Tan Delta often referred to as Dissipation factor or Power Factor, is an excellent diagnostic test that provides an as to the quality of the dielectric insulation used in electrical apparatus. By analysing the dielectric losses in the insulation, the TD series of test instruments provide the testing engineer with a versatile high voltage diagnostic system that is suitable for testing MV cable such as XLPE, EPR, PE and PILC plus a variety of other electrical apparatus such as capacitors, transformers and rotating machines.