn ON the telecoil feature. 8. 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. -
Page 132: Testing
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 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. -
Page 133: Appendix A: Specifications
Appendix A: Specifications SINE SIGNAL Frequencies Normal Sweep Frequencies Fast Sweep Frequencies Short Sweep Warbled Sinewave Amplitude (RMS) Harmonic Distortion COMPOSITE SIGNAL (optional) Frequencies Amplitude Crest Factor BATTERY CURRENT MEASUREMENT Measurement Range Current Limit Accuracy Resolution Simulated Battery Types Battery Voltages Supplied Specifications 1/12 octave frequencies from 200 to 8000 Hz, closest 100 Hz, within 1 %: 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3,... -
Page 134: Remote Operation
40 VA at 120 VAC, 60 Hz input, normal operation UL approval; UL 554 approval upon request 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... - Page 135 Auto Shutdown Battery Charger DISPLAY SCREEN 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 EXTERNAL CONTROLS, INDICATORS AND CONNECTORS Front Panel Buttons Rotary Controls A/C Power Switch...
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Page 136: Safety Approval
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. -
Page 137: Appendix B: 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. - Page 138 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. Push F4 CAL MIC(S). Figure B-4 FONIX FP40 Portable Hearing Aid Analyzer...
- Page 139 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.
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Page 141: Appendix C: History Of Changes
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 & Coupler. Target 2cc FOG & SSPL90. Easy-to-read Double-Size Characters. -
Page 143: Appendix D: Custom Recd Test
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 OFF. - Page 144 On a 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. FONIX FP40 Hearing Aid Analyzer...
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Page 145: Appendix E: The Fonix Cic Option
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. - Page 146 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.
- Page 147 CIC CORRECTION FACTORS -8.7 -0.95 -8.6 -0.5 -8.7 -0.2 -8.75 -8.9 -8.8 -8.2 -6.55 1000 1100 -5.4 1200 1.65 -4.95 1300 -4.2 1400 -3.6 1500 -3.3 1600 -2.8 1700 -2.3 1800 1900 2.85 -1.7 2000 2.91 -1.2 2100 The FONIX CIC Option 2200 4200 2300...
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Page 149: Appendix F: Storage Compartments In The Fp40
Appendix F: Storage Compartments in the FP40 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. -
Page 151: Appendix G: Troubleshooting Guide
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. -
Page 152: Printer Does Not Work
3. A bump or peak in the low frequency response curve 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. -
Page 153: Appendix H: Probe Spl Mode Description
• To convert the HTL and UCL from HL to SPL: Add the corrections in Table 3. • To predict UCL ’s (HL) given the HTL (HL): Use Table 4 to convert from HTL to UCL. FONIX FP40 Portable Hearing Aid Analyzer... - Page 154 12.3 5600 16.0 12.5 5700 16.1 12.7 5800 16.3 13.0 5900 16.4 13.2 6000 16.6 FONIX FP40 Portable Hearing Aid Analyzer FONIX FP40 Portable Hearing Aid Analyzer FREQ GAIN (Hz) 6100 6200 6300 6400 6500 6600 6700 6800 6900 7000...
- Page 155 HTL(HL) to UCL(HL) prediction table from Pascoe(1988) Table 4 dBHL dBHL FONIX FP40 Portable Hearing Aid Analyzer This table is only used when the age is not specified in the Target Screen. For age-specific conversion values, contact Frye support at...
- Page 156 FONIX FP40 Portable Hearing Aid Analyzer...
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Page 157: Appendix I: Dsl Programming Notes
Nevertheless, the DSL programming in the FP40 is found in the Probe sec- tion. - Page 158 (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.
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Page 159: Appendix J: Battery Simulator Impedances
Battery Chemistry NONE 10A/230 ZINC-AIR SILVER MERCURY ZINC-AIR SILVER MERCURY ZINC-AIR SILVER MERCURY ZINC-AIR MERCURY LOW BAT 1.0V ZINC-AIR FONIX FP40 Portable Hearing Aid Analyzer Impedance Voltage 1 OHMS 0.0V 1.3V 1.5V 1.3V 1.3V 1.5V 1.3V 1.3V 1.5V 1.3V 1.3V 1.3V 1.5V... -
Page 161: Index
Index 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 S3.22-1996 55, 59 results 58, 62 ANSI S3.22-2003 55 ANSI S3.42-1992 55, 65... - Page 162 RS232 Option 4, 8 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...
- Page 163 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 Target 2-cc 102...
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