| 摘要 |
PURPOSE:To obtain an optional impedance by connecting plural impedance elements in series and containing the connected elements in a casing and connecting a mutual connecting point of each element to an exposed connecting terminal. CONSTITUTION:Resistors R1-Rn are connected in series between connection terminals (a, b). The resistance value of he resistors R1-Rn is a power of a predetermined value. A network resistor 30 comprising the series circuit of the resistors R1-Rn is contained in the casing 20. Then the mutual connection points Q1-Qn of the resistors R1-Rn are connected to resistor selection terminals Vs1-Vsn exposed externally. Thus, a desired impedance is obtained by short-circuiting selectively the selection terminals Vs1-Vsn.
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