Abstract
The main features of the Bruel and Kjaer Audio Test Station are briefly outlined. A description is given of minor problems experienced in using the equipment for testing hearing aids, together with modifications prompted by users. A modification to the internal memory circuitry is described, which enables test enclosure amplitude correction data to be retained while the test station is switched off. This removes the need to perform a time-consuming daily routine which could result in accidental expensive damage to the measuring microphone and coupler assembly. A simple means is given for rapidly checking the operation of the tester and the integrity of the correction data.