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RM500SL
®
User's Guide Version 3.12
March 2015
hearing aids and is approximately true for insert earphones with the supplied foam tips. The acoustic impedance
of insert earphones drops if the foam tip is replaced by an earmold or the tubing that forms part of the HA-2
coupler. At some frequencies, for BTE hearing aids with their earhooks and earmold tubing (or the HA-2 coupler
tubing), the acoustic impedance approaches that of an adult ear and falls below that of a child's ear. Each of
these sound sources will produce a different RECD and, if the acoustic impedance of the sound source differs for
the ear canal and 2cc coupler measurements, further RECD differences will result.
Audioscan uses the HA-2 (BTE) coupler for the transducer calibration, then our RECD transducer and either a
foam eartip or the client's personal earmold for the real ear measurement. When a foam tip is used, we subtract
the two measurements to get an HA-1 RECD. When an earmold is used on the ear measurement we first subtract
an average earmold (referenced to our RECD transducer) to obtain an HA-1 RECD, then we add the same
average earmold (referenced to an ER3A) to obtain an HA-2 RECD with earmold effects retained.
When the entered HL transducer is Insert + foam, we apply an HA-1 foam tip RECD during the HL-to-SPL
transform to correct the thresholds measured in a non-average ear canal. When the HL transducer is Insert +
Mold we apply the HA-2 referenced RECD with earmold effects retained to the HL-to-SPL transform.
In Test-box Speechmap (simulated REM) we apply the HA-1 RECD to the coupler measurment for ITE, ITC,
CIC, RIC instruments, and also to BTE instruments when BTE + mold has been selected (and personal earmold
used in the measurement). When the instrument type is set to BTE (HA-2) the HA-2 referenced RECD is
applied.
RECD values and are stored, displayed, and printed referenced to the HA-1 coupler. Imported data from
software versions 3.10.39 and earlier will be HA-2 referenced and will be converted to HA-1 referenced data for
use, storage, and display. Subsequent printing, saving, or export will show the converted HA-1 referenced values
only.
If you use insert ear phones for audiometry OR if you verify using the test box, you should measure RECD
(preferred) or use age-related average RECD.
71
- Audioscan RM500SL 1
- User's Guide 3.12 1
- Table of Contents 2
- 1 About RM500SL 6
- SAFETY WARNINGS and NOTICES 7
- Environmental safety 7
- March 2015 10
- Electronic User’s Guide 11
- 2 Getting Started 13
- General care instructions 14
- Microphone care 15
- Battery pill use and care 15
- 3 General Operation 18
- Keypad keys 19
- Menus, lists and buttons 20
- Screen messages and Help 21
- Software updating 21
- 4 General Setup 22
- 5 Networking 24
- NOAH Service Port 25
- Testing the NOAH service port 26
- 6 Single computer connection 27
- Local printer setup 30
- Printing to USB memory 31
- Network printer setup 32
- Printing to a network file 32
- Storing and restoring data 33
- Data storage using NOAH 35
- 8 Test Box Measures - Setup 36
- 1996 or 2003 ANSI standard 37
- ANSI test frequencies 37
- Test box calibration facts 37
- 9 ANSI Hearing Aid Tests 42
- ANSI test results 44
- ANSI input-output curves 44
- ANSI telecoil terminology 45
- Telecoil test results 46
- 10 Other Test Box Measures 48
- Multicurve procedure 49
- Multicurve results 49
- Battery drain test 50
- Manual control procedure 50
- 11 Sensory loss simulator 53
- 12 On-Ear Measures - Setup 54
- Max TM SPL setup 56
- ABR nHL to eHL setup 57
- Positioning the client 57
- Positioning the probe tube 58
- SPL or HL scale 60
- Hide or show on-ear curves 61
- On-ear feedback test 62
- On-ear noise reduction test 62
- On-ear manual control 63
- 15 Occlusion Effect Test 65
- 16 RECD measurement 66
- Measure RECD 67
- RECD results 68
- ANSI S3.46(2013) RECD 69
- RECD protocols 69
- RECD facts 70
- 17 Insertion Gain 72
- Insertion gain in HL 73
- Audiometric data entry 73
- REUR measurement procedure 74
- REAR measurement procedure 75
- 18 Speechmap 77
- DSL 5.0 changes 78
- NAL-NL1 in Speechmap 78
- NAL-NL2 in Speechmap 78
- Camfit in Speechmap 79
- Using Speechmap 79
- Speechmap Setup 80
- Screen tour - aided screen 82
- On-ear or Test box mode 82
- Assessment data entry 87
- Assessment data choices 88
- Open fittings in Speechmap 91
- FM fitting and verification 93
- Speechmap stimuli 95
- Stimulus levels 95
- Microphone location effects 96
- Deep insertion compensation 97
- Speech signal analysis 97
- 21 Troubleshooting 98
- Test box speaker overdriven 99
- Invalid on-ear calibration 101
- Barcode scanner malfunction 101
- 22 Technical 104
- Specifications 104
- Sensory Loss Simulator 105
- 23 Glossary 107
- 24 References 112
- 25 Appendix 1 115
- 26 Appendix 2 118
- 1 Introduction 119
- 2 The test signals 119
- 2.1 Narrow-band signals 120
- 2.2 Broad-band signals 120
- 2.2.3 Real-speech signals 122
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