INDIVIDUAL SELECTION TYPE RELAY AMPLIFIER

摘要

PROBLEM TO BE SOLVED: To easily extend or revise number of channels, to quickly execute a temporary measure against on fault detection to avoid any trouble imposed on the user and to reduce the cost by configuring plural individual selection amplifiers with plural amplifier units mounting plural individual selection amplifiers so as to allow the user to detect a fault and to take a quick counter measure against on the occurrence of the fault. SOLUTION: An amplifier unit 20 is formed by arranging plural (m) units 20-1 to 20-m between a distributer 4 and a synthesizer 7. The number (m) is selected usually to be 1 to 8. Some number (n) (e.g. n=8) of individual selection amplifiers are arranged as one amplifier unit and in the case of extension, the amplifier units are added as the unit. Since the plural (n) sets of the individual selection amplifiers are assembled into one amplifier unit 20, there is possibility in excess of individual selection amplifiers not in use. Of course, an artifical excess way be permitted, excess individual selection amplifier are used positively as spare amplifiers.