A system and method adaptively control sensitivity, on a pixel-by-pixel basis, of a digital imager. These and related services are provided in a transparent manner to a host mainframe by manipulating MVS format volume labels, volume tables of contents and indexes, catalog entries, data set names and similar mechanisms on mass storage devices connected to host mainframes using the MVS operating system. The supply current, also denoted test current, can be transient. A core output shaft is driven by another differential and a third shaft of each differential is connected to a variator. The rotation shaft member has a through hole that passes through the rotation shaft member in a first direction orthogonal to a rotation axis direction.