This NORDTEST method applies to hearing aids having automatic gain control (AGC) or similar adaptive circuitry. The method uses broad band noise to give reproducible characteristics of the electroacoustical properties of a hearing aid.
Nordtest is a trademark of Nordic cooperation in conformity assessment. The emphasis of Nordtest is to develop, promote and innovate Nordic test methods and pre-normative activity. Nordtest endeavours to remove technical barriers to trade and promotes the concept: “Approved once, accepted everywhere”.