Operating Manual
Contents
1. Lot son Of Spade C Program tzesunteracouzb SAC 440 Plug in for AuctBasevA_ABControtpanel exe Audiogram clinic ID She default AvdABase C Other Starting AC440 Plug in Open and navigate AuditBase as described in the AuditBase User Manual Start AC440 Plug in when selected as preferred audiometer a Select Measurement in the top tool bar b Choose AB Audiogram c Click the Measure button and the AC440 Plug in will open Tone Audiometry The AC440 Plug in opens in the Tone screen and enables the clinician is able to perform air bone and free field audiometry with or without masking The Tone Screen 4C440 Plug in for AuditBase ie Channel 1 Channel 2 I Bone left 3048 1000 z 304a P J lt Frequency HL NB v ep D D Man Rey Sim Alt g lt gt Stimuli y CO D oo JTL F H Oma O ucl Interacoustics Talk Forward This button will activate Talk Forward that enables the clinician to talk to the client through the talk forward microphone To adjust the sound level of the signal use the slider bars that appear when pressing the talk forward button TalkForward Cal level TT SS mmm 1 wm Intensity 76dB SPL Extended Range 20 dB This button extends the testing range and can be activated when the threshold search reaches 50 dB below the maximum level of the headset Monitoring M of Channel 1 or Channel 2 The check boxes Ch72. Speech 17 Store Not Heard Reset Incorrect Correct Toggle left meas type Toggle right meas type Interrupter Ch1 Interrupter Ch2 Shift R Right Left Z X Left cont space Right cont Tone Speech Speech Speech Tone Speech Tone Speech Tone Speech Weber Tone Speech Weber 18 TE Return Report Form 001 Opr dato 2008 10 03 at EC Rev dato af HNI P Address Drejervaenget 8 Company 5610 Assens Denmark Address ddress Biene 45 63713555 Fax E mail Fax or e mail 2S O info interacoustics com Contact person Date Following item is reported to be _ returned to INTERACOUSTICS for _ repair _ exchange other _ defective as described below with request of assistance _ repaired locally as described below _ showing general problems as described below Item Type Quantity Serial No Supplied by Included parts Important Accessories used together with the item must be included if returned e g external power supply headsets transducers and couplers Description of problem or the performed local repair Returned according to agreement with _ Interacoustics _ Other Date Person Please provide e mail address or fax No to whom Interacoustics may confirm reception of the returned goods _ The above mentioned item is reported to be dangerous to patient or user In order to ensure instant and effective treatment of retur
3. amp UCL Here HL Hearing Level can be selected to do a normal audiometry MCL can be selected in order to test the Most Comfortable Levels or UCL can be chosen to test the Uncomfortable Levels HL Ma UCL Performing Tone Audiometry 1 Open AC440 Plug in through AuditBase described above AuditBase System4 AN Audiogram NyApparat tilkablet Patient 010101 0104 TEST TESTESEN lu Le Bruger SA Lokation Abe WEBER LJ O UU OU UU 40 125 250 500 1000 2000 4000 8000 jg weg KA COM KX ei 40 aB soo Hz Hi pam Select the input and output for Channel 1 using the corresponding dropdowns Using the Channel 2 input and output dropdowns the clinician can decide whether or not masking is to be employed Use the arrow buttons on in the AC440 Plug in PC keyboard or the dedicated keyboard to set the frequency and intensity Present the stimulus by touching the Stimuli area with the mouse pressing S on the PC keyboard or the touch switch on the dedicated keyboard During stimulus presentation the Stimuli area will light up visually letting the clinician no when sound is coming out of the headphones If having to do with a more severe hearing loss the clinician may want to press the Extended Range 20 dB button Speech Audiometry Click on the Speech Tab to enter the speech screen From the speech screen the clinician can present the preferred sp
4. and Ch2 enable the clinician to monitor Channel 1 Channel 2 or both Channels together through an external monitor loudspeaker The monitor intensity is adjusted with the slider Talk Back TB If a microphone is connected to the Talk Back input the clinician has the opportunity to listen to the client through an external loudspeaker when such has been connected to the monitor input Channel i D nn BI amp Channel 2 CFF wt ME Ke Man Rev Sim Alt O Q Output Channel 1 This dropdown provides the option to select output for Ch1 pure tone testing for both ears Right and Left bone conduction testing for both ears Bone R and Bone L free field testing FF1 and FF2 and insert phone testing nsert Right and Insert Left Input Channel 1 The dropdown provides the option to select Tone 1 dB and 5 dB steps This button allows for toggling between using 1 dB and 5 dB intensity steps during the tone audiometry Manual or Reverse presentation in Channel 1 Here the clinician has the option to choose Man manual and thereby present the signal to the client only when the Stimuli Channel 1 is activated Choosing Rev reverse will cause the signal to be presented continuously only disappearing when the Stimuli Channel 1 is activated Pulsation Here the clinician has the option to select between single and continuous pulse presentation Output Channel 2 This dropdown provides the option to select output for Ch2 p
5. be increased with 1 or 5 dB steps with a mouse click This can also be obtained sing the arrow down on the computer keyboard Speech Scoe Word Counter Frequency and Intensity display area On 0 0 AS dB the left side of the black area the dB value for Scoring Store HL Channel 1 300B is shown and on the right side for Channel 2 15dB In the middle of the black area the current Speech Score in and the Word Counter monitors the number of words presented during the test Correct A mouse click on this button will store the word as correctly repeated d A Incorrect A mouse click on this button will store the word as incorrectly repeated Store A mouse click on this button will store the speech threshold in the speech graph dB HL Decrease Channel 2 With the dB HL Decrease button the intensity and A Channel 2 can be decreased with 1 or 5 dB steps with a mouse click This can however also be obtained using the arrow up on the computer keyboard Stimuli Channel 2 When the mouse cursor is above the Stimuli area the Stimuli selected stimulus will be presented If Channel 2 is used for continuous masking noise dB HL Increase Channel 2 With the dB HL Increase button the intensity in Channel 2 can be increased with 1 or 5 dB steps with a mouse click This can however also be obtained using the arrow down on the computer keyboard 11 Frequency increase decrease Clicking on the Frequency buttons the 4 gt frequency w
6. employed Select the desired Speech material using the droodowns Spor 1 k word k Single syllabics k Set the input level using the arrow buttons in the AC440 Plug in PC keyboard or dedicated keyboard Press Play Score the test using the scoring buttons to score and store the speech test lf having to do with a more severe hearing loss the clinician may want to press the Extended Range 20 dB button 13 The Weber Test Click on the Weber Tab to enter the Weber screen Sim Alt From here Weber testing can be performed For details on the Weber test please refer to the Affinity Equinox 2 0 Manual The Weber Screen AC440 Plug in for AuditBase Weber Channel 2 30 dB 1000 Hz Frequency Man Rev Sim Alt Irteracoustics 14 Channel 1 Channel 2 be Lu S Enable Talk Forward This button will activate Talk Forward that enables the clinician to talk to the client through the talk forward microphone To adjust the sound level of the signal use the slider bars that appear when pressing the talk forward button TalkForward x Cal level o mmm gegen Intensity 76dB SPL Extended Range 20 dB This button extends the testing range and can be activated when the threshold search reaches 50 dB below the maximum level of the headset Monitoring M of Channel 1 or Channel 2 The check boxes Ch7 and Ch2 enable the clinician to monitor Channel 1 Channel 2 or both Channe
7. the clinician that the bone conductor is vibrating 17 Auto Save Settings When the AC440 Plug in is closed or another tab tone soeech Weber is selected the the transducers input output selection presentation pulsation and sim alt settings automatically will be saved in the XML file located under the application XML file under C Documents and Settings All Users Application Data Interacoustics IA ABAC440 Plug in xml This XML file is hidden in Windows by default to view it enable Show Hidden Files and Folders We do not recommend manually changing this XML file However experience super user and system administrators may want to change some default settings in the Common section of the XML file Warning f a setting is typed in a wrong format that cannot be read by the AC440 Plug in the XML file will automatically be overwritten by the default settings and the old setting will be lost The following settings can be changed in the Common area SinglePulseLength value between 200 gt 5000 ms MultiPulseLength value between 200 gt 5000 ms DefaultIntensityWhenChangingOutput MinustTen MinusFive LEO Five Ten Fifteen Twenty TwentyFive Thee cy ThirtyFive test FourtyFive KEE OET DefaultIntensityWhenChangingTest MinusTen MinusFive ZELro Five Ten Fifteen Twenty TwentyFive EE ThirtyFive POULTLY FourtyFive Party 18 OEL MonitorLevel value between 10 gt 30 TalkForwardLevel val
8. HL Decrease button the intensity in Channel 1 can be decreased with 1 or 5 dB steps with a mouse click This can also be obtained using the arrow up on the computer keyboard Stimuli Channel 1 Stimuli is presented by pressing space bar or left Ctrl key on the computer keyboard A left mouse click in the Stimuli area will store the threshold at the current position clicking at another intensity at the same frequency will change the threshold to the new position A right mouse click in the Stimuli area will store a no response threshold dB HL Increase Channel 1 With the dB HL Increase button the intensity in Channel 1 can be increased with 1 or 5 dB steps with a mouse click This can also be obtained using the arrow down on the computer keyboard Frequency and Intensity display area On the 1000 Hz 15 JB left side of the black area the dB value for Channel 1 300B is shown and on the right side for Channel 2 15dB In the middle of the black area the current frequency level is shown Frequency HL dB HL Decrease Channel 2 With the dB HL Decrease button the intensity and Channel 2 can be decreased with 1 or 5 dB steps with a mouse click This can however also be obtained using the arrow up on the computer keyboard Stimuli Channel 2 When the mouse cursor is above the Stimuli area the tone noise will be presented If Channel 2 is used for continuous masking noise dB HL Increase Channel 2 With the dB HL Increase button the intensity i
9. Operation Manual AC440 Plug in for AuditBase System 83015301 05 09 AC440 Plug in for AuditBase system Contents Valeo 0 ci 6 D AMNION EEN SE aile RR PU E WEE JEE TEE me Tone Cl ME COPTIC Tone PUNO SY EE PEEN POMS E E E A E Rate E Perlorming Speech AUGIOMEU Y EE 13 The Weber Tee 14 The Weber Gcreen ttrust treset nent nnau nuE A Eu EE LESERE EREEEEE EEEE enean n ena nnnt 14 IVORMMMIFIC OS VV ClO TOS EE 17 AUO AV OSC N EE 18 PO SHI OMI GUNS EA 17 Introduction AuditBase System AB database has a diverse user group in the hospital covering tasks such as patient registration invoicing service and different hearing assessments based on measurements from audiometers and tympanometers This user manual describes the use of AB together with the AC440 Plug in made for the Interacoustics AC440 audiometry module The AuditBase AC440 Plug in gives a condensed access to the AC440 audiometer module and accommodates for the air bone speech SRT WR and WR in noise process with or without masking depending on the character of the hearing loss The application appears as a control panel on top of the AB application where the user controls the instrument and the result of the measurement is simultaneously shown on the AB Audiogram This makes it possible for clinicians to record audiograms very fast and efficiently and get an overview of the hearing impairment For in depth information regarding audiometry usi
10. ame frequency will change the threshold to the new position A right mouse Click in the Stimuli area will store a no response threshold Somul dB HL Increase Channel 1 With the dB HL Increase button the intensity in A Channel 1 can be increased with 1 or 5 dB steps with a mouse click This can also be obtained sing the arrow down on the computer keyboard Frequency and Intensity display area On the 3008 1000 Hz 15B left side of the black area the dB value for Channel 1 30 dB is shown and on the right side for Channel 2 15 dB In the middle of the black area the current frequency level is shown HL e Frequency HL dB HL Decrease Channel 2 With the dB HL Decrease button the intensity A and Channel 2 can be decreased with 1 or 5 dB steps with a mouse click This can however also be obtained using the arrow up on the computer keyboard Stimuli Channel 2 The noise will be muted when the mouse is over the Stimuli area or when right Ctrl key is pressed dB HL Increase Channel 2 With the dB HL Increase button the intensity in e Channel 2 can be increased with 1 or 5 dB steps with a mouse click This can however also be obtained using the arrow up on the computer keyboard Frequency increase decrease Clicking on the Frequency buttons the gt frequency will be increased or decreased depending on the chosen direction This can also be obtained using the arrow to the left or right on the computer keyboard HL MCL
11. eech material and score the test The Speech Screen 4C440 Plug in for Audithbase Le Channel 1 Ward Counter Channel 2 Speech Score cme OS o Oe HL Scoring Store HL Man Rev JL JUL Man Rev Sim Alt We v d Y ee Ctrl O O SRT ua wR wre park Sub dm o ul nab spalt skratt past glatt Hart salt Wass sol trait tring k k fort pang ling S KA Svensk Talaudiome ze FB Liata 1 Ww word v Single syllabics v ELC es TE JS Ge a gt Talk Forward This button will activate Talk Forward that enables the d clinician to talk to the client through the talk forward microphone To adjust the sound level of the signal use the slider bars that appear when pressing the talk forward button TalkForward x C al level o Mu Ss Intensity 76dB SPL Channel 1 g Channel 2 OFF Man Rev CH Extended Range 20 dB This button extends the testing range and can be activated when the threshold search reaches 50 dB below the maximum level of the headset Monitoring M of Channel 1 or Channel 2 The check boxes Ch7 and Ch2 enable the clinician to monitor Channel 1 Channel 2 or both Channels together through an external monitor loudspeaker The monitor intensity is adjusted with the slider Talk Back TB If a microphone is connected to the Talk Back input the clinician has the opportunity to listen to the client through an external loudspeaker when such has b
12. een connected to the monitor input Output Channel 1 This dropdown provides the option to select speech testing output for both ears Right and Left bone conduction testing for both ears Bone Right and Bone Left free field testing FF7 and FF2 and if using insert phones Insert Right and Insert Left as output for Channel 1 Input Channel 1 The dropdown provides the option to select microphone CD player or Wave files Mic1 Mic2 CD1 CD2 or Wave file as input for Channel 1 1 dB and 5 dB steps This button allows for toggling between using 1 dB and 5 dB intensity steps during the speech audiometry Pulsation Here the clinician has the option to select between Single Pulse and Multi Pulse presentation Manual or Reverse presentation in Channel 1 Here the clinician has the option to choose Man and thereby present the signal to the client only when the stimuli speech signal of Channel 1 is activated Choosing Rev will cause the signal to be presented continuously only disappearing when the stimuli speech signal of Channel 1 is activated Output Channel 2 This dropdown provides the option to select speech testing output for both ears Aight and Left Insert mask for masking via an insert phone free field testing FF7 and FF2 and if using insert phones Insert Right and Insert Left as output for Channel 2 This channel can also be set to Off if masking or binaural stimulation is not wanted Input Channel 2 The dropdown prov
13. ical speech norm curves AC440 Plug in for Audithase W Audceometer appiec atior E Mean value configurations 3 Test C User settings O Workstation settings 3 Press the Test button 4 Choose the new audiometer application path as shown on the screenshot below 5 Audcitiase AGempnpsiraison i Workstation settings Audiogram Efe Toots tiep LJ General settings CJ Waiting ist settings J Appointment definitions CI Treatment summary defrtions J Earmould definitions C Paediaine defritions LJ Event defrtions CJ Diagnosis definitions LJ Journal definitions CJ Stock definitions J irvoice definitions CJ Repair definitions CJ Task Est definitions CI Referring agent settings LJ Referral settings C Dot unge and attachenent settings LJ Other defirntions C Symbols CJ User admirestration PAS integration L Data recovery CJ Printing Output extension LJ Location definitions CJ Versions and updates J Audiogram settings CJ User settings J Workstation settings W Audiogran COUP setup Di Other View Audiograrn wiew Single Split C Large Custom 100 W Weber at startup T Speech banana af startup Masking values at startup l Extended range at startup Graphical speech setings Show noe curve on graphical speech audiogram None ingerate Aucometer Audiometer 10 Audiometer type oF Communication method O None C COM pon 00923 z Got e M itera e Driven by extemal application Appikatonname i
14. ides the option to select microphone Mic1 and Mic2 Insert mask for masking via an insert phone CD material CD71 and CD2 White Noise WN Speech Noise SN and Wave files as input for Channel 2 Manual or Reverse presentation in Channel 2 Here the clinician has the option to choose Man and thereby present the signal to the client only when the stimuli soeech signal of Channel 2 is activated Choosing Rev will cause the signal to be presented continuously only disappearing when the Stimuli 10 Channel 2 is activated Sim Alt Simultaneous Alternate Here the clinician has the option to select O Q presentation in both channels Sim by locking Channel 1 and Channel 2 together or to have the presentation in the two channels alternating to each other Alt dB HL Decrease Channel 1 With the dB HL Decrease button the intensity in Channel 1 can be decreased with 1 or 5 dB steps with a mouse Click This can also be obtained using the arrow up on the computer keyboard Stimuli Channel 1 Stimuli is presented by pressing space bar or left Ctrl key on the computer keyboard A left mouse click in the Stimuli area will store the threshold at the current position clicking at another intensity at the same frequency will change the threshold to the new position A right mouse Click in the Stimuli area will store a no response threshold l Stimuli dB HL Increase Channel 1 With the dB HL Increase button the intensity in v Channel 1 can
15. ill be increased or decreased depending on the chosen direction This can also be obtained using the arrow to the left or right on the computer keyboard SAT Guc wRi CO wre habn z s bred kat hari stok gr s el jord zed Spor 1 K Word K Single syllabics sl SRT UCL WR1 amp WR2 Here the clinician can choose which test to perform Select between SRT Speech Recognition Threshold UCL Uncomfortable Level WR1 and WR2 Word Recognition Speech Presentation In this area the selected material is shown Upon presentation the word is yellow Depending on the correct incorrect score they become green or red respectively Type of Speech Material Using these dropdowns the clinician can select the preferred type of material for the speech test Play Pause Stop Using these buttons the clinician can control the speech test 12 Performing Speech Audiometry 1 Open AC440 Plug in through AuditBase and go to the Speech screen by clicking the Speech tab C Auditiiase System4 A Audiogram Patient 010101 0104 TEST TESTESEN sl Le Bruger SA Lokation Abe WEBER LJ O UU UU OL 125 250 500 1000 82000 4000 8000 RUCOYKR Be Irfomahon Tale Tymp Sammerign Gratck tale Ande Vertibudee Select the input and output for Channel 1 using the corresponding dropdowns Using the Channel 2 input and output dropdowns the clinician can decide whether or not masking is to be
16. ls together through an external monitor loudspeaker if a loudspeaker has been connected to the monitor input The monitor intensity is adjusted with the slider Talk Back TB If equipped with a microphone connected to the Talk Back input the clinician has the opportunity listen to the client through an external loudspeaker when such has been connected to the monitor input Output Channel 1 and 2 These dropdowns are grayed out as the Weber settings are fixed Input Channel 1 and 2 These dropdowns are grayed out as the Weber settings are fixed 1 dB and 5 dB steps This button allows for toggling between using 1 dB and 5 dB intensity steps during the Weber test Synchrony This button will lock synchronize the Channel 1 attenuator to the Channel 2 attenuator Manual or Reverse presentation in Channel 1 and 2 Here the clinician has the option to choose Man manual and thereby present the signal to the client only when the Stimuli Channel 1 is activated Choosing Rev reverse will 15 D nn EI P Sim At QO cause the signal to be presented continuously only disappearing when the Stimuli Channel 1is activated For Channel 2 Man and Rev are grayed out as the Weber settings are fixed Pulsation Here the clinician has the option to select between single and continuous pulse presentation Simultaneous Alternate This function is grayed out as the Weber settings are fixed dB HL Decrease Channel 1 With the dB
17. n Channel 2 can be increased with 1 or 5 dB steps with a mouse click This can however also be obtained using the arrow down on the computer keyboard Frequency increase decrease Clicking on the Frequency buttons the frequency will be increased or decreased depending on the chosen direction This can also be obtained using the arrow to the left or right on the computer keyboard 16 Performing the Weber Test 1 Open the AC440 Plug in through AuditBase and go the Weber screen by clicking the Weber tab C Auditiase System LAN Audiogram lt NyApparat tilkablet Patient 010101 0104 TEST TESTESEN AL lp Bruger SA Lokation Alle WEBER O U UU d OU x 125 250 500 1000 2000 4000 8000 LE 5 k RU COV RR Se 40 Ap 750 Hz bil H jre MSlingsresultat Midcelverdier peat Ko LI BEN Fexherhndx Spargsmat Fe TRH status info Undersogt af M Normal M Normal Infoomahon Tale Typ Sammerign Dusch tale Andee Vestibular 2 The input and output for channel and 2 are not preset for the Weber test and therefore grayed out 3 Use either the arrow buttons on the AC440 Plug in the PC keyboard or the dedicated keyboard to set the frequency and intensity 4 Present the stimulus by either touching the Stimuli area with the mouse pressing S on the PC keyboard or the touch switch on the dedicated keyboard During stimulus presentation the Stimuli area will light up visually letting
18. ned goods it is important that this form is filled in and placed together with the item Please note that the goods must be carefully packed preferably in original packing in order to avoid damage during transport Packing material may be ordered from Interacoustics EC Medical Device Directive rules require immediate report to be sent if the device by malfunction deterioration of performance or characteristics and or by inadequacy in labelling or instructions for use has caused or could have caused death or serious deterioration of health to patient or user 19
19. ng the Affinity Equinox please refer to the Affinity Equinox User Manual Read more at www interacoustics com Installation To install the AC440 Plug in please follow the following four steps 1 Insert the installation CD and run the installation file if it does not start automatically 2 Start AuditBase Administration and add a new audiometer application as shown on screenshot below s Audithase Administration Audiogpram settings Audiometer applications Die Tools tep CO General settings J Waiting list settings J Appointment definitions CI Treatment summary defintions O Earmould definitions C Paediatric definitions C Evert definiteons O Diagnoses definitions Gi Journal definitions C Stock definitions LJ Irwoice defintions D Repair definitions C Task list definitions J Refernng agent settings Selected application C Referral settings O Document and attachment setting Name fia Pom 4 O Other definitions Jj Symbols Default location of the application exe file contact manufacturer for additional parameters C User administration C PROGRAM FILESINTERACOUSTICSC amp 40 PLUGIN FOR AUDITBASEUA ABCONT J PAS integration CI Data recovery To enable communication of Aud Base and application J Printing Output extension enter Class Narne provided by manufacturer O Location definitions O Versions and updates Ly Audeogram settmgs and for applic ation window titie E General settings II Graph
20. ue between 10 gt 30 TalkForwardIntenity value between 0 gt 120 SPL TalkbackLevel value between 0 gt 100 SPL IntensityDecreseFrequencySteps bes Five Ten Fifteen Twenty TwentyFive PHATEY ThirtyFive FPOUETY IgnoreMouseOverTouchSwitch rrue False Ch ZOppostteChlO outout eat False 19 PC Shortcuts Function Tone Test Speech Test Weber Test Toggle TF Toggle TB Toggle Extended Range Toggle Monitor for Ch1 Toggle Monitor for Ch2 Iterate Output Chi Iterate Input Chi lterate Output Ch2 Iterate Input Ch2 Manual Ch1 Reverse Ch1 Manual Ch2 Reverse Ch2 Synchronize Ch2 Alternate Ch2 Puls Multi puls Continuous Toggle Synchrone Right Left Freq up Freq down dB up Ch1 dB down Chi dB up Ch2 dB down Ch2 Store Heard Hotkey F5 F7 F8 Shift F 1 Shift F2 Shift F3 Shift F4 Shift F5 Alt 8 Alt 9 Alt 0 Right Left down up Page down Page up S Test Speech Weber Tone Weber Tone Speech Tone Speech Weber Tone Speech Weber Tone Speech Tone Speech Weber Tone Speech Weber Tone Speech Tone Speech Tone Speech Tone Speech Tone Speech Weber Tone Speech Weber Tone Speech Tone Speech Tone Speech Tone Speech Tone Speech Weber Tone Speech Weber Tone Speech Weber Tone Speech Weber Tone Speech Tone Speech Tone Weber Tone Weber Tone Speech Weber Tone Speech Tone Speech Tone Speech Tone
21. ure tone testing for both ears Right and Left masking using an insert phone Insert Mask free field testing FF 7 and FF2 and insert phone testing nsert Right and nsert Left The Channel 2 can also be set to be Off if masking is unnecessary Input Channel 2 This dropdown provides the option to select Jone NB Narrow Band Noise and WN White Noise as input for Channel 2 Synchrony This button will lock synchronize the Channel 2 attenuator to the Channel 1 attenuator Manual or Reverse presentation in Channel 2 Here the clinician has the option to choose Man and thereby present the signal to the client only when the Stimuli Channel 2 is activated Choosing Rev will cause the signal to be presented continuously only disappearing when the Stimuli Channel 2 is activated Simultaneous Alternate Here the clinician has the option to select presentation in both channels Sim by locking Channel 1 and Channel 2 together or to have the presentation in the two channels alternating to each other Alt dB HL Decrease Channel 1 With the dB HL Decrease button the intensity in Channel 1 can be decreased with 1 or 5 dB steps with a mouse click This can also be obtained using the arrow up on the computer keyboard Stimuli Channel 1 Stimuli is presented by pressing space bar or left Ctrl key on the computer keyboard A left mouse click in the Stimuli area will store the threshold at the current position clicking at another intensity at the s
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