FONIX® 8000 - Frye Electronics

More documents

Recommendations

Info

146 FONIX <strong>8000</strong> Hearing Aid Test System Figure 7.0: A Completed ISTS Test 7.1 Hearing Aid Setup This section describes how the hearing aid should be programmed and set up in the sound chamber. The sound chamber should be leveled (Section 3.2), and the hearing aid should be arranged in the test chamber in the usual way (Section 3.3). BTE hearing aids should be tested with the HA-2 coupler and canal hearing aids with the HA-1 coupler. The IEC 60118-15 standard specifies that hearing aids with the receiver in the canal or using thin coupling tubes should use the HA-1 coupler. All settings of the hearing aid should be set to end-user settings, including noise reduction algorithms, feedback suppression systems, echo cancellation, etc. Features like frequency transposition should be disabled since they may give measurement results that are difficult to interpret. It is recommended to program the hearing aid for a closed vent since actual measurements will take place using a coupler and no venting. Directional hearing aids should be set to omni-directional mode. The hearing aid should be programmed for the patient’s measured audiogram. However, if there is no patient yet, you can use one of the following audiograms found in Table 7.1 for flat and moderately sloping audiograms or Table 7.2 for steeply sloping audiograms. Make sure you make a note of which audiogram you used to program the hearing aid for reference purposes later.
The ISTS Test 147 No HL 250 Hz 375 Hz 500 Hz 750 Hz 1000 Hz 1500 Hz 2000 Hz 3000 Hz 4000 Hz N1 16 10 10 10 10 10 10 15 20 30 40 N2 31 20 20 20 22.5 25 30 35 40 45 50 N3 46 35 35 35 35 40 45 50 55 60 65 N4 63 55 55 55 55 55 60 65 70 75 80 N5 76 65 67.5 70 72.5 75 80 80 80 80 80 N6 89 75 77.5 80 82.5 85 90 90 95 100 100 N7 103 90 92.5 95 100 105 105 105 105 105 105 Table 7.1: Standard audiograms for flat and moderately sloping group No HL 250 Hz 375 Hz 500 Hz 750 Hz 1000 Hz 1500 Hz 2000 Hz 3000 Hz 4000 Hz S1 23 10 10 10 10 10 10 15 30 55 70 S2 49 20 20 20 22.5 25 35 55 75 95 95 S3 63 30 30 35 47.5 60 70 75 80 80 85 Table 7.2: Standard audiogram for the steep sloping group 7.2 The ISTS Test Performing the ISTS Test is very straightforward. 1. Enter the ISTS Test screen by selecting [F3] Advanced Coupler from the Opening Screen and then pressing [F7] ISTS Noise. 2. Set up the hearing aid for testing as described in Section 7.1. 3. Use the up-down arrow keys to adjust the source level, if desired. The default is 60 dB SPL. 4. Use the [F5] key to choose the source type. Normally, this will be the ISTS Wave, but you can also choose Pink Noise or White Noise. 5. Press [MENU] and adjust the Test Period, if desired. This changes the measurement time for the test. Choose between 10, 20 and 45 seconds. Keep in mind actual test time is longer. Press [MENU] again to close the local menu. 6. Press [START]. The ISTS test will run and four curves will be displayed when the test is complete. These curves represent the LTASS (long term average speech spectrum), the 99, 65 and 30 percentile curves. This means that in the 99 percentile curve, 99 percent of the measured response is below this line. In the 65 percentile curve, 65 percent of the measured response is below this line. Similarly, in the 30 percentile curve, 30 percent of the measured reponse is below this line. 7. Use [F2] to select Crv 4 and repeat if desired. Three separate tests can be measured and displayed together using a total of 12 different curves. 6000 Hz 6000 Hz
Page 1:
FONIX® 8000 Hearing Aid Test Syste
Page 4 and 5:
ii FONIX 8000 Hearing Aid Test Syst
Page 6 and 7:
iv FONIX 8000 Hearing Aid Test Syst
Page 8 and 9:
vi FONIX 8000 Hearing Aid Test Syst
Page 10 and 11:
2 FONIX 8000 Hearing Aid Test Syste
Page 12 and 13:
Page 14 and 15:
Page 16 and 17:
Page 18 and 19:
10 FONIX 8000 Hearing Aid Test Syst
Page 20 and 21:
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
Page 28 and 29:
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Page 84 and 85:
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
Page 102 and 103:
Page 104 and 105: 96 FONIX 8000 Hearing Aid Test Syst
Page 106 and 107: 98 FONIX 8000 Hearing Aid Test Syst
Page 108 and 109: 100 FONIX 8000 Hearing Aid Test Sys
Page 153: Chapter 7 145 The ISTS Test The IST
Page 158 and 159: 150 FONIX 8000 Hearing Aid Analyzer
Page 204 and 205:
196 FONIX 8000 Hearing Aid Analyzer
Page 207 and 208:
Appendix A 199 Specifications ACOUS
Page 209:
Specifications 201 Size: 11.5"W x 1
Page 212 and 213:
204 FONIX 8000 Hearing Aid Test Sys
Page 214 and 215:
Page 217 and 218:
Appendix C 209 Calibration There ar
Page 219:
Calibration 211 6. Thread the probe
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
Page 228 and 229:
Page 231 and 232:
Appendix G 223 Glossary of Terms AG
Page 233 and 234:
Glossary of Terms for the FONIX 800
Page 235 and 236:
Glossary of Terms for the FONIX 800
Page 237:
Appendix H 229 The FONIX Keyboard A
Page 240 and 241:
Page 242:
show all

FONIX® 8000 - Frye Electronics

Create successful ePaper yourself

Delete template?

Save as template?