1.Product Introduction

Hearing aids（Hearing Aid）It is an electroacoustic amplifier that amplifies sound to enable individuals with poor hearing to hear sounds that were previously unclear or inaudible. A hearing aid generally consists of six parts: microphone, amplifier, headphones, earplugs, volume control switch, and battery. Among them, the microphone (also known as a microphone or microphone) receives sound and converts it into electrical signals, that is, converts sound energy into electrical energy; Amplifier amplifies electrical signals (transistor amplification circuit); Headphones convert electrical signals into sound signals, that is, converting electrical energy into sound energy; Earplugs (also known as ear molds) deliver headphone sound into the external auditory canal; Volume control switch, controlling the amplification factor of sound; Battery provides power for hearing aids.

In the process of designing and producing hearing aids, there is a need for a measuring instrument that can quickly and accurately detect the electroacoustic characteristics of the hearing aid.

2.Basic performance indicators for work

（1）Test microphone:AWA14422Type pressure field microphone

（2）Acoustic coupler:AWA6161AType acoustic coupler (compliant withIEC 60318-5Standard) orAWA6162Type ear simulator (compliant withIEC 60318-4Standard)

（3）Test sound source(Installed in the testing box)Frequency range:100 Hz～10 kHzOutput sound pressure level:50 dB、60 dBand90 dB

（4）Test box:AH8582Type test box orAH8583Type test box, average sound insulation: not less than30 dB(Greater than)100 HzWhen)

（5）Signal input: Frequency range:20 Hz～20 kHzRange of amplitude:50 dB～130 dB(Reference sensitivity of microphone)-26 dBV/Pa）

（6）Signal output: Frequency range:20 Hz～20 kHzRange of amplitude:10 mV～10 V(RMS)

（7）Sweep frequency method: linear, measurement frequency range:200 Hz～20 kHzFrequency interval:100 Hz

（8）Local noise:< -75 dBV（ZAccounting rights)

（9）Measurement triggering method: mouse, keyboard, or foot switch

（10）Working power supply:220 V/50 HzExchange of mains electricity

（11）Working conditions: Environmental temperature:0 ℃～40 ℃ Relative humidity:20 %～90 %Atmospheric pressure:86 kPa～106 kPa

（12）Host size:440 mm×325 mm×151 mm（W×D×H）

（13）Host weight:8 kg

3.System testing principle

In the test box, first calibrate the test sound source to output a specified sound pressure level at each frequency within a frequency range. The hearing aid microphone receives the sound emitted by the test sound source, and the internal circuit of the hearing aid amplifies the sound of the microphone to drive the hearing aid headphones to produce sound. Measure the sound emitted by the hearing aid headphones using the test microphone inside the sound coupler, in order to obtain various electroacoustic indicators of the hearing aid.

4.Parameter Settings-Microphone calibration

Click on the menu bar-Settings-Microphone calibration, the software pops up the following window.

Remove the microphone from the acoustic coupler, insert the microphone into the sound level calibrator, press the calibrator switch, and the calibrator will emit 1 kHz，94 dB（1Pa）The voice. Click the microphone calibration button, and the software will automatically pop up a button after two seconds. If the microphone is not calibrated or damaged, the sensitivity of the microphone during calibration will be less than-50 dBV/Pa,At this point, the software pops up a window for abnormal microphone sensitivity, and does not save the microphone calibration results. Press the shortcut keyCtrl+Shift+F2Activate the input box and manually fill in the sensitivity value. After calibration, install the microphone into the echo coupler.

5.test process-testing procedure

Place the hearing aid inside the testing box, and place the microphone of the hearing aid at the red dot inside the testing box.

OSPL90Indicate full gain90dB、FOG50Indicates full gain frequency responseReference Test GainIndicate the gain reference positionResponse LimitRepresenting bandwidthTotal Harmonic DistortIndicating total harmonic distortion andEQ Input NoiseRepresents equivalent input noise.

Select manual mode or automatic mode in the parameter settings, and click the start button (shortcut key) Enter）Conduct testing.

Press the shortcut key F6Switching testing standards,ANSI 3.22standardFOG50The curve is not displayed,FOG50 maxThe value is unpredictable.

Export Report

Click on the menu bar-data-Export report, software pops upWordA formatted data report.

Software exit

Click on the close icon in the upper right corner of the software interface.

6161（HA-1）2-cccoupler

Size meets ANSI S3.7Used for testing in ear hearing aids, in ear canal hearing aids, and ear molds for installed hearing aids. andAWA6128AHHearing aid tester andAWA8583The soundproof box is used in conjunction with it.HA-1Direct contact coupler used for testing in ear（ITE）Within the ear canal（ITC）Completely within the ear canal（CIC）And other hearing aids with ear molds. In some cases, it can also be used to test open ear hearing aids.

6161（HA-2）2-cccoupler

Size meets ANSI S3.7Used for testing the back of hearing aids, goggles, and body hearing aids. andAWA6128AHHearing aid tester andAWA8583The soundproof box is used in conjunction with it.HA-2The coupler is similar to the human ear, with an ear module. The button type receiver is directly connected to this coupler. Behind the ear（BTE）The hearing aid is connected to this coupler through an ear plane adapter.

6161（CIC）Coupler

CICThe coupler complies with《IEC-TS 62886-2016》Standard, with0.4 ccNon standard couplers of couplers (andHA-1The coupler is used2 ccDifferent sizes). andAWA6128AHHearing aid tester andAWA8583The soundproof box is used in conjunction with it. This coupler is used to generate a frequency response similar to the actual response found in the patient's ear. When actual ear measurement is impossible or impractical, it is recommended to use this coupler to obtainCICThe true frequency response of hearing aids.

AWA6128AHThe type hearing aid tester mainly measures the electroacoustic characteristics of hearing aids.

AWA6128AHType hearing aid tester execution《IEC 60118-7 2005》The 《ANSI 3.22-2009》The 《ANSI 3.22-2014》The 《GB/T 25102.100-2010Electroacoustic hearing aids0 Part: Measurement of Electroacoustic Characteristics 《GB/ T 25102.7-2017Electroacoustic hearing aids7 Part: Measurement of Performance Characteristics for Quality Assurance in the Production, Supply, and Delivery of Hearing Aids《JJF1201-2008Standards such as the Calibration Specification for Hearing Aid Testers. The instrument mainly consists of a testing host, a testing box, a sound source, a testing microphone, and an ear simulator. Can measure the full range gain of hearing aids90 dBAcoustic indicators such as full range gain frequency response, gain reference position, bandwidth, total harmonic distortion, equivalent input noise inductance, and inductance. Instrument features: The software includes automatic testing mode and manual testing mode, and unqualified items are automatically displayed“X”And one click export of measurement reports, etc.