Partial discharge is a localized breakdown of the insulation material of an electrical device. Partial discharge testing is of high importance on optic and magnetic isolators due to its capability of forecasting early defects on such devices. The ETS-88 UHV is designed to perform these types of tests at high voltage in compliance with IEC-60747. With an electric vehicle market demanding greater withstand for isolating parts, having components tested at higher voltages is a must. However, the test bench under which the high voltage is applied could become a source of PD (Partial Discharge) noise if the design is not performed carefully. Partial discharge tends to be a non-repeatable and unexpected behavior by the sole nature of the effect itself. This means high voltages require more reliable and robust designs that isolate the effect of the DUT (Device Under Test) from the rest of the hardware. Designing a low PD noise environment can be exhausting to debug. Hardware can confound the designer as the PD can’t be seen or measured directly with instrumentation on the DIB. This presentation will provide techniques such as PCB design, cable arrangement, clearance and creepage, material selection and structural support, which will be based on both theoretical and empirical knowledge.