The offline Partial Discharge Analyzer is a comprehensive tool for assessing dielectric in Power Transformers, Generators, Motors, Current Transformers-Potential Transformers. By way of periodical monitoring of partial discharge occurring within the insulation structure, the operational reliability of the insulation in critical apparatus can be established. Such assessment helps provide valuable information for the pre-fault condition of the apparatus which could be very critical in power infrastructure and forecast the maintenance and repair schedules or in many cases PD assessment can help avoid or postpone the inspection and maintenance plans to prioritize the operational availability of the assets.