The A-53-Gerber is a single-sided test board having six SIR test patterns which were designed for surface insulation testing. The test patterns consist of two comb patterns with 500µm (0.0197”) lines/spaces, two comb patterns with 318µm (0.0125”) lines/spaces and two comb patterns with 200µm (0.0079) lines/spaces. The contact fingers of the board are normally gold plated for compatibility with...