Apparatus and method, as may be used to acquire different components of solar irradiance in a solar-based power generation system or as may be used in a sky imager, are provided. The conductors comprise a set of electrically conductive contact areas on different conductors which define a contact plane with the conductors extending below the contact plane. The locking mechanism may be disengaged through use of a release mechanism. , by supplying the lowered internal power voltage to the core circuit unit, the reliability of the cell and noise characteristic is improved. A Ro-handle 3 is arranged not on the upper surface side but on the lower surface side of the Ro-arm 1.