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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

The following components are shipped with the test box

Component

Description

Test box cable

to connect the test box to the display unit

Binaural coupler microphone

for the purpose of

measuring the sound level produced in the standard coupler
by a hearing instrument

Testbox reference microphones

for controlling the signal

from the loudspeakers (2)

Содержание verifit

Страница 1: ...Audioscan Verifit User s Guide 4 8 November 2016...

Страница 2: ...nnection 30 Printer connection 31 Menus lists and buttons 32 Screen messages and Help 32 Software updating 32 4 General Setup 34 Date and time setup 34 Display settings 34 Saving test setup 34 5 On Ea...

Страница 3: ...ails 69 Wideband measurements in Speechmap 69 Speechmap stimuli 69 Stimulus spectra 70 Microphone location effects 72 Deep insertion compensation 72 Speech signal analysis 73 10 On Ear Instrument Meas...

Страница 4: ...est 106 Telecoil test results 107 17 Other Test Box Measures 108 Harmonic distortion 108 Noise reduction 108 Noise reduction stimuli 109 Directional function test 109 Directional ITE positioning 110 D...

Страница 5: ...x curves inconsistent 138 Test box curves differ from specifications 138 Test box speaker overdriven 139 No test box reference mic detected 139 Invalid test box calibration 139 Unable to calibrate tes...

Страница 6: ...ystem PEMS The system consists of a real ear measurement REM display unit a hearing instrument test HIT acoustically treated binaural test box and numerous attachable components and accessories Displa...

Страница 7: ...th 2 probe microphones which nest into and are connected to the probe dock This is the configuration of these components when they are shipped to you The probe dock has connections for the 2 probe mic...

Страница 8: ...coupler Foam eartips for measuring WRECD The package contains Qty 5 ER3 14A adult foam eartips Qty 5 ER3 14B pediatric foam eartips Wireless mouse Monitor headphones provided with 2 detachable detacha...

Страница 9: ...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 US...

Страница 10: ...ophones binaural coupler microphone battery pill substitutes The following components are shipped with the test box Component Description Test box cable to connect the test box to the display unit Bin...

Страница 11: ...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 Not to be used for Speechmap Hearing instrument stabilizers attached to the...

Страница 12: ...bstitutes kit consisting of 1 E352 Battery Size 10A 1 E353 Battery Size 13A 1 E354 Battery Size 312 1 E355 Battery Size 675 Accessories RE367 36 probe tubes for single patient use 36 per bag ER3 14A a...

Страница 13: ...is not suitable for use in an oxygen rich environment or in the presence of flammable anesthetic mixtures with air or with oxygen or nitrous oxide WARNING To ensure proper operation of this product no...

Страница 14: ...h could endanger the environment and human health This product and its associated items must be disposed of in accordance with local disposal regulations for electrical and electronic waste Consult yo...

Страница 15: ...ty Service GmbH Schiffgraben 41 30175 Hannover Germany Warranty The Verifit is warranted against defects for two years from date of purchase Within this period it will be repaired without charge for p...

Страница 16: ...alia 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 sof...

Страница 17: ...Verifit User s Guide Version 4 8 November 2016 EC Declaration of Conformity 17...

Страница 18: ...DIOSCAN UPDATE STICK IN A SAFE PLACE YOU WILL REQUIRE IT TO INSTALL FUTURE SOFTWARE UPDATES How to Avoid Undesirable Side Effects During the development of the hearing instrument analyzer Audioscan pe...

Страница 19: ...are made of soft flexible material specially designed for this application it is possible to scrape the ear canal or touch the eardrum causing brief discomfort You should carefully follow the instruc...

Страница 20: ...o a depth greater than 16mm 5 8 3 Remote operation As the Verifit can be run from your PC desktop in On top mode more unconventional office setups are possible as the display unit does not necessarily...

Страница 21: ...e test chamber if the test chamber will be used in front to the display unit Note all on ear functions will operate without the test box connected to the display unit Text box cable provided uses HDMI...

Страница 22: ...r 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 Grad...

Страница 23: ...dules should be kept in the probe dock when not in use positioned with the reference microphone ports facing outward 3 Link the probe microphone cables with the probe cables adjust clip as shown above...

Страница 24: ...ld be cleaned prior to introduction to the test chamber due to the difficulty of sanitizing the acoustic foam Custom hearing instruments must be cleaned with disinfectant towlettes i e audiowipes prio...

Страница 25: ...t in use or when transporting the Verifit 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 co...

Страница 26: ...ention by selecting only the left or right microphone signals By repeatedly clicking the mouse wheel you rotate your selection among the binaural left only right only and muted headphone presentation...

Страница 27: ...d external monitor will operate simultaneously The external monitor must be capable of displaying 1024 x 768 at a refresh rate of 60Hz Ensure that the external display is powered up and set to the cor...

Страница 28: ...the power supply module indicates that it is receiving electrical power from the outlet Input device operation The Verifit is operated with a USB mouse included or a keyboard not included to select i...

Страница 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 29...

Страница 30: ...s allow the use of a virtual keyboard for entering via mouse only Widgets with this button allow a virtual keyboard to be used Press to show virtual keyboard Not available Press to remove the virtual...

Страница 31: ...gh 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 un...

Страница 32: ...d item in a drop down option list Screen messages and Help The Title bar top line of the display screen informs you of the selected Test e g Speechmap The Message bar bottom line of the display screen...

Страница 33: ...ke 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 7 Click on Transfer soft...

Страница 34: ...blanks the screen to prolong display life click the Screen saver window 3 Select the desired screen saver timing from the drop down list 4 In this screen you can also select the Mouse pointer speed b...

Страница 35: ...li 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 To set current test levels stimuli and as...

Страница 36: ...ne attachment to the AWC which accepts the nozzle of a thin tube or RIC type hearing aid It will also accept the nozzle of the RECD transducer an ER 3A insert earphone and 13 standard earmold tubing W...

Страница 37: ...ld be repeated if a probe module is replaced or if a probe tube with different dimensions is installed Switching left and right probe modules after calibration will result in the wrong calibration cur...

Страница 38: ...ser 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 shifte...

Страница 39: ...cked against a high quality sound level meter 1 Right click to raise the home menu and click Manual control under On ear 2 Click Level then select 70 from the drop down list 3 Click Frequency then sel...

Страница 40: ...lus peak to peak equivalent SPL pe SPL at ABR threshold relative to the average stimulus pe SPL at ABR threshold of a normal hearing jury OR b stimulus SPL at ABR threshold relative to the average sti...

Страница 41: ...e for adult females approximately 30 mm from end of probe tube for adult males and approximately 20 25 mm from end of probe tube for children These positions may be modified based on the otoscopic exa...

Страница 42: ...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 mark...

Страница 43: ...Insertion gain left click Format then select Graph Table or 2cc targets from the drop down list In 2cc targets format reserve gain and fitting formula may be changed Choose and change reserve gain or...

Страница 44: ...w test curve s in all other applications 1 Left click Hide Show 2 Click on the desired test result to toggle between the Hide or Show options The curves will toggle on or off when selected 3 Click wit...

Страница 45: ...ting DSL 5 in Speechmap Copyright DSL 2004 Version 5 0 The Desired Sensation Level DSL method is a systematic eardrum sound pressure level SPLogram approach to hearing instrument fitting that seeks to...

Страница 46: ...nsertion Gain targets are not provided 2 There is no provision to select Insert earphones earmold as the audiometric transducer since this invalidates the audiometer calibration and correction for thi...

Страница 47: ...an accurate SII calculation When using live speech a pause button captures short term speech features See SII calculation in Speechmap and Speechmap Technical Details Before starting please see On Ea...

Страница 48: ...imulus click the box beside the stimulus you want to add to the list A check mark will be placed next to the selected stimulus 2 To remove a checked stimulus from the list click the box beside the sti...

Страница 49: ...aided 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 reg...

Страница 50: ...4cc coupler are converted to estimated ear canal levels using the RECD or WRECD values age appropriate average entered or measured See Speechmap screen choices In addition the stimulus delivered to t...

Страница 51: ...I 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...

Страница 52: ...Choose your custom stimulus After a short delay your stimulus will begin playing 9 Use your new stimulus with all the features of Speechmap Example of two custom files click wav and 1khztone wav in t...

Страница 53: ...audio editing software Leveling Options By default Speechmap will automatically level the WAV file so that the SPL matches the level selected for the test The automatic leveling of the WAV file can b...

Страница 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 54...

Страница 55: ...ar or Test box Graph or Table Dual view or Single view L or R or L R Audiometry BTE HA 4 BTE mold ITE ITC CIC CIC shallow RITE Body Open CROS or FM and Loss simulator Clicking on Audiometry will cause...

Страница 56: ...c coupling The WRECD is used to convert 0 4cc coupler SPL measured in the test box to estimated ear canal SPL The WRECD is used to convert entered HL data thresholds and UCL s to ear canal SPL when In...

Страница 57: ...quency and level and the ENTER key on the numeric keypad enters or deletes a point The keyboard s numeric keypad can also be used to type in data Switch sides by moving mouse cursor over to other side...

Страница 58: ...ap screen choices for setup and audiometric data entry See Using Speechmap 1 Follow the instructions in Speechmap screen choices to enter audiometric data and select the fitting rule 2 Click in the 2...

Страница 59: ...clicking beside the Unaided Audibar Adjusting the Maximum Output Level See Speechmap screen choices for setup and audiometric data entry See Using Speechmap Follow the instructions in Speechmap scree...

Страница 60: ...There are no special real ear SPL targets for open fittings it doesn t matter how the sound reaches the TM the perception is the same However the sound that escapes from a vent or open fitting may be...

Страница 61: ...map from either the On ear or Test box columns 2 Program the hearing instrument so that the frequency lowering feature is inactive 3 Access Test 1 2 3 or 4 by clicking on the appropriate to start that...

Страница 62: ...a test The output from both hearing instruments will be display simultaneously 4 Once the test is started click the Stimulus list button to select the stimulus type Click the Level list button and sel...

Страница 63: ...ears and turn them ON 2 Position the speaker at 45 degrees to the good ear and set Instrument to BTE 3 Click in test 1 area to start test and record a response using Pink noise at Soft 55 It should be...

Страница 64: ...ent to T Telecoil input 2 Click in any of the test areas to start test and select one of the calibrated speech stimuli 3 Change the level to T Loop 65 This will result in a T Loop signal equivalent to...

Страница 65: ...Effects The tele test handset can be used in both Test box and On ear Speechmap modes For tests in the test box the lid must remain open while the handset is positioned near the hearing instrument out...

Страница 66: ...ng 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 7 Click to measure and store the long...

Страница 67: ...mitter unmuted repeat step 2 Note that the hearing aid is outside the test box during this test Quiet please The results should be within 2 dB of the results from step 3 If not change FM settings and...

Страница 68: ...elow 3 Enable a frequency lowering signal processor Start with the default frequency lowering setting The S will loop so you can keep it playing continuously while you fine tune the frequency lowering...

Страница 69: ...International Speech Test Signal ISTS and the single talker International Collegium of Rehabilitative Audiology ICRA distorted speech signal Two speech passages have been filtered to provide the same...

Страница 70: ...filtering For fitting FM systems the stimuli may be modified to represent the level 84 dB SPL and spectrum at a chest microphone location and the level 93 dB SPL and spectrum at a boom microphone loca...

Страница 71: ...0 1 0 0 0 1 2 5 0 1 6 0 0 2 0 0 0 2 5 0 0 3 1 5 0 4 0 0 0 5 0 0 0 6 3 0 0 8 0 0 0 1 0 0 0 0 1 2 5 0 0 1 6 0 0 0 Fre q u e n cy H z 1 3 o ct a v e b a n d SP L fo r sp e e ch a t 7 0 d B SP L fro m B y...

Страница 72: ...3 9 11 9 27 7 10000 40 4 28 0 34 1 31 4 52 2 7 1 2 3 10 7 26 5 12500 38 2 22 6 31 3 29 9 52 2 10 6 3 1 9 7 25 5 Overall 65 65 65 65 65 75 75 84 93 The above values may differ slightly from previous s...

Страница 73: ...trum 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 sample...

Страница 74: ...ing aids Once directional performance is observed the test may be terminated Because this measurement is carried out in a real room results are not expected to agree with data taken in large anechoic...

Страница 75: ...to advance the probe tube further into the ear canal A lubricant applied in the vicinity of the probe tube will ease insertion and prevent slit leaks 2 Set the instrument as it will be used with feedb...

Страница 76: ...n example of the noise created by a household air conditioner Vacuum is a sample of noise from th operation of a vacuum cleaner on a carpeted floor Multi talker Babble is the combination of ten differ...

Страница 77: ...s 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 ms 1 Refer to On Ear Measures Set...

Страница 78: ...tion of the Audioscan RECD transducer in this coupler is required at a minimum of weekly 1 Connect the WRECD transducer to the WRECD jack on the Probe Dock Prepare the system for test box tests See Mi...

Страница 79: ...o to 15 3 Calibration of WRECD transducer If a valid transducer calibration exists select Measure real ear 4 Couple a standard insert earphone foam eartip to the nozzle of the WRECD transducer If usin...

Страница 80: ...essed WRECD from the main menu you may click the Age box to change the age for this reference curve WRECD results The WRECD measurement screen shows the response of the WRECD transducer in the 0 4cc c...

Страница 81: ...the measurement in the test box Measured WRECD is appropriate for coupler simulation and error is minimized Alternate method 1 RECD On ear measurement Audioscan WRECD transducer client s personal earm...

Страница 82: ...differs for the ear canal and 2cc coupler measurements further 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 r...

Страница 83: ...aints This occlusion effect measurement is useful in quantifying the extent to which venting or deep insertion is addressing the underlying cause of the complaint Occlusion effect measurement 1 Refer...

Страница 84: ...ll damage Any loss greater than this is considered inner hair cell loss This SLS does not simulate broadening of the auditory filters or other distortions that may accompany cochlear hearing loss To p...

Страница 85: ...9 Click Type of loss to toggle between Sensorineural and Conductive hearing loss simulations 10 Click or to stop the demonstration and freeze the stimulus speech banana on the screen 11 Click on to e...

Страница 86: ...ts Speechmap is recommended for fitting all linear and non linear hearing instruments Refer to On Ear Measures Setup and On Ear Measures Screen Setup for terminology and information on preparing the s...

Страница 87: ...k the right mouse button and then select Insertion gain 2 Click Instrument to chose from BTE ITE ITC CIC CROS Body This changes the CORFIG used for 2cc targets 3 Click the fitting method button to cho...

Страница 88: ...ion 70 dB SPL 5 Target Aided Threshold 6 Unaided Threshold 7 Estimated Aided Threshold Audiometric data entry Threshold data and parameters may be entered by manually using a mouse or the numeric keyp...

Страница 89: ...verage See Audiometric data entry 1 Click the right mouse button and then select Insertion gain 2 Referring to On Ear Measures Setup and On Ear Measures Screen Setup prepare the system position the pa...

Страница 90: ...nt If no level is shown use the lowest level required to overcome background noise 8 Adjust the hearing instrument so that the REIG curve SPL scale or Aided threshold curve HL scale approximates the d...

Страница 91: ...on in the ears and turn them ON 2 Position the speaker at 45 degrees to the good ear and set Instrument to BTE 3 Select REAR 1 and record a response using Pink noise at 55 It should be like a normal...

Страница 92: ...Verifit User s Guide Version 4 8 November 2016 92...

Страница 93: ...may be hidden but not erased Test box screen Except for Input Output Battery drain and Manual control screens you have the option of selecting either a single full screen view or a dual side by side...

Страница 94: ...Verifit User s Guide Version 4 8 November 2016 94...

Страница 95: ...e test screen you have the option of displaying test results in SPL dB or gain dB To change the scale click dB SPL or dB Gain Hide or Show test box curves To hide or show unaided and aided curves on t...

Страница 96: ...I S3 22 2003 and ANSI S3 22 2009 facts The Frequencies feature allows hearing instruments to be evaluated at the Special Purpose Average SPA frequencies defined by ANSI S3 22 rather than the default H...

Страница 97: ...ion curve should be similar to the one shown but may be at a different level It should remain stable over time Irregularities in the calibration curve may be the result of not properly aligning the mi...

Страница 98: ...microphone See Calibrating test box reference microphone 2 Screw the appropriate calibrator ring onto the coupler microphone 3 Insert the coupler microphone with the attached calibrator ring into the...

Страница 99: ...or block the sound outlet of the mold Vents should be sealed at the lateral end It is very important that the instrument be well sealed to the coupler Use the hearing instrument stabilizers to prop th...

Страница 100: ...amination hearing instruments should be clean before putty is applied and putty should be replaced frequently The Verifit is supplied with two blue colored metal 2cc couplers a type HA 1 ITE and a typ...

Страница 101: ...sing the TRIC adapter except where otherwise required by the hearing instrument manufacturer Excess low frequency output is usually due to open vents or a poor seal to the coupler For health reasons h...

Страница 102: ...Verifit User s Guide Version 4 8 November 2016 Positioning an ITE instrument for ANSI tests Positioning a RIC instrument for ANSI tests 102...

Страница 103: ...ht mouse button to raise the home menu then select ANSI for ANSI 2003 or ANSI IEC for ANSI 2009 depending on what has been selected in Setup 2 Click Start test and follow the test setup instructions w...

Страница 104: ...any setting of the instrument controls but ANSI S3 22 requires that certain settings be used See ANSI S3 22 2003 and ANSI S3 22 2009 facts The Input Output test allows you to generate up to 4 separat...

Страница 105: ...ies RSETS relative simulated equivalent telephone sensitivity is calculated as HFA SPLITS minus RTG 60 A positive RSETS indicates greater output when using the telephone than when using the microphone...

Страница 106: ...l be shown ANSI test loop test ANSI S3 22 requires that the gain control be set to RTS before running this test The reference test gain RTG is required in order to calculate the RTLS The easiest way t...

Страница 107: ...Verifit User s Guide Version 4 8 November 2016 Telecoil test results 107...

Страница 108: ...aise home menu and select Distortion under Test box 2 Refer to Coupling the hearing instrument Positioning the hearing instrument and Battery pill use and care to prepare the instrument 3 Turn the hea...

Страница 109: ...edback compensation and other non linear algorithms Speech is added as a conditioning signal to ensure automatic speech activated directional programs become active Test levels are selectable in 5 dB...

Страница 110: ...t the front microphone opening on the faceplate and seal any vent at the faceplate Other positions may be preferable for some instruments Directional BTE positioning Ensure that the left hearing instr...

Страница 111: ...n curve the response to the back speaker s signal For a non directional instrument the two curves will be nearly identical Setting the instrument for directional operation should produce a separation...

Страница 112: ...Setup for connecting the hearing instrument to the coupelr microphone 3 Ensure the hearing instrument is powered and turned on 4 Select test 1 2 3 or 4 by pressing the respective button 5 Select Stimu...

Страница 113: ...octave frequencies Pressing Continue causes the swept filter analysis to be performed in 1 12th octave bands and displayed at 1 12th octave frequencies Battery drain test The battery drain test automa...

Страница 114: ...upler 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 makin...

Страница 115: ...the home menu using the right mouse button Select Manual control from the Test box list 2 Click on the Level button and select 0 dB stimulus level from the drop down list 3 Click on the Filter button...

Страница 116: ...Verifit User s Guide Version 4 8 November 2016 extension cables should not be used They will substantially increase noise levels 116...

Страница 117: ...ts wireless or wired interface The Verifit supports the 802 11 b g or n wireless network standards and speeds as well as the following wifi security standards 2 WPA WPA2 Passphrase Most common 3 WEP 1...

Страница 118: ...k WLAN 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 n...

Страница 119: ...imes use static address assignment Ask your network administrator for help in performing the following steps 7 To assign a static network address a Disable Auto DHCP b Click the Change button c Enter...

Страница 120: ...s including 5900 The presence of such security measures may require changing the rule within the anti virus package to allow the Audioscan Remote application to run properly TeleAudiology Once your Ve...

Страница 121: ...he Audioscan TeleAudiology application NOAH Service Port Consult your Network Administrator before changing the NOAH service port Changing the port successfully requires understanding the security pol...

Страница 122: ...1 86 8080 noah 2 If the communication is successful the web browser will display NOAH data formatted in XML noah Example XML noah Web Service Port The Verifit provides a simple web server for retriev...

Страница 123: ...Verifit User s Guide Version 4 8 November 2016 123...

Страница 124: ...rk connector on the PC 3 On the Verifit right click select and then click Network 4 Select Change to set Network to the Wired option Ensure Auto use DHCP is checked and click Test connection A network...

Страница 125: ...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 selec...

Страница 126: ...n the HIMSA NOAH public data format then they can also be obtained from or exchanged with other NOAH modules that comply with the public standard For example the Verifit can restore audiograms from an...

Страница 127: ...oose Windows Share if the printer connects through a Windows laptop PC or server computer Windows shared printers are common in both small and large offices See the section below Windows shared printe...

Страница 128: ...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...

Страница 129: ...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 out...

Страница 130: ...he page setup Header and Date To include custom text in the header enable the Header checkbox and enter the text in the field below it To include the date and time of printing in the header enable the...

Страница 131: ...ion 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 With a suc...

Страница 132: ...wing table indicates the possible causes of each failure and the corrective steps Failure Cause Correction Server The server cannot be found in the specified domain Change the server Change the domain...

Страница 133: ...marked with a green check and the printer will print the setup details on a sheet of paper Network printer details Printer test passed Web browser screen capture You can capture the Verifit screen im...

Страница 134: ...s on a USB drive or on a Windows shared folder You can later restore the session files to the same Verifit or to other Audioscan equipment Since the files use an XML data format you can also view sess...

Страница 135: ...urity Rule To store a session file 1 Click Session 2 Select Store session to file 3 Click the Client ID list button This will display a list of Client IDs with the first entry highlighted To add a new...

Страница 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 folde...

Страница 137: ...hen click on Self test 2 If you received a Max out in or a Routing failure remove any hearing aids from the test chamber and rerun self test 3 Unplug probe dock from display unit and unplug both the t...

Страница 138: ...equipment on the same table or wooden floor 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 V...

Страница 139: ...box reference microphone Plug the microphone back in again ensuring that it clicks into place Try the calibration procedure again Try switching the right and left test box reference microphones Invali...

Страница 140: ...faulty microphone Ensure not to attempt to use cleaned or sterilized probe tubes as this causes the probe mic inlet tube to become clogged with cerumen requiring microphone replacement and voiding mi...

Страница 141: ...ap when running in L R mode in the testbox It indicates that there was a significant difference between the left and right reference microphones Check that both reference microphones are securely plug...

Страница 142: ...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 Re...

Страница 143: ...isplay unit 3 0 kg 6 6 lb Test box 4 0 kg 8 8 lb Shipping 14 9 kg 32 8lb Display type LED backlit active color Display size 12 1 diagonal Resolution 1024x768 XGA Stereo headphone monitor amplifier 250...

Страница 144: ...dB SPL 8000 12500 Hz 4 dB SPL Equalization method Real time modified pressure method Stored for open fittings Analysis Frequencies per octave 12 Filter bandwidth 1 12th octave Measurement accuracy for...

Страница 145: ...oupler SPL Telephone Simulator Simulated Telecoil Sensitivity Battery Drain OTHER TESTS AVAILABLE Speechmap Speechmap for fitting telecoils Real time adaptive directional verification Frequency loweri...

Страница 146: ...s Swept tone frequencies per octave 12 Burst tone frequencies per octave 3 Speech Noise filter 1 3 octave Measurement accuracy for tones 1kHz 1 dB re 1 kHz 200 5000 Hz 1 dB re 1 kHz 5000 8000 Hz 2 5 d...

Страница 147: ...nd 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...

Страница 148: ...Verifit User s Guide Version 4 8 November 2016 148...

Страница 149: ...Verifit User s Guide Version 4 8 November 2016 149...

Страница 150: ...ion of input level duration and frequency CROS Contralateral Routing Of Signals a type of hearing aid in which the microphone is at the ear opposite to the one receiving the amplified sound CORFIG cou...

Страница 151: ...value of the total signal may be used instead of the fundamental HFA High Frequency Average the average of values in dB at 1000 1600 and 2500 Hz ANSI S3 22 HL Hearing Level the hearing threshold refer...

Страница 152: ...requency a sinusoidal acoustic signal 1 REAG Real Ear Aided Gain difference in dB as a function of frequency between the SPL or BSPL at a specified measurement point in the ear canal and the SPL or BS...

Страница 153: ...oduced by Audioscan in 1992 It presents hearing threshold UCL and amplified speech spectra as SPL in the ear canal The fitting goal is to make amplified speech audible and comfortable while avoiding d...

Страница 154: ...a specified stimulus that is judged to be definitely uncomfortable Volume Control a user operated gain control Wideband the extension of the frequency response bandwidth from 8kHz to 16kHz WRECD Wideb...

Страница 155: ...an K et al 1994 An international comparison of long term average speech spectra Journal of the Acoustical Society of America vol 96 No 4 Oct 1994 2108 2120 Byrne D 1977 The speech spectrum Some aspect...

Страница 156: ...to coupler differences in children with grommets British Journal of Audiology 31 63 69 McInerney C Tang J Zelmer D Scollie S 2016 Development of a Cantonese Speech Passage for Hearing Aid Evaluation...

Страница 157: ...aracteristics for young hearing impaired children Ear and Hearing 6 1 48 53 Seewald R C Ross M Stelmachowicz P G 1987 Selecting and verifying hearing aid performance characteristics for young children...

Страница 158: ...Verifit User s Guide Version 4 8 November 2016 25 Appendix 1 Manufacturer Disclosure Statement for Medical Device Security 158...

Страница 159: ...Verifit User s Guide Version 4 8 November 2016 159...

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