| 摘要 |
PURPOSE:To make an apparatus equipped with two input terminals only usable as an apparatus equipped with tow series of input terminals and, at the same time, for bridge connection as well, by switching the on/off of a terminating resistance and the connection of an amplifier by using two pieces of input terminals, each of which is composed of two terminals, and a switch which is composed of the combination of one-circuit and three-contacts and three- circuits and one-contact. CONSTITUTION:An input terminal C is composed of two terminals (g) and (h) and another input terminal D is composed of two terminal (i) and (j). A change over switch has a switch constituted of two sets of 1-circuit 3-contact switches or a 3-circuit 1-contact switch and 1-circuit 3-contact switch at its inside. For example, a signal from the terminal (g) of the input terminal C is connected with the terminal (c) through the movable sliding terminal (a) of a switch E1 and, thereafter, with an amplifier II, At this time, the terminal (e) of the switch E1 and terminals (i) and (j) of another switch E2, which are connected with the terminal (i) of the input terminal D are disconnected. Therefore, the input terminal C can be used as an input terminal while an output signal terminal from an external apparatus is connected with the input terminal D.
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