A variable attenuator constructed by combining resistive elements. It is used to adjust the signal level and as a standard for attenuation when measuring the gain, loss, and distortion rate of communication lines, amplifiers, filters, etc. There are also fixed resistive attenuators called pads. Attenuator circuit types include T-type circuits and π-type circuits, and all elements are composed of non-inductive resistors so that uniform attenuation can be provided over a wide frequency range. The characteristics of a resistive attenuator are specified by two characteristic values: the attenuation amount and the nominal impedance, which is necessary to achieve impedance matching with the connected circuit. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
抵抗素子を組み合わせて構成した可変の減衰器のこと。通信回線や増幅器,フィルターなどの利得,損失およびひずみ率などを測定する際に,信号レベルの調整や減衰量の標準として用いられる。このほかに,パッドと呼ばれる固定の抵抗減衰器もある。減衰器の回路形式としては,T形回路,π形回路などが用いられ,広い周波数範囲にわたって一様な減衰を与えることができるように素子はすべて無誘導抵抗器で構成される。抵抗減衰器の特性は減衰量のほかに,接続する回路とのインピーダンス整合を図るうえで必要な公称インピーダンスの二つの特性値によって規定される。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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