The purpose of this Quick Guide is to provide guidelines on how to conduct basic technical measurements of hearing instruments using the HIT440 module for the Interacoustics Affinity 2.0 hearing aid analyzer.
Note: Hearing instruments needs to be in FULL ON GAIN MODE/TEST MODE in order to compare the results to the hearing aid manufacturers’ technical data sheets. Each hearing aid manufacturer has a different way of accessing this Test Mode. Please check with the hearing aid manufacturers for instructions on how to program the hearing aid into TEST MODE.
BTE hearing instrument
Positioning the BTE in the test chamber:
Place the coupler tube pointing straight forward and the microphone at the cross. (Multiple microphones: Place the half-way point between the microphones at the cross).
ITE/Open Fittings/Receiver in the ear
Positioning the ITE hearing instrument:
Place coupler at the back with hearing aid facing forward and the microphone at the cross. (For multiple microphones, rotate the hearing aid to get equal horizontal positioning of the mic inputs). Connect the ITE adaptor to the 2 cc coupler and attach the hearing aid using blue putty.
ITE pick-up coil test: For this particular test only: Position the coupler for maximum sensitivity of the coil.
Positioning the Open Fit/Receiver in the ear hearing instrument:
Connect the ITE adaptor to the 2 cc coupler. Remove the tip/dome from the hearing instrument and attach it to the ITE adaptor using the blue putty. Place the coupler tube pointing straight forward and the microphone at the cross.
Comparing to the manufacturers specification sheets
Most hearing aid manufacturers use known international standards, such as the ANSI or IEC for their specification sheets. The same standard can usually be selected in the HIT440 software.
Testing for battery drain
For more information on HIT440, please refer to the Affinity 2.0 Additional Information document.