natus Aurical HIT, User Manual, Page: 7 / 28

Coupler adapter
The Accessory Box provides a range of adapters for easy positioning of different types of hearing instruments.
Coupler cavity
During tests in the test chamber, the hearing instrument is connected to a 2cc coupler cavity manufactured in accordance
with the ANSI standard. Alternatively, you can use an ear simulator.
The ear simulator is not ANSI or IEC compliant, and is not recommended for RECD measurements.
You can use the Coupler Type (Coupler Type) icons in the toolbar to toggle between 2cc coupler
and ear simulator. The selected coupler type is saved with measurements for later reference.
Coupler microphone
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.
Aurical® HIT
A. BTE testing - Low coupler position
B. ITE, RIE, thin-tube testing - High coupler position
The Accessory Box
Connect the mini-jack cable from the Accessory Box to the mini-jack socket under Aurical® HIT, and insert the coupler
microphone in the microphone socket in the Accessory Box.
A. Wireless hearing instrument testing
Aurical HIT 7
4 The test chamber