Impedance Audiometer AT235h

AT235hApplicationsThe AT235h is an automatic impedanceaudiometer well suited for clinics doingscreening, as well as diagnostic work. Neonatal screening programs will par-ticularly appreciate the presence ofhigh probetone tympanometry, allowingmore reliable tympanometric results inneonates.Ease of operation has been the primarydesign criteria, but not at the expenseof testing flexibility.The test battery includes tympanome-try, acoustic reflex testing, ipsilateraland contralateral reflex decay testing,eustachian tube function test and ACaudiometry. Tympanometry is very fast, and for thesubsequent reflex test there is a choiceof two different automated test proto-cols. Manual reflex testing is availablealso for those who need to do more indepth analyses, or if part of the auto-matically obtained results needs modifi-cation. The choice between either a traditionalscreening probe system or a clinicalprobe system allows the instrument tobe well matched to the patient popula-tion.

Probe SystemsThe standard supplied probe is a clini-cal type with detached probe tip.This allows for secure tests of e.g.acoustic reflex decay, and also makesfitting to neonatal ears easier.A traditional pencil type screening pro-be is available as an option.

Children’s TrainA train may be displayed on the screen,to get the attention of the child. Testresults can be monitored simultaneous-ly with displaying the train.

High Frequency TympanometryIn addition to the standard 226Hz pro-betone tympanogram, it is possible torecord a similar tympanogram using ahigher frequency probetone. As differ-ent screening protocols call for differentfrequencies of the high probetone, theAT235h offers 678Hz, 800Hz or 1000Hzas selected by the user.A tympanogram recorded using one ofthe high probetones is generally con-sidered better suited for screening ofneonates than tympanograms obtainedusing the traditional 226Hz probetone.

Normal TympanometryInteracoustics’ endless airflow tech-nique used in the AT235h is the perfectway to ensure proper function in diffi-cult test situations, for example withcrying or fidgeting children. In such situations, an intermittent seal in theinitial test phase will never result in timeconsuming resetting periods.Another unique feature is the intelli-gently controlled pump system, whichincorporates an adaptive speed control.This combines a very fast test speedwith high resolution of the tympano-gram peak that traditionally is onlyavailable by using slower pumpspeeds.

Tympanogram and reflex test results dis-played simultaneously.

High frequency screening tympanometryrecords the IYI tympanogram.

A moving train may help to keep childrenquiet during testing.

Two Automatic ReflexTestsReflex testing is very easy, but allowsalso those in need of versatility to con-trol all details of the test. Two separatetest protocols may be programmed andeither may be selected by the push of abutton. All parameters are easily pro-grammable by the end user if the sup-plied tests are not optimum suited fortest routines of the clinic. In addition totesting with a set of fixed intensities,available automated functions includeautomatic intensity search and auto-matic test for reflex growth. The AT235h does not restrict mixing ofipsi and contra stimuli and also featuresnoise for stimulation. There are few limitations on storing andprinting of reflex results, as more than40 reflexes may be stored per ear.Reflex test with full manual stimuluscontrol is also available, and this manu-al function also allows repeating orchanging test result obtained by one ofthe automatic test protocols.

Decay – Contra andIpsiAcoustic reflex decay test is availablewith ipsilateral stimulation as well aswith contralateral stimulation.

ETF TestTest of the eustachian tube for earswith normal eardrums is available.

AudiometryAudiometry is available through anindependent headset with two phones(optional).The test may be run manually or auto-matically, and for patient comfort, themaximum output may be reduced ifneeded.

Printing OptionsThe built-in fast thermal printer allowsprintout of all test results. Alternativelyan ink-jet or laser printer may be con-nected directly to AT235h for printout oftest results. If used with one of Intera-coustics’ databases or NOAH, printoutsare also available through the PC.Printer share between AT235h and oth-er Interacoustics audiometers is avail-able with the built in thermal printer.The AT235h is also available withoutthermal printer as model AT235h-xp.

Windows BasedSoftwareAll data obtained may be transferred toone of the following Windows basedsoftware programs:PrintView enables monitoring of theAT235h and the printing of test results.In developing this software maximumattention has been given to providing aprogram which is easy to use.IaBase95 is similar to PrintView butincorporates a database for generalpatient data and hearing aid informa-tion.NOAH hearing aid fitting software mayalso be used for storing data from theAT235h.

A group of increasing stimuli for reflextesting, clearly displays reflex growth.

Automated Eustachian Tube test isavailable.

Various included and optional parts. An optional dedicated carrying case isavailable.

PortabilityA convenient lightweight carrying case(optional) will hold the AT235h and allof its accessories.

AAT235h SpecificationsT235h Specifications

OrOrdering Infordering Informationmation

Manufactured by:InteracousticsPhone: +45 6371 3555Fax: +45 6371 3522E-mail: info@interacoustics.dkMail: Interacoustics,

DK-5610 Assens, Denmark

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Standards:Safety: EN 60601-1, Class I, Type BEMC: EN 60601-1-2Impedance: EN 61027/ANSI S3.39 Type 1Audiometer: EN 60645-1/ANSI S.3.39 Type 4 Tone

Medical CE-mark: The CE-mark indi-cates that Interacoustics A/S meets therequirements of Annex VI of the MedicalDevice Directive 93/42/EEC. Approval ismade by TÜV - identification no. 0123.

Tympanometry:Probe tone:Frequency: 226Hz all functions. 678Hz, 800Hz1000Hz for traditional IYI-curve tympanometryLevel: 85 db SPLGain Control: AGC

Air pressure:Control: AutomaticRange: Default +200 to –400daPa(max. +300 to -600daPa)Safety limitation: -800 daPa and +600 daPaPressure change rate: Selectable in the set-upbetween 50, 150 and >250 daPa/s or automaticCompliance:Range: 0.1 to 6.0 ml (numerical: 0.1 to 8.0 ml)

Function:Automatic, where pump speed, start- and stoppressure can be user-programmed in the set-up.

Eustachian Tube FunctionWilliams test, for normal ear drums.

Acoustic Reflex Functions:Test Types:Automatic Reflex:Two independent user selectable protocols. Series of fixed intensities available. Automated intensity search functions available forthreshold search and reflex growth indication.Free mixing of Ipsi and Contra.Manual Reflex:Manual control of all stimuli.May also be used to redo part of automated testresults.Reflex Decay:Manual control, with stimulus duration of 10 sec.Ipsi or Contralateral Stimulation.

Maximum Intensities:

For safety / comfort reasons an optional limitationof maximum intensity is available.

Contra Earphone: THD39 or insert receiver CIR22 (optional)

Attenuator: 1dB or 5dB steps.

Memory:Internal memory for two ears.Each ear: 6 Ipsi and 6 Contra recordings. Eachmay have up to 6 stimuli. Also, there is memory foradditional manual reflex recordings. (Total max. 78reflexes per ear).

Audiometer Functions:Patient Response:Connection for patient response switch.

Outputs:Contra TDH39 headset may be used for audio-metry.Double TDH39 Headset for audiometry (optional)

Test types:Manual Audiometry.Automatic Audiometry according to ISO 8253-1(Patient controlled Hughson-Westlake).

Various:RS232:Input/output for computer communication. Onemode allows an external PC to both monitor andcontrol the instrument. The control actions can befollowed on the display and operation panel.Online communication, where the measurementdata are sent to an external PC, can be selected.

Keyboard:Connection for external keyboard, standard PCtype.

Printer:Built in fast thermal printer with paper width: 112 mmConnection for external laser or ink-jet printer:Language: HP PCL L3 for HP DeskJet and IBMmode for Cannon Bubble jet.

Accuracy:Stimulation Frequencies:± 1 %Probe tone frequency: ±1 HzProbe tone level: 85 dB SPL ± 1.5 dB measured inan IEC126 acoustic coupler. AGC for ear canalcompensation.Pressure measurement: ± 5% or 10 daPa,whichever is greaterCompliance measurement: ± 5% or 0.1 ml,whichever is greater

Examples of Compatible Windows Software:IaBase95 Database Program.PrintView for PC monitoring and printingIA-NOAH-Imp Module for interfacing to NOAH

Construction: Plastic cabinet

Power supply: UPS400 (Included) 100-240V

Warm up time: 10 minutes at room temperature(200 C).

Consumption: 15VA, max. 45VA

Dimensions: LxWxH 36x26x10 cm/ 14x10x4 inchesWeight: 2.8 kg / 6 lbs.

Air Freight Packing: 48x31x37 cm / 19x22.2x14.6 inches. Gross weight: 6.5 kg / 12.4 lbs.

Probe option:AT235-ATP Standard Probe System

Printer option:AT235h-xp is identical to the AT235h but has nobuilt-in printer. Suitable for installations wherecomputer connection takes care of printing, orwhere external printer is connected.

Included Parts:AT235h-ATP Clinical Probe SystemTDH39 Single Contralateral EarphoneUPS400 External Switch Mode Power SupplyPower Cable (110/220V, please specify)BET50 Box of 65 assorted EartipsTPR35 3 Rolls of Recording PaperPCR-AT235 Dust CoverOperation/Service/Multilingual CE manuals

Optional AccessoriesTDH39 Audiometric HeadsetEAR-Tone3A Insert Phones for AudiometryACC35 Carrying CaseCIR22 Contralateral Insert Phone APS2 Patient SignalCAT-222 Calibration Unit 0.2 and 5 mlCAT-227 Calibration Unit 0.2-0.5-1-2-3-4-5 mlIES-2 Impedance Ear Simulator

Freq. Ipsi Contra Contra AudiometryHz TDH39 CIR22 AC dBHL AC dBHL

TDH39 EARTone3A

125 90 90

250 - 110 90 110 105

500 105 120 100 120 110

750 120 115

1000 110 120 110 120 120

1500 120 120

2000 105 120 110 120 120

3000 100 120 110 120 120

4000 100 120 110 120 115

6000 - 120 - 120 100

8000 - 110 - 110 95

WN 105 120 110 - -

LPN 105 120 110 - -

HPN 105 120 110 - -

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