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There are certain products which ask for Isolation requirement to be met. To meet this requirement, we usually make use of Isolated DC - DC converter which is an easy & compact solution. Usually this leads to severe electromagnetic interference issues which badly impact the Certification/Qualification of the product. This is due to the in-built transformer in the Isolated DC - DC converter device, which switches at high frequency, in the range of mega hertz. Considerable amount of time and money is spent in debugging and resolving these issues. This paper is intended to address these issues with solutions, which will help the designer to take care at the Design stage, thereby saving time & money, the important parameters of the project cost. A set of experiments & analysis were conducted to find the root-cause of the issue.