An embodiment of a hearing assistance device comprises a housing, a power source, a radio circuit, an antenna and a transmission line. In one aspect, an article of manufacture is provided for polishing a substrate including polishing article comprising a body having at least a partially conductive surface adapted to polish the substrate and a mounting surface. The test wafer is cleaned in a cleaning operation. The major surface portion is free of simulated joints and extends over at least about 60% of the total surface of the facing surface. The analog to digital converter then converts the analog wobble signal to a first digital wobble signal.