Radiotomography nominal frequency selector - for sharply defined nominal frequency curve and voltage generated free from drift phenomena

摘要

The nominal frequency selector selectively produces specific output functions controlling the parts of the apparatus to be moved in two or three vertically opposing directions. The selector comprises a regulator to control both counters for the timing impulses generated by an impulser as well as a set value register which provides a specific binary output signal for each input signal. A digital analog transformer is also provided as is a multiplex synchronized by the impulser and alternately coupling the counter outputs with the set value register input and the set value register output to the digital analog transformer input. The polarity of the digital analog transformer output signals can be controlled by the regulator.