Sphere Gaps measurement is one of the standard method used of measuring peak value of the high voltage either DC, AC and impulse voltage. Sphere Gaps arrangement is provided in two ways. One is Horizontal and other is vertical. Horizontal arrangement is preferred is suitable for low voltage range. In both the arrangements one of the sphere is static and other is movable (adjustable). In vertical arrangements lower sphere is grounded and in Horizontal arrangements both spheres connected to the source voltage or one sphere grounded. Series resistances are provided in between source and sphere to limit the breakdown current and to suppress unwanted oscillations.