otometrics Aurical Hit Reference Manual Download Page 36 | Manualshive

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The report

5.3.3

Calibrating the coupler microphone

Coupler microphone calibration must be performed by a certified service technician.

What you need to calibrate

•

94 dB sound level calibrator

•

½ in microphone adapter

36

Otometrics - AURICAL HIT

5 Cleaning, Repair and Calibration

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Summary of Contents for Aurical Hit

Page 1: ...AURICAL HIT and the OTOsuite HIT Module Reference Manual Doc No 7 50 1150 EN 06 Part No 7 50 11500 EN ...

Page 2: ...rved Otometrics the Otometrics Icon AURICAL MADSEN ICS and HORTMANN are registered trademarks of GN Otometrics A S in the U S A and or other countries Version release date 2017 03 12 153432 Technical support Please contact your supplier Otometrics AURICAL HIT 2 ...

Page 3: ...g instruments 15 3 1 Calibrating the reference microphone 15 3 2 Positioning the hearing instrument for testing 16 3 2 1 General guidelines for positioning the hearing instrument 16 3 2 2 Using the battery simulator 18 3 2 3 Coupler adapters 19 3 3 Traditional BTE hearing instruments 20 3 3 1 With BTE adapter tube 20 3 4 Thin tube hearing instruments 21 3 4 1 Using the HA 1 ITE RIE thin tube adapt...

Page 4: ...n 34 5 3 1 How often is calibration necessary 34 5 3 2 Environment Report 34 Procedure 34 5 3 3 Calibrating the coupler microphone 36 5 4 The battery simulator 37 6 Troubleshooting 38 7 Standards and Safety 39 7 1 AURICAL HIT 39 7 2 Warning notes 39 7 3 The OTOsuite HIT Module 40 7 4 Manufacturer 41 7 4 1 Responsibility of the manufacturer 41 8 Technical specifications 42 Index 45 4 Otometrics AUR...

Page 5: ...se can be recorded without having AURICAL HIT at hand and coupler based fitting can be performed by itself without using AURICAL FreeFit Coupler based fitting using RECD is a coupler mode as part of the PMM functionality for providing simple hearing instru ment fitting Coupler based fitting is described in the AURICAL FreeFit and the Probe Microphone Measurements User Manual AURICAL HIT supports s...

Page 6: ... there is a risk of death or serious injury to the user or patient Caution Indicates that there is a risk of injury to the user or patient or risk of damage to data or the device Note Indicates that you should take special notice 1 2 1 Navigating this manual Menus icons and functions to select are shown in bold type as for instance in Click the Set options icon on the toolbar or select Tools Optio...

Page 7: ... to comply with the ANSI S3 22 standard place the system in a moderately quiet room 2 2 1 Connecting AURICAL HIT 1 Install OTOsuite on the PC See the OTOsuite Installation Manual 2 Connect the USB cable from the USB socket under AURICAL HIT to a USB socket in the PC AURICAL HIT is powered by the PC AURICAL HIT is selected automatically in OTOsuite If you wish to use a demo device select Tools Conf...

Page 8: ... assembly 9 D Battery simulator 11 E Cable groove 11 F Elevation plate 11 G Coupler microphone sockets 12 H Sound absorbing foam lining 12 I Main loudspeaker 12 J Rear loudspeaker 12 K The AURICAL HIT lid 12 L Telecoils 12 8 Otometrics AURICAL HIT 2 AURICAL HIT ...

Page 9: ...be bent to correctly position the microphone or microphones of the hearing instrument in relation to the main loudspeaker It is used for verification of BTE hearing instruments as well as for measuring the coupler portion of RECD The adapter tube is compliant with ANSI and IEC requirements 2 3 3 The coupler assembly The coupler assembly consists of the following parts A Coupler adapter B Coupler c...

Page 10: ...icrophone The coupler microphone is located in a coupler bottom piece which must be attached to the coupler cavity You can use the coupler microphone either directly in AURICAL HIT or in the Accessory Box The system automatically detects and activates the coupler microphone regardless of which setup you are using AURICAL HIT A BTE testing Low coupler position B ITE RIE thin tube testing High coupl...

Page 11: ...avoid unnecessary battery waste for the purpose of coupler measurements See Using the battery simulator 18 2 3 5 Cable groove Wrap the programming cable of the hearing instrument once around the cable groove This prevents the hearing instrument from being pulled out of place when you close the lid for testing 2 3 6 Elevation plate Use the elevation plate to facilitate positioning of wireless trans...

Page 12: ...speaker presents the signal from behind the hearing instruments and is used for directional microphone test ing 2 3 11 The AURICAL HIT lid The lid of AURICAL HIT has a closing mechanism that prevents the lid from slamming shut which could upset the position of the hearing instrument for testing Opening the lid To open the lid use only one hand to lift the lid gently Closing the lid To close the li...

Page 13: ...ed with a carrying handle The handle is designed for carrying AURICAL HIT Caution If you carry AURICAL HIT by its handle do not use your other hand to support it by the lid as this may cause the lid to open and squeeze your fingers Otometrics AURICAL HIT 13 2 AURICAL HIT ...

Page 14: ...nd fits in the test chamber when not in use The Accessory Box serves as holder for the coupler micro phone for testing hearing instruments outside AURICAL HIT See The coupler assembly 9 Caution Do not place the Accessory Box inside AURICAL HIT during transportation 14 Otometrics AURICAL HIT 2 AURICAL HIT ...

Page 15: ...g the reference microphone 15 2 Positioning the hearing instrument General instructions are described in Traditional BTE hearing instruments 20 Thin tube hearing instruments 21 ITE hearing instruments 22 3 Testing When you have positioned the hearing instrument correctly you can test it using the OTOsuite HIT module as described in Testing the hearing instrument with OTOsuite HIT 26 or you can per...

Page 16: ...hone of the hearing instrument without touching it Single microphone omni mode If the hearing instrument is not capable of single microphone omni mode it is recommended that you position the hearing instrument at a 90 angle so that the distance is the same between the AURICAL HIT main loudspeaker and the two hearing instrument microphones This also means that you must reposition the hearing instru...

Page 17: ...TE 2 Positioning the reference microphone As a rule of thumb position the reference microphone as close as possible to the front microphone of the hearing instrument without actually touching it Maximum permitted distances are Vertically Y axis 8 mm above Sideways X axis 12 mm Back to front Z axis 3 mm Otometrics AURICAL HIT 17 3 Testing hearing instruments ...

Page 18: ...e hearing instrument With AURICAL HIT you receive a set of color coded battery simulators which are used to power the hearing instru ment They are also used as probes for measuring the power consumption Color code Size IEC ANSI Red 5 PR63 7012ZD 18 Otometrics AURICAL HIT 3 Testing hearing instruments ...

Page 19: ...battery simulator Caution When you have connected the battery simulator make sure that it does not touch other metal parts as this may short circuit the system 3 2 3 Coupler adapters Adapters for use with the coupler are snapped onto the coupler cavity The adapters in the Accessory Box make it easy to position hearing instru ments in the test chamber for testing HA 2 BTE Traditional BTE hearing in...

Page 20: ...hearing instrument 16 3 3 1 With BTE adapter tube 1 Attach the BTE adapter tube to the tube stub on the HA 2 BTE adapter The tube must completely cover the tube stub on the adapter If a metal wire protrudes from the BTE adapter tube turn the tube upside down or use a new one 2 Attach the hearing instrument to the free end of the BTE adapter tube so that the metal wires in the tube align with the s...

Page 21: ...ar piece from the thin tube 2 Wrap a thin roll of acoustic putty around the end of the thin tube 3 Place the thin tube in the center of the hole in the HA 1 adapter so that the thin tube s entry hole is flush with the underside of the adapter 4 Press the acoustic putty firmly around the thin tube 5 Position the hearing instrument horizontally on a piece of acoustic putty on the surface of the adap...

Page 22: ...earing instruments This procedure applies to any type of custom hearing instruments including ITE In The Ear ITC In The Canal CIC Com pletely In the Canal Positioning the hearing instrument for directional testing is described in General guidelines for positioning the hearing instrument 16 1 Wrap a thin roll of acoustic putty around the receiver end of the hearing instrument 22 Otometrics AURICAL ...

Page 23: ...earing instrument into place on the coupler and place the coupler in the high position in AURICAL HIT 4 Align the microphones along the loudspeaker axis 5 Position the reference microphone as close as possible to the front microphone of the hearing instrument without touching 6 Close the lid You are ready to start testing Otometrics AURICAL HIT 23 3 Testing hearing instruments ...

Page 24: ...g instrument with FM receiver Coupler assembly adapter coupler cavity and coupler microphone placed in Accessory Box Coupler cable between Accessory Box and AURICAL HIT Insulating pad under Accessory Box Acoustic putty sealing material such as Bostik Blu Tack The measurement procedures described below serve as a guideline to show the intended workflow This includes a description of how to use the ...

Page 25: ...e of the Accessory Box and place the Accessory Box on an insulating pad to prevent noise and vibration from influencing the test 3 Raise the elevation plate in the test chamber 4 Make sure that you have removed the material used to muffle the FM transmitter microphone for the reference measurements For FM transmitter with built in microphone Place the FM transmitter on the elevation plate in the t...

Page 26: ...speaker axis 3 Remove the ear mold if any from the ear piece and attach the ear piece to the adapter 4 Connect the coupler cable from the Accessory Box to AURICAL HIT 5 Place the ear piece setup in the top position coupler hole of the Accessory Box 6 Close the lid You are ready to start testing 3 9 Testing the hearing instrument with OTOsuite HIT When you have positioned the hearing instrument you...

Page 27: ...u follow the on screen instructions 11 If you wish to redo an individual test click on the Start button next to the test 3 9 2 How to test the directional microphone Directionality measurements as described in the hearing instrument test standards cannot be performed with regular desk top test chambers such as AURICAL HIT Such measurements require large anechoic chambers Small test chambers always...

Page 28: ...rectionality of the hearing instrument is fully efficient 3 You can either combine the Directional Test with your standard test sequence by checking the sequence checkbox or run it separately by clicking the Start button The result The Directional Test result is shown as a 1 3 octave curve of the difference between the measurement with noise presen ted from the main loudspeaker and the measurement...

Page 29: ... when you use OTOsuite with Noah together with the fit ting software for the hearing instrument 4 Position the hearing instrument as described in Testing hearing instruments 15 so that it is ready for testing 5 Close the lid 6 Click the Start button in the top left corner of the Measurements table This will start the selected test s 4 1 Navigating in HIT FreeStyle The Measurements table You can us...

Page 30: ...st You can run the current test settings in the Control Panel as a test by clicking the Start button in the Measure part of the Control Panel You can run a test sequence by clicking the Start button in the top left corner of the Measurements table Redoing a measurement You can click any existing measurement in the table to load its settings You can then repeat the measurement by starting it at the...

Page 31: ... is particularly useful to estab lish the harmonic distortion of the tested device Live Measures without any signal Useful for measuring sus ceptibility for background noise Telecoil Presents a frequency sweep within the range defined The stimulus level is defined as mA m Input Output Presents the single tone at several levels and meas ures the output as a function of each input level Combining se...

Page 32: ...e base area of the test chamber can be replaced See Replacing floor lining 33 Replacement of the foam lining should only be performed by authorized service per sonnel Calibration The reference microphone should be calibrated regularly See Calibrating the reference microphone 15 If a new coupler microphone has been taken into use see Calibrating the coupler microphone 36 5 1 Cleaning There are no s...

Page 33: ...ct Tools AURICAL HIT Calibration More New Reference Microphone 5 Browse to select the calibration file supplied with the new reference microphone Make sure that the listed microphone serial number matches the serial number of the file 6 Load the file 7 Calibrate the reference microphone with the coupler microphone See Calibrating the reference microphone 15 5 2 2 Replacing updating the coupler mic...

Page 34: ...3 2 Environment Report The Environment Report is a troubleshooting system self test tool which can be used for verifying that the microphones loudspeakers internal electronics and the acoustic chamber are functioning properly Note Make sure that you follow the on screen instructions carefully to obtain correct results The tool executes the following measurements in an automatic sequence 90 dB fron...

Page 35: ...sure this by looking at the test chamber from the side when you adjust the reference microphone position for validation 5 Close the lid 6 Select Tools AURICAL HIT Calibration More Environment Report 7 Click Start The test lasts less than 1 minute Otometrics AURICAL HIT 35 5 Cleaning Repair and Calibration ...

Page 36: ...upler microphone Coupler microphone calibration must be performed by a certified service technician What you need to calibrate 94 dB sound level calibrator in microphone adapter 36 Otometrics AURICAL HIT 5 Cleaning Repair and Calibration ...

Page 37: ...eference microphone See Cal ibrating the reference microphone 15 5 4 The battery simulator A 1 8 stereo jack supplies direct current from AURICAL HIT to a battery which is inserted into the battery compartment of the hearing instrument during testing The voltage and source impedance of the battery simulator are controlled by the test software and the current can be measured by the simulator and th...

Page 38: ...ake a Validation Report recalibrate and repeat the sequence above 7 If test results still seem incorrect replace the relevant microphone and calibrate the new microphone Too much ambi ent noise In order to exclude ambient noise and to comply with the ANSI S3 22 standard place the system in a moderately quiet room If noise enters the test chamber try moving the device a little as this can cause big...

Page 39: ...s supplier You can also con tact your local authorities for advice on disposal Consult user manual for warnings and cautions Consult instructions for use Complies with Medical Devices Directive 93 42 EEC and RoHS Directive 2011 65 EC UL listing mark USB socket for connecting AURICAL HIT to a computer Socket for connecting external coupler microphone 7 2 Warning notes Warning For warning notes appl...

Page 40: ...tential damage e g microphone dropped on the floor Note that calibration has been performed only on the microphones supplied If you wish to use other microphones for testing with the device please contact your local distributor first 12 To prevent cross infection use fresh acoustic putty when you test the next hearing instrument 13 For safety reasons and due to effects on EMC accessories connected...

Page 41: ...the equipment only if All assembly operations extensions re adjustments modifications or repairs are carried out by the equipment man ufacturer or personnel authorized by the manufacturer The electrical installation to which the equipment is connected complies with EN IEC requirements The equipment is used in accordance with the instructions for use The manufacturer reserves the right to disclaim ...

Page 42: ...Harmonic distortion acoustic tone out put main loudspeaker Less than 0 5 up to 70 dB SPL Less than 2 0 70 90 dB SPL Acoustic measurements Frequency range coupler microphone equalized 125 to 200 Hz 3 dB 200 to 5000 Hz 1 dB 5000 to 10000 Hz 3 dB Battery simulator Voltage range 0 to 2 0 V Resolution voltage 0 02 V Accuracy voltage 0 05 V Output impedance range 3 to 10 ohm Resolution impedance 0 1 ohm...

Page 43: ...y 80 for temperatures up to 31ºC 88 ºF decreas ing linearly to 50 relative humidity at 40ºC 104 ºF Altitude Up to 2 000 m 6 562 feet Warm up time 15 min Standards AURICAL HIT CE marked according to the Electrical Safety Directive IEC 61010 1 Test standards ANSI S3 22 IEC 60118 7 EMC IEC 61326 1 Accessories BTE adapter tube Coupler set including 2cc coupler and snap on adapters HA 1 ITE HA 2 BTE an...

Page 44: ... Acoustic putty Ear simulator AURICAL HIT Reference Manual AURICAL HIT User Guide 44 Otometrics AURICAL HIT 8 Technical specifications ...

Page 45: ...e description 9 testing hearing instruments 20 testing with adapter tube 20 C Cable groove description 11 Calibration 34 coupler microphone 36 how often 34 initial calibration 7 reference microphone 15 Cleaning 32 accessories 32 device 32 Connecting AURICAL HIT 7 Coupler adapters 19 Coupler assembly 9 Coupler microphone calibration 36 replacement 33 sockets 12 Coupler microphone sockets 12 Coupler...

Page 46: ...26 telecoil testing 24 testing 15 testing in OTOsuite HIT 26 testing wireless transmitters 24 thin tube testing 21 thin tube testing with HA 1 adapter 21 HIT module testing 26 I Induction loops description 12 Initial calibration 7 Installation 7 initial calibration 7 Intended use 5 required user qualifications 5 Introduction 5 ITE hearing instruments testing 22 L Lid description 12 Loudspeaker des...

Page 47: ...ical specifications 42 accessories 43 acoustic measurements 42 acoustic stimulus generation 42 battery simulator 42 dimensions 43 operating conditions 43 standards 43 telecoil 42 transport and storage 43 USB connection 42 weight 43 Telecoil specifications 42 telecoils in AURICAL HIT 12 testing 24 Test chamber Accessory Box 14 battery simulator 11 cable groove 11 coupler assembly 9 coupler micropho...

Page 48: ...hin tube hearing instruments with HA 1 adapter 21 wireless transmitters 24 with BTE adapter tube 20 Thin tube hearing instruments testing 21 testing with HA 1 adapter 21 Thin tube adapter 19 Transport and storage 43 Troubleshooting 38 active screen disappears 38 ambient noise 38 incorrect test results 38 U USB specifications 42 W Warning notes AURICAL HIT 39 Weight 43 Wireless transmitters testing...

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