Page 2: Table Of Contents
Table of Contents 1 About Verifit..................................6 Product description................................6 Accessories..................................12 Associated items and supplies............................12 SAFETY WARNINGS and NOTICES..........................13 Environmental safety................................14 Declaration of Electromagnetic Compatibility (EMC).....................14 Warranty, Trademarks, Acknowledgments........................15 EC Declaration of Conformity............................17 Electronic User’s Guide..............................18 How to Avoid Undesirable Side Effects..........................18 2 Getting Started..................................20...
Page 3 Verifit ® User's Guide Version 4.8 © November 2016 On-ear or Test box mode..............................50 SII calculation in Speechmap.............................51 Using custom stimuli in Speechmap..........................51 Creating WAV files for Speechmap..........................53 8 Speechmap Fitting Procedures............................55 Speechmap screen choices..............................55 Data entry...................................57 Fitting to targets for soft speech............................57 Fitting to targets for average speech ..........................58...
Page 4 Verifit ® User's Guide Version 4.8 © November 2016 15 Test Box Measures - Setup..............................93 Test box screen...................................93 Format....................................95 Scale....................................95 Hide or Show test box curves.............................95 ANSI test frequencies.................................96 Test box calibration facts..............................97 Calibrating test box reference microphone........................97 Calibration check for coupler microphone........................98 Coupling for binaural/wideband tests..........................99...
Page 5 Verifit ® User's Guide Version 4.8 © November 2016 Printing results..................................126 Printing setup..................................126 Printer connection................................127 Printer types..................................128 HP printer..................................128 Custom printer..................................128 File output..................................129 Page setup..................................129 Windows-shared printers and folders..........................131 Network printer.................................133 Web browser screen capture............................133 Session setup..................................134 Storing and restoring session files............................135 21 Troubleshooting................................137...
Page 6: About Verifit
User’s Guide. Note that the User's Guide may be viewed on the Verifit at any time by pressing <Help>. (For long Help pages, use the mouse to switch between the Help index and the Help page, and to scroll through the page).
Page 7 Verifit ® User's Guide Version 4.8 © November 2016 Component Description External power supply connected to a hospital grade power cord (in North America) or a country-specific power cord (international markets) . Electrical supply input requirement: 100 – 240 Vac 47 –...
Page 8 Verifit ® User's Guide Version 4.8 © November 2016 Component Description WRECD transducer used to measure the wideband real-ear to coupler difference (WRECD) useful in estimating the sound level produced in an individual ear from measurements in a coupler Foam eartips for measuring WRECD. The package contains: Qty 5 ER3-14A adult foam eartips •...
Page 9 Verifit ® User's Guide Version 4.8 © November 2016 Component Description Tele-test handset used to provide an inductive stimulus for simulating operation with a telephone in Speechmap and for performing ANSI TMFS test. Audioscan update USB stick Quickstart setup guide...
Page 10 Verifit ® User's Guide Version 4.8 © November 2016 Test Box Hearing instrument test (HIT) acoustically-treated binaural test box which houses a telecoil test loop, 3 loudspeakers and connections for: two reference microphones, • binaural coupler microphone • battery pill substitutes •...
Page 11 Verifit ® User's Guide Version 4.8 © November 2016 Component Description 0.4cc wideband couplers for Speechmap and all binaural/ wideband tests. HA-1 (ITE) 2cc coupler (1) NOTE: for ANSI/IEC tests only. Not to be used for Speechmap. HA-2 (BTE) 2cc coupler (1) NOTE: for ANSI/IEC tests only.
Page 12: Accessories
VA-134 Probe dock extension cable (375cm / 12 ft.) for use with the probe dock ® VA-201 NOAH module allows a networked PC running NOAH to exchange data with Audioscan analyzers RE-791 Binaural coupler microphone adapter for use with B&K 4231 or Quest QC10/20 calibrators (1 in.)
Page 13: Safety Warnings And Notices
WARNING: To avoid the risk of electrical shock, use only the power supply and power cord supplied with the Verifit and connect it only to a grounded (protectively earthed) electrical outlet. WARNING: To allow electrical power to be rapidly disconnected in the event of an emergency, position the power supply in an accessible location so that the power cord may be quickly disconnected.
Page 14: Environmental Safety
Medical electrical equipment needs special precautions regarding EMC and needs to be installed and put into service according to the following information: The Verifit should not be used adjacent to or stacked on other equipment. If this is necessary, its operation •...
Page 15: Warranty, Trademarks, Acknowledgments
User's Guide Version 4.8 © November 2016 Guidance and manufacturer’s declaration - electromagnetic emissions The Verifit is intended for use in the electromagnetic environment specified below. The user of the Verifit should assure that it is used in such an environment.
Page 16 NAL-NL2 is used under license from Hearworks Pty Ltd, Australia. Software licenses: Audioscan distributes selected software components under various open source licenses. These licenses generally give you the right to copy and change the affected component's software source code. For details, see...
Page 18: Electronic User's Guide
Foxit Reader is required to view the User’s Guide. Except for some additional reference material, the information in the User's Guide is available to you on the Verifit at any time by right-clicking and selecting A printable User’s Guide is on the Audioscan update stick supplied with the instrument. This User's Guide will be updated each time you download new software from www.audioscan.com to the Audioscan update stick.
Page 19 In order to ensure that all of the safety features work optimally you must ensure that the power cord is plugged into a grounded outlet. Any line-powered peripherals connected to Verifit must comply with UL/IEC 60601-1 OR comply with UL or IEC or ISO safety standards for such equipment, AND a) be operated from an isolating transformer complying with UL/IEC 60601-1, OR b) be kept at least 1.8m (6 ft..)
Page 20: Getting Started
Office setups 1. Conventional. In the standard setup the Verifit display unit and test box are placed either side by side or co- linear (test box in front) on the same surface. The distance between them is only limited by the test box cable that connects them.
Page 21 MONITOR connector on the rear connector panel. 5. Open the lid of the test chamber by using your thumb to roll the rubber roller toward the front of the Verifit. This is made easier by placing your fingers under the front lip. When sealing the chamber in its closed...
Page 22: Microphone Connection
6. Connect the Verifit power supply (included) to the power connector on the rear connector panel. 7. Connect the power cord (included) from the Verifit power supply to a GROUNDED electrical outlet. In the USA and Canada, this outlet should be marked Hospital Grade.
Page 23 Verifit ® User's Guide Version 4.8 © November 2016 2. Connect the probe microphones to the left (blue) and right (red) connectors on the bottom of the probe dock. The probe microphone modules should be kept in the probe dock when not in use, positioned with the reference microphone ports facing outward.
Page 24: General Care Instructions
The black rubber TRIC (Thin-tube & Receiver In Canal) adapters may be cleaned with disinfectant towlettes if they becomes soiled with use. Audioscan recommends periodic replacement of the blue putty used with the HA-1 coupler to ensure cleanliness. Both couplers and coupler microphone can be wiped down with alcohol wipes as needed.
Page 25: Mouse And Keyboard
Failure to follow operating instructions could place the user or operator at risk. The Verifit may be operated from a mouse or a standard computer keyboard, which may also be used to enter headers and comments on printouts. A USB mouse or keyboard may be plugged directly into any of the USB ports provided.
Page 26 Verifit ® User's Guide Version 4.8 © November 2016 To connect the monitor headphones, insert the headphone plug into the stereo jack on the lower right-hand side of the display unit. In Dual View of most applications the monitor headphones present the left and right microphone signals to the left and right sides of the headphones.
Page 27: External Peripherals
Connectors for external front and back sound field speakers are provided. The VA-111 external speaker with a multipurpose folding stand is available from Audioscan but any small, non-powered 4 - 8 ohm speaker having a smooth frequency response and good efficiency may be used. The rear external speaker is automatically selected when required by a test but the front speaker must first be selected in Setup.
Page 28: General Operation
User's Guide Version 4.8 © November 2016 3 General Operation This section describes the use of a mouse or connected USB keyboard to control the Verifit and to enter data. It also provides instructions for updating the Verifit operating software.
Page 29 Verifit ® User's Guide Version 4.8 © November 2016 The functions of the screen icons and connected keyboard keys are explained in the following table:...
Page 30: Network Connection
Failure to follow operating instructions could place the user or operator at risk. The Verifit includes two options for connecting to a computer network, either through the built-in wireless networking feature, or through an external wired connection. The built-in wireless networking feature requires no additional attachments to the Verifit.
Page 31: Printer Connection
Failure to follow operating instructions could place the user or operator at risk. The Verifit can use printers connected locally through USB, or remotely through a computer network. Connecting a local printer requires inserting the printer's USB cable into any of the five USB connections available on the side or rear of the display unit, as illustrated in the figure below.
Page 32: Menus, Lists And Buttons
Software updating The Verifit software is available on the Audioscan website, www.audioscan.com. After it is downloaded to your computer, it can be installed to your Verifit using a USB memory stick. To update the Verifit: 1.Using your computer, open a browser like Internet Explorer, Firefox, or Chrome and navigate to...
Page 33 3.Double-click the downloaded software. 4.Save the audioscan folder to an appropriate location on your computer, like the desktop. 5.Connect the provided Audioscan update USB stick (or any empty USB stick) to your computer. 6.Double click the audioscan folder, then double click audioscan_update.
Page 34: General Setup
Verifit ® User's Guide Version 4.8 © November 2016 4 General Setup This section covers Date and Time setup, Display settings (including mouse pointer speed setting) and Saving test setup. Date and time setup To set the date and time that appears on printouts and calibration screens: 1.
Page 35 Verifit ® User's Guide Version 4.8 © November 2016 To enable/disable erasing of test levels, stimuli and assessment parameters when Erase data is selected: 1. Press , then click on [Save option] 2. Click [Save test setups on erase data] to toggle between Yes and No.
Page 36: On-Ear Measures - Setup
User's Guide Version 4.8 © November 2016 5 On-Ear Measures - Setup For accurate, repeatable measurements, the Verifit must be properly set up and calibrated, the client must be properly positioned and the probe tube must be properly positioned in the ear canal. Some common terms: Real-Ear Unaided Response (REUR): SPL, or band SPL, in the open (unaided) ear canal for a given stimulus.
Page 37: On-Ear Calibration Facts
It is suggested that a copy of the calibration curves for the probe modules when new be posted near the Verifit for comparison with daily or weekly curves. If there is a drift in calibration with time, the module may need replacement.
Page 38 Verifit ® User's Guide Version 4.8 © November 2016 Position the probe tip over the reference microphone Hold probe dock with microphone to be calibrated facing speaker. Typical calibration curve. Level may be shifted +/- 5dB.
Page 39: Calibration Check For Probe Module
Verifit ® User's Guide Version 4.8 © November 2016 Calibration check for probe module The calibration curve for the probe module is a comparison of the response of the probe microphone (with tube) to the response of the on-ear reference microphone. Any change in the curve indicates a change in one of these microphones (or the probe tube).
Page 40: Max Tm Spl Setup
This Max TM SPL setting will be in effect until you change it. If the limit is exceeded during an on-ear test, the Verifit will terminate the test and display the message 'Max TM SPL Exceeded'. You must then decide to either reduce the maximum output limit of the hearing instrument or increase the Max TM SPL setting following the steps above.
Page 41: Positioning The Probe Tube
Verifit ® User's Guide Version 4.8 © November 2016 1. Choose a quiet location and position the client and the sound field speaker at least 1.5 m (5 feet) away from any hard surfaces. 2. Position the client directly in front of, and facing, the sound field speaker at a distance of 45 to 90 cm (18 to 36 in.) from the center of the head.
Page 42 Verifit ® User's Guide Version 4.8 © November 2016 Probe dock positioned, clipped to client clothing, adjust clip holding probe microphone modules in place. Probe tube insertion: the colored lanyard holds the tube in place and the depth marker is at the intertragal notch...
Page 43: On-Ear Measures Screen Setup
Verifit ® User's Guide Version 4.8 © November 2016 6 On-Ear Measures Screen Setup To accommodate your working preferences, the appearance of On-ear measurement screens may be changed in several ways. On-ear single or dual view Most on-ear screens give you the option of selecting either a single, full-screen view or a dual, side by side view.
Page 44 Verifit ® User's Guide Version 4.8 © November 2016 Hiding a curve does not erase it. To erase curves click on and select one of the Erase options. To hide or show test curve(s) in all other applications: 1. Left-click [Hide/Show].
Page 45: Speechmap
1. DSL 5.0 uses RECD values for ages > 119 months from a different source than for ages up to and including 119 months; Audioscan has used the RECD values for a 119 month old for ages > 119 months so all values come from the same study.
Page 46: Nal-Nl1 In Speechmap
Because it is more accurate to verify a non-linear fitting using the signal for which the procedure was developed, Audioscan converts the NAL-NL1 insertion gain targets to LTASS targets for amplified speech in the Speechmap environment, resulting in Speechmap/NAL- NL1.
Page 47: Using Speechmap
Verifit ® User's Guide Version 4.8 © November 2016 specifies the level-dependent gain required to correct abnormal loudness as modeled by his cochlear hearing loss simulation. It provides two approaches to correcting for the hearing loss: Camfit restoration aims to amplify sounds that are soft, comfortable and loud for a person with normal hearing so that they are soft, comfortable and loud for a hearing aid wearer.
Page 48 Verifit ® User's Guide Version 4.8 © November 2016 manage which stimuli appear on this list by doing the following: Right click and select , then click [Speechmap]. The available Speechmap stimuli are in two columns. The left-hand column contains the MPO stimulus and speech stimuli that have the specific Long-Term Average Speech Spectrum (LTASS) required when matching prescription fitting targets such as DSL, NAL-NL1 or NAL-NL2.
Page 49: Screen Tour - Unaided Screen
Verifit ® User's Guide Version 4.8 © November 2016 Screen tour - unaided screen 1. Max TM SPL (change this in Setup), 2. Estimated UCL, 3. Unaided long-term average speech spectrum (LTASS), 4. Impaired threshold, 5. Normal threshold (MAP), 6. Turn on/off display of unaided speech region, 7.
Page 50: Screen Tour - Aided Screen
Verifit ® User's Guide Version 4.8 © November 2016 Screen tour - aided screen 1. Estimated UCL, 2. 90dB target (for tones), 3. Result of test 3 (MPO), 4. LTASS targets for Test 2, 5. Long term average speech spectrum (LTASS) result of test 2, 6. Speech peaks (99 percentile), 7.
Page 51: Sii Calculation In Speechmap
SII calculation in Speechmap The Verifit calculates a Speech Intelligibility Index (SII) value (in %) for unaided speech at 65 dB SPL and for each aided test. The calculations use the 1/3 octave band method of ANSI S3.5 –1997 without the 160 Hz band and without masking effects with results expressed as a % by multiplying by 100.
Page 52 4. Copy the WAV files from the PC to the top level directory (i.e. not in any folder) of the USB stick. 5. Disconnect the USB stick from the PC and connect it to the USB port on the Verifit.
Page 53: Creating Wav Files For Speechmap
WAV is a commonly used format for digital audio and can be created/edited by nearly all audio editing and recording software. A WAV file has many properties that define the format of the digital audio. When a USB stick is connected to the Verifit, Speechmap looks for files in the top level directory that have the following properties:...
Page 54 Verifit ® User's Guide Version 4.8 © November 2016 Example of user-supplied files, user.wav, user_-4.wav and user_+2.5.wav.
Page 55: Speechmap Fitting Procedures
Verifit ® User's Guide Version 4.8 © November 2016 8 Speechmap Fitting Procedures The Speechmap fitting screen provides a number of choices for inputting and applying audiometric data for the verification of hearing instrument fittings. The procedures in this section assume a familiarity with Test Box Measures - Setup, On-Ear Measures - Setup, On-Ear Measures Screen Setup and Speechmap.
Page 56 Because of standing waves in the 2cc coupler, it is not useful above 8 kHz. The Verifit has adopted a 0.4cc coupler to extend the capabilities of Speechmap Test box to the 1/3 octave band at 12.5 kHz. The term Wideband real-ear to coupler difference (WRECD) has been coined to denote an RECD based on a 0.4cc coupler rather than the HA-1 coupler.
Page 57: Data Entry
Verifit ® User's Guide Version 4.8 © November 2016 and children. If Headphone is selected as the transducer type, adult average values will be used to transform dB HL audiometry to dB SPL. 9. Language: Select from [Non tonal, Tonal]. Determines if NAL-NL2 fitting targets will be adjusted for tonal language.
Page 58: Fitting To Targets For Average Speech
Verifit ® User's Guide Version 4.8 © November 2016 6. Upon completion of a test recording, a colored Aided Audibar shows the SII for the aided soft speech signal. 7. The upper bar in the "1" area, shows the SII for the unaided stimulus at 50 dB SPL (the Unaided Audibar).
Page 59: Adjusting The Maximum Output Level
Verifit ® User's Guide Version 4.8 © November 2016 select. 4. Click to signal average and store a complete passage. Repeat as necessary. 5. Click to stop the test without recording any test data. Upon completion of a test recording, a colored Aided Audibar shows the SII for the aided average speech signal.
Page 60: Open Fittings In Speechmap
Verifit ® User's Guide Version 4.8 © November 2016 but does not exceed the UCL estimates (*) at all frequencies. 3. Click to run and store a complete sweep. Repeat as necessary. 4. In On-ear mode, advise the client to point to the screen if a sound becomes too loud during the test (see Max TM SPL setup).
Page 61: Verifying Frequency Compression/ Frequency-Lowering Hearing Instruments In Speechmap
Verifit ® User's Guide Version 4.8 © November 2016 the hearing instrument and click the Equalize button on the setup poster. After equalization, unmute or turn the instrument on and follow the fitting procedures presented previously in this section. It is necessary to repeat the Equalize procedure whenever the client or nearby objects are moved.
Page 62: Binaural Fitting In Speechmap
Verifit ® User's Guide Version 4.8 © November 2016 1. LTASS Speech-std(F), 2. LTASS Speech4000, 3. LTASS Speech5000, 4. LTASS Speech6300 Binaural fitting in Speechmap When Speechmap is set to Dual view, it is possible to analyze both left and right hearing instruments simultaneously.
Page 63: Cros Fitting In Speechmap
Verifit ® User's Guide Version 4.8 © November 2016 6. Click to measure and store the long-term signal-averaged result. IF the input level at each ear is significantly different, the signal may be repeated twice for accurate results. 7. Click to stop the test without recording any test data.
Page 64: T-Loop Fitting And Verification In Speechmap
Verifit ® User's Guide Version 4.8 © November 2016 [BTE]. An irregular response may be the result of reflections from nearby objects (including the operator) or it may indicate phasing problems in the aids. T-Loop fitting and verification in Speechmap This test allows the T-Loop response of the hearing instrument to be measured so that it can be compared against a 65 dB SPL acoustic response.
Page 65: Tele-Test Fitting And Verification In Speechmap
65 dB SPL acoustic stimulus when positioned close to the hearing instrument. 4. If using an auto-coil feature, a magnet will be required to activate the T-coil function. Move the Audioscan switching magnet from the storage position near the base of the handset to one of the three indicated positions.
Page 66 Verifit ® User's Guide Version 4.8 © November 2016 handset is parallel to the height of the hearing instrument (e.g. like holding a telephone handset or cellphone). 6. Activity on the graph indicates that the hearing instrument is receiving the inductive stimulus.
Page 67: Fm Fitting And Verification
Verifit ® User's Guide Version 4.8 © November 2016 FM fitting and verification FM Offset or FM Transparency method in Speechmap (after Platz 2004) It is assumed that the hearing aid has been set up for optimal audibility and maximum output. See Speechmap screen choices for setup and audiometric data entry.
Page 68 Verifit ® User's Guide Version 4.8 © November 2016 verification procedures, particularly in the cases of extended bandwidth and/or frequency lowering. The following method was developed by Scollie et al. (2016). How were the stimuli created? Instances of /s/ and /sh/ were identified within the ISTS passage, which is based on female speech, to create a target spectrum per phoneme.
Page 69: Speechmap Technical Details
The availability of hearing instruments claiming to provide amplification above 8 kHz, and the reported benefit of those wider bandwidths for young children has motivated Audioscan to extend the bandwidth of the Verifit to 16 kHz which encompasses the 12.5 kHz third octave band. This necessitated several significant advances: 1.
Page 70: Stimulus Spectra
Verifit ® User's Guide Version 4.8 © November 2016 A tone burst (MPO) stimulus provides 128 ms bursts with 128 ms gaps at 1/3 octaves with a level of 90 dB SPL in the test box and 85 dB SPL for on-ear mode.
Page 71 Verifit ® User's Guide Version 4.8 © November 2016 1 / 3 o c t a v e b a n d S P L f o r sp e e c h a t 7 0 d B S P L f r o m B y r n e e t a l ( 1 9 9 4 ) a n d ...
Page 72: Microphone Location Effects
Verifit ® User's Guide Version 4.8 © November 2016 1/3 octave band SPL Add to band SPL for Speech ICRA Pink Loud Calibrated Female Child Noise Noise Voice Chest Boom 57.6 54.6 39.4 53.3 52.2 -3.0 16.5 56.3 53.7 52.7 55.4...
Page 73: Speech Signal Analysis
These levels are determined by calculating a spectrum for each of a series of short time periods within the passage. Historically, time periods of 120, 125 or 128 ms have been used. The Verifit uses a 128 ms time period, resulting in 100 levels (or samples) in each 1/3 octave band for a 12.8 second passage.
Page 74: On-Ear Instrument Measures
On-ear directional test overview The Verifit directional test measures directional performance in real-time and displays simultaneous curves representing stimulus delivered to the front and back of the hearing instrument. It is compatible with all forms of hearing aid processing, including frequency lowering, feedback compensation, and other non-linear algorithms.
Page 75: On-Ear Feedback Test
The PCR measures the degree to which a large amount of power is concentrated at a small number of frequencies in the hearing aid output (see Freed & Soli in References). In the Verifit, the PCR is the ratio of the average power of the dominant frequency components in a 1/12 octave band to the power in the entire band, expressed in dB.
Page 76: On-Ear Noise Reduction Stimuli
Verifit ® User's Guide Version 4.8 © November 2016 1. Refer to On-ear Measures – Setup to prepare the system for use and for proper positioning of the client and the probe tube. 2. Click on in any of the test areas.
Page 77: Sound Level Meter Using On-Ear Microphones
Sound level meter using on-ear microphones The manual control feature enables the Verifit to be used as a sound level meter to perform C-weighted, A- weighted or 1/12th octave analysis of sound as measured by the probe and reference microphones. A and C- weighted measurements are limited to frequencies above 100 Hz and the averaging time and update rate are 384 1.
Page 78: Wrecd Measurement
2. Choose WRECD from the On-ear list on the home menu. 3. Select the RECD coupling method that will be used on the ear. Audioscan software supports both foam eartips and personal earmold, however this choice must be made prior to measurement.
Page 79: Measure Wrecd
Prepare the system for on-ear tests. See Calibration of on-ear probe microphone. 1. Select [WRECD] on the home menu. 2. Select the WRECD coupling method that will be used on the ear. Audioscan software supports both foam eartips and personal earmolds, however this choice must be made prior to measurement.
Page 80: Wrecd Results
Verifit ® User's Guide Version 4.8 © November 2016 curve is negative and unstable in the low frequencies, check the seal of the foam tip. Increase the tip size and/or apply a lubricant to the foam tip to improve the seal. If the WRECD curve deviates more than 10 dB from the average in the 4 - 6 kHz region, check for proper probe placement and possible blockage of the tube by the foam tip or cerumen.
Page 81: Wrecd Protocols
User's Guide Version 4.8 © November 2016 WRECD protocols To facilitate wideband Test box Speechmap, the Verifit 2 requires a WRECD. For threshold corrections in the HL-to-SPL transform, the 0.4cc WRECD is converted to an HA-1 RECD or an HA-2 RECD including tubing effects, based on whether the stated HL transducer is Insert+foam or Insert+mold respectively.
Page 82: Wrecd Facts
RECD differences will result. The Verifit requires RECD data up to 12.5 kHz to facilitate wideband testing, and as a result RECD has been renamed to WRECD (Wideband Real Ear to Coupler Difference) and utilizes the 0.4cc wideband coupler in place of the ANSI 2cc coupler.
Page 83: Occlusion Effect Test
Verifit ® User's Guide Version 4.8 © November 2016 12 Occlusion Effect Test The occlusion effect refers to the unnatural sound of one’s own voice that results from occluding the external ear. It is the result of the high SPL produced at the back of the throat during a closed vowel utterance coupling to the closed ear canal via bone conduction.
Page 84: Sensory Loss Simulator
Verifit ® User's Guide Version 4.8 © November 2016 13 Sensory loss simulator This sensory loss simulator (SLS) is intended to allow normal-hearing listeners to hear sounds as if they had the elevated threshold and altered loudness perception caused by outer and inner hair cell damage. It is based on the cochlear hearing loss model described in Moore &...
Page 85 Verifit ® User's Guide Version 4.8 © November 2016 9. Click [Type of loss] to toggle between [Sensorineural] and [Conductive] hearing loss simulations. 10.Click to stop the demonstration and freeze the stimulus speech banana on the screen. 11.Click on to exit from the Sensory Loss Simulation screen.
Page 86: Insertion Gain
Verifit ® User's Guide Version 4.8 © November 2016 14 Insertion Gain Insertion gain is the difference between aided and unaided ear canal SPL (REIG = REAG - REUG). It inherently assumes a sound field audiogram. For non-linear hearing aids, REIG is stimulus-dependent and the dependency is specific to each hearing aid.
Page 87: Insertion Gain In Hl
Verifit ® User's Guide Version 4.8 © November 2016 1. Speech Intelligibility Index (SII), 2. SII for target, 3. Fitting method, 4. Target REIG, 5. REUR, 6. REAR 1, 7. REIG Insertion gain in HL Refer to On-Ear Measures - Setup and On-Ear Measures Screen Setup for terminology and information on preparing the system for use and for proper positioning of the client and the probe tube.e...
Page 88: Audiometric Data Entry
Verifit ® User's Guide Version 4.8 © November 2016 1. Speech Intelligibility Index (SII), 2. SII for target Aided Threshold, 3. Fitting method, 4. Speech Region (@70 dB SPL), 5. Target Aided Threshold, 6. Unaided Threshold, 7. Estimated Aided Threshold.
Page 89: Reur Measurement Procedure
Verifit ® User's Guide Version 4.8 © November 2016 2. Select [Transducer], then choose from the list. 3. Click [REUR] to toggle selection. Measured REUR should be used with a sound field threshold because individual REUR is part of the threshold.
Page 90: Rear Measurement Procedure
SII calculation in Insertion gain The Verifit calculates a Speech Intelligibility Index (SII) value for unaided speech at 70 dB SPL (REUR), the target REIG and for each aided test. The calculations use the 1/3 octave band method of ANSI S3.5 –1997 without the 160 Hz band and without masking effects with results expressed as a % by multiplying by 100.
Page 91: Cros Fitting Using Insertion Gain
Verifit ® User's Guide Version 4.8 © November 2016 the listener. There is considerable individual variability in relating the SII to speech recognition, especially amongst impaired listeners. The following shows expected nominal recognition scores vs SII for normals when using a variety of speech stimulus conditions. (Killion and Mueller, Hearing Journal, January, 2010 pp 10-15).
Page 93: Test Box Measures - Setup
Verifit ® User's Guide Version 4.8 © November 2016 15 Test Box Measures - Setup The appearance of test box screens may be changed in several ways. Most screens may be viewed as a single, full-screen or dual, side by side panels. Most screens may be formatted to show results in graphical or tabular format.
Page 95: Format
Verifit ® User's Guide Version 4.8 © November 2016 Format Except for Distortion, Input/Output and Manual control screens, you have the option of selecting either a graphic or tabular format. To change the data format, click [Graph] or [Table]. Scale On the Multicurve test screen, you have the option of displaying test results in SPL (dB) or gain (dB).
Page 96: Ansi Test Frequencies
Verifit ® User's Guide Version 4.8 © November 2016 Hiding a curve does not erase it. To erase curves click and select one of the Erase data options. To hide or show test curve(s) in all other applications: 1. Left-click [Hide/Show].
Page 97: Test Box Calibration Facts
Verifit ® User's Guide Version 4.8 © November 2016 Click on to save your selections. Test box calibration facts Test box microphone calibration establishes a correction curve for each uncalibrated test box reference microphone by comparison with the factory calibrated coupler microphone. It may be performed as often as desired but will be invalidated at 12 am the following day or at 12 am the following week, depending on the choice of Daily or Weekly calibration interval.
Page 98: Calibration Check For Coupler Microphone
Verifit ® User's Guide Version 4.8 © November 2016 [Date & Time]. It is recommended that you print a copy of the initial calibration curve and compare it with your daily or weekly curve. Any change in this curve indicates a drift in either the coupler or the reference microphone which needs further investigation.
Page 99: Coupling For Binaural/Wideband Tests
Verifit ® User's Guide Version 4.8 © November 2016 Coupling for binaural/wideband tests WARNING: To reduce the risk of contamination, hearing instruments should be clean before putty is applied and putty should be replaced frequently For non-ANSI test-box tests (e.g. Speechmap) the two 0.4 cc wideband couplers must be used. NOTE: under no circumstances are the blue 2cc couplers to be used in Speechmap.
Page 100: Coupling For Ansi/Iec Tests
The Verifit is supplied with two blue-colored, metal, 2cc couplers, a type HA-1 (ITE) and a type HA-2 (BTE) for ANSI test box tests, and two silver-colored 0.4 cc wide-band couplers for all other test-box tests. Note that an ANSI standard coupler for CICs does not exist;...
Page 101: Positioning Hi For Ansi/Iec Tests
Verifit ® User's Guide Version 4.8 © November 2016 or stretching which will cause feedback. Custom instruments are sealed to the HA-1 coupler with putty so that the end of the eartip is flush with the inside of the coupler opening. Putty should not extend into the coupler cavity or block the sound outlet of the instrument.
Page 102 Verifit ® User's Guide Version 4.8 © November 2016 Positioning an ITE instrument for ANSI tests Positioning a RIC instrument for ANSI tests...
Page 103: Ansi/Iec Hearing Aid Tests
Press to resume the test. During the ANSI S3.22-2003 test, the Verifit will pause to request that AGC controls or programmable parameters be set for maximum AGC effect. If the manufacturer does not provide settings to produce maximum AGC effect, use settings that result in the highest gain for soft sounds and the lowest gain for loud sounds.
Page 104: Ansi Test Results
Verifit ® User's Guide Version 4.8 © November 2016 ANSI test results Full-on average gain (1) is measured with a 50 dB input SPL, average gain at RTS (2) is always measured at 60 dB input SPL and the frequency response curve (3) is always run at 60 dB input SPL.
Page 105: Ansi Telecoil Terminology
Ensure that the test box is well sealed and ambient noise is low. ANSI telecoil terminology The Verifit 2 test chamber contains a telecoil test loop and the tele-test handset contains a telephone magnetic field simulator (TMFS), both of which meet the requirements of ANSI S3.22 and enable the measurement of coupler SPL produced by a hearing instrument with a telephone pickup coil.
Page 106: Ansi Test Loop Test
Verifit ® User's Guide Version 4.8 © November 2016 5. Position the aid on the 'T' on the tele-test handset. BTE aids should lie as flat as possible on the tele-test surface, while custom aids should be oriented with their faceplate parallel to the top surface (if possible) and touching it as shown.
Page 108: Other Test Box Measures
17 Other Test Box Measures In addition to the tests of ANSI S3.22, the Verifit also provides the following tests in the test box: Manual control: Coupler and test box reference mic. SPL and coupler mic. distortion at selected 1/12th octave frequencies and stimulus SPL of 0 and 40 –...
Page 109: Noise Reduction Stimuli
Once directional performance is observed the test may be terminated. Because the Verifit test chamber is small and anechoic only at higher frequencies, results are not expected to agree with data taken in large anechoic chambers. The directional test is provided as a functional test of directional performance, providing assurance that the directional microphone array has been correctly assembled and programmed and has not deteriorated due to element drift or clogged ports.
Page 110: Directional Ite Positioning
Verifit ® User's Guide Version 4.8 © November 2016 Directional ITE positioning Ensure that the left hearing instrument is tested on the left coupler and that the right hearing instrument is tested on the right coupler. Orient the instrument on the coupler the same as it would be worn on the client's head.
Page 111: Test Box Directional Procedure
Verifit ® User's Guide Version 4.8 © November 2016 Test box directional procedure To test directional function in the test chamber: 1. Mount the hearing aid to the 0.4cc wideband coupler (see Coupling the hearing instrument). 2. Position the hearing instrument in the test chamber as shown in Directional ITE positioning or Directional BTE positioning.
Page 112: Multicurve Procedure
40 – 90 dB SPL and 0 dB (off). Multicurve allows the use of the 2cc HA-1 coupler or the 0.4cc Audioscan Wideband Coupler (AWC). The HA-1 coupler is not useful at high frequencies because of resonances and low signal levels. The use of the AWC is desirable because it raises the high frequency SPL of the hearing aid by more than 20 dB, making the rising noise floor of the coupler microphone less significant.
Page 113: Spectral Analysis In Multicurve
Verifit ® User's Guide Version 4.8 © November 2016 Spectral analysis in Multicurve Selecting a stimulus level of 0 dB (off) in [Multicurve] presents a spectral analysis of the coupler microphone signal (Scale = dB SPL) or the difference between the coupler and reference microphone spectra (Scale = dB Gain).
Page 114: Manual Control Procedure
40 to 90 dB (in 5 dB steps) and at 0 dB (off). Manual control allows the use of the 2cc HA-1 coupler or the 0.4cc Audioscan Wideband Coupler (AWC). The HA-1 coupler is not useful at high frequencies because of resonances and low signal levels. The use of the AWC is desirable because it raises the high frequency SPL of the hearing aid by more than 20 dB, making the rising noise floor of the coupler microphone less significant.
Page 115: Sound Level Meter Using Manual Control
Sound level meter using manual control When set for a stimulus level of 0 dB (off), the Manual control mode allows the Verifit to be used as a sound level meter. Sound at the test box reference microphone and the coupler microphone may be analyzed by 1/12th octave, A-weighted or C-weighted filters.
Page 116 Verifit ® User's Guide Version 4.8 © November 2016 extension cables should not be used. They will substantially increase noise levels.
Page 117: Networking
Audioscan NOAH module. If you have a wired network, see the General Operation section for instructions about how to connect the Verifit through a wired connection. If you have a wireless network, you can use the Verifit's built-in wireless feature. In either case, the following section describes how to set up the network connection in software, before transferring data, printing results, or using the Remote Operation software.
Page 118 (a) Select [Change] to set [Network] to the Wireless option. (b) Click [Scan]. (c) The Wireless Network poster will be presented and the Verifit will automatically scan for available wireless networks. Note: non-broadcast SSIDs are not supported and wifi networks containing {}[]"'|\ will not be displayed in the pull-down menu.
Page 119: Remote Operation
(d) Click to apply your changes. Remote Operation Once your Verifit is connected to a network, you can control it from any Windows PC using the Audioscan Remote application, available at no cost from software update download page at www.audioscan.com. Remote...
Page 120: Changing The Remote Operation Settings
Audioscan Remote application to run properly. TeleAudiology Once your Verifit is connected to a network, you can control it from any Windows PC using the Audioscan TeleAudiology application. The TeleAudiology application has been specifically designed use in a teleaudiology environment and optimized for long distance communications.
Page 121: Noah Service Port
TCP port, which is 8080 by default. Some Windows anti-virus software packages and some network firewalls prevent access to specific ports, including 8080. Using the NOAH module in the presence of such security settings may require changing the NOAH service port on both the Verifit, and in the Audioscan NOAH Module.
Page 122: Testing The Noah Service Port
The Verifit provides the NOAH service using the HTTP protocol to transmit XML-formatted data. Communication between the Windows PC and the Verifit can be tested using an ordinary web browser. 1. On the Windows PC, enter the Verifit network address and port number into a web browser following this example: http://172.30.1.86:8080/noah...
Page 124: Single Computer Connection
Most office computers today are already connected to a network, through either a wired or wireless (wifi) interface. In these cases, the Verifit must be added to the same network as the computer. (See Networking for details.) In cases where no network exists, the Verifit can be networked directly to a single computer. There are two methods, depending on the network hardware available.
Page 125 255.255.255.0 in the Subnet mask box. 6. On the Verifit, un-check Auto on the Setup network screen and click the Change button. Then set the network addresses as shown below by clicking on the down arrow buttons and selecting from the drop-down lists.
Page 126: Printing And Storing Results
20 Printing and Storing Results The Verifit can print results for future reference, as well as store results in computer files for future use. Using a web browser, you can capture the Verifit's screen image for printing or saving on any computer. The Verifit can also store audiometric data and test results in the optional Audioscan NOAH Module.
Page 127: Printer Connection
When using the Printer output option, you must also select the printer Connection and Type. If the printer connects directly to your Verifit through a standard USB cable, select USB. If the printer is accessible on a local area network (LAN), then select either Windows Share or Network.
Page 128: Printer Types
HP printer to start printing the test page. Otherwise, check your settings and try again. Alternatively, you may prefer to use a web browser to capture the Verifit screen image, and to print from the browser using the computer's printer. See Web browser screen capture, for details.
Page 129: File Output
Custom HP printer File output The Verifit can print results in a file for future printing and viewing. You can also include these printed files in documents or display them in presentations. In Printing Setup, select the File output option. To save the output on a USB drive, select USB. To save the file in a shared folder on a Windows computer, select Windows Share.
Page 130 Appendix 1: Manufacturer Disclosure Statement for Medical Device Security. Ask option To have the Verifit stop and present the page setup options every time you print, enable the Ask checkbox. Enabling Ask allows you to change the page setup options with each printout, for example, to include Header text that identifies the patient, or to include Description notes that elaborate on the test results.
Page 131: Windows-Shared Printers And Folders
In Printing Setup and Session Setup, click on [Details]. The Verifit will briefly confirm the network connection. If the network connection fails, the will Verifit present the Network setup details, where you can correct any setup problems before trying again. See the section, Network Setup for details.
Page 132 ® User's Guide Version 4.8 © November 2016 The Verifit automatically scans for the available domains, computers and shares. To enter the share name directly, disable the checkbox, then type the printer or folder share name into the text field.
Page 133: Network Printer
Network printer details – Printer test passed Web browser screen capture Verifit screen image at any time using a web browser. Through the browser, you can print You can capture the or save the image using the computer's printer or file storage.
Page 134: Session Setup
The Verifit itself does not store data. All entered and measured data are lost when you turn the Verifit off. Also, each time you change clients you need to erase the Verifit's session data, so that the data and test results do not become mixed or confused among different clients or hearing instruments.
Page 135: Storing And Restoring Session Files
Client ID window. To add a session for an existing Client ID: 1. Select the client in the list using the mouse or a connected keyboard. The Verifit will highlight the closest match as you type.
Page 136 Excel. To view a session file Excel, right click on the file and select Open With. Choose a browser program or Microsoft Excel. When prompted for a style sheet, select the audioscan.xsl from the same folder, which the Verifit saves alongside any session data files.
Page 137: Troubleshooting
This section covers common problems encountered when using the Verifit. If you require further assistance, note your model and serial number (located on rear of display unit) and contact your local distributor, or Audioscan at 519-268-3313 800-265-2093 (USA only), 519-268-3256 (fax) or service@audioscan.com PLEASE DO NOT SHIP YOUR UNIT BACK TO THE FACTORY.
Page 138: Inconsistent Levels In Speech Stimulus
• Computers, fans and air conditioners may be the source of the vibration. Try turning off suspected sources to identify the cause. Relocate the source or the Verifit test chamber or mount the test chamber on a foam pad. Test box curves inconsistent The test box curves keep changing from test to test.
Page 139: Test Box Speaker Overdriven
No (right or left) test box reference mic. detected! This message may be displayed when starting a hearing instrument test. It indicates that the Verifit is not measuring any sound at the (right or left) test box reference microphone. The test box reference microphones are the two black microphones located in the test chamber.
Page 140: No On-Ear Ref. Mic. Detected
No on-ear ref. mic. detected No (right or left) on-ear reference mic. detected. This message may be displayed when starting an On-ear test. It indicates that the Verifit is not measuring any sound at the on-ear probe reference microphone. Check that a probe microphone assembly is securely plugged into the PROBE connector on the lower side •...
Page 141: Binaural Tests Run Twice
Verifit will perform the measurement twice to obtain an accurate result for both ears. For best success using Verifit binaural mode on ear Ensure the patient and the Verifit real-ear speaker are directly facing each other and less than 60 cm (24 •...
Page 142: Headphone High Distortion Or Noise
Verifit ® User's Guide Version 4.8 © November 2016 blocked. Check that the probe dock is connected to the rear unit. • Check that the WRECD transducer is inserted into the ear that is currently under test. • Headphone high distortion or noise Headphone output contains uncomfortable distortions or noise Headphone output may be clipping when using a high powered hearing instrument.
Page 143: Technical Specifications
Verifit ® User's Guide Version 4.8 © November 2016 22 Technical Specifications Specifications subject to change without notice Environmental conditions STORAGE & TRANSPORTATION Temperature........- 20°C to +60°C Relative humidity (non-condensing)...5% to 95% OPERATING Temperature........+15°C to +30°C Relative humidity (non-condensing)..20% to 50% Atmospheric Pressure......800–1060 hPA...
Page 144 Verifit ® User's Guide Version 4.8 © November 2016 Test Box Working Space WxHxD....28.0x7.5x12.3 cm ............11.0x3.0x4.8 in. Speakers..............3 ..............@ 30 mm ..............@ 1.25 in. Isolation @1 kHz..........>25 dB Induction coil..........ANSI S3.22 ............@ 23.5x16.9 cm ..............@ 9.2x6,7 in. Battery simulator........ANSI S3.22 Frequency range........200–12500 Hz...
Page 145 Verifit ® User's Guide Version 4.8 © November 2016 Reference Test Gain Frequency Response Frequency Range Maximum OSPL90 Harmonic Distortion Attack & Release time Equivalent Input Noise Input/Output Curves Coupler SPL - Telephone Simulator Simulated Telecoil Sensitivity Battery Drain OTHER TESTS AVAILABLE Speechmap®...
Page 146 Verifit ® User's Guide Version 4.8 © November 2016 On-Ear Speakers (ducted port)..........2 ..............@5x9 cm ..............@2x3.5 in. Probe microphone tube........Silicone ........1 mm diameter x 75 mm long Probe modules............2 ....Each with probe and reference microphones Probe microphone noise floor................200–12500 Hz < 45 dB SPL Frequency Range.........200–12500 Hz...
Page 147 Verifit ® User's Guide Version 4.8 © November 2016 Manual measurement of output, gain and distortion FITTING METHODS AVAILABLE Speechmap with..........DSL5.2 ...............NAL-NL1 ...............NAL-NL2 ................CAMFIT Insertion gain with...........NAL-RP ...............NAL-NL1 ................Fig6 ................Pogo II ................Berger ................Libby Sensory Loss Simulator Simulation types........Sensorineural ............Linear conductive ......Non-linear outer hair cell cochlear loss...
Page 150: Glossary
Verifit ® User's Guide Version 4.8 © November 2016 23 Glossary ABR, Auditory Brainstem Response, The auditory brainstem response (ABR) test gives information about the inner ear(cochlea) and brain pathways for hearing. This test is also sometimes referred to as auditory evoked potential (AEP).
Page 151 Verifit ® User's Guide Version 4.8 © November 2016 FM System, an assistive listening device consisting of a microphone, an fm radio transmitter and an fm receiver. The microphone and transmitter are worn by the speaker and the receiver is worn by the listener.
Page 152 Verifit ® User's Guide Version 4.8 © November 2016 OSPL90 (output SPL for 90-dB input SPL), The SPL developed in a 2cc coupler when the input SPL is 90 dB, with the gain control of the hearing aid full-on (ANSI S3.22).
Page 153 Originally speech was simulated using amplitude-modulated tonal signals. The Verifit replaces these simulated speech signals with real speech, both recorded and live. For details of the test signals and analysis methods, see Speechmap Technical Details.
Page 154 Verifit ® User's Guide Version 4.8 © November 2016 TRIC: Thin-tube Receiver In-the-Canal style of hearing instrument UCL, Uncomfortable Listening Level, the level for a specified stimulus that is judged to be definitely uncomfortable. Volume Control, a user-operated gain control.
Page 155: References
Byrne, D. (1977). The speech spectrum - Some aspects of its significance for hearing aid selection and evaluation. British Journal of Audiology, 11,40-46. Cole, W.A. & Sinclair, S.T. (1998). The Audioscan RM500 Speechmap/DSL fitting system. Trends in Amplification, 3(4):125-139. Corliss, E. L. R. (1990) The ear as a mechanism of communication. Journal of Audio Engineering Society, 38(9):640-652.
Page 156 McInerney, C., Tang J., Zelmer, D., & Scollie, S. (2016). Development of a Cantonese Speech Passage for Hearing Aid Evaluation: Comparison to the International Speech Test Signal. Technical report developed for: Audioscan. The University of Western Ontario, London, ON. Moodie, K.S. (1996). A practical approach to hearing aid selection. BSA News 18:6-8.
Page 157 Verifit ® User's Guide Version 4.8 © November 2016 hearing aids: Comparison to prescriptive targets. JAAA 11:230-238. Scollie, S., Seewald, R., Cornelisse. L., Moodie, S. T., Bagatto, M., Laurnagaray, D., Beaulac, S. & Pumford, J. (2005). The Desired Sensation Level Multistage Input/Output Algorithm. Trends in Amplification, 9-4, 159-197.
Page 158: Manufacturer Disclosure Statement For Medical Device Security
Verifit ® User's Guide Version 4.8 © November 2016 25 Appendix 1 Manufacturer Disclosure Statement for Medical Device Security...

audioscan verifit User Manual

1 About Verifit

2 Getting Started

3 General Operation

4 General Setup

5 On-Ear Measures - Setup

6 On-Ear Measures Screen Setup

7 Speechmap

8 Speechmap Fitting Procedures

9 Speechmap Technical Details

10 On-Ear Instrument Measures

11 WRECD Measurement

12 Occlusion Effect Test

13 Sensory Loss Simulator

14 Insertion Gain

15 Test Box Measures - Setup

16 ANSI/IEC Hearing Aid Tests

17 Other Test Box Measures

18 Networking

19 Single Computer Connection

20 Printing and Storing Results

21 Troubleshooting

22 Technical Specifications

23 Glossary

24 References

25 Appendix 1

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