雑音をともなう低周波微小電圧の検出 : S/Nを最良にする入力変成器の変成比の決定

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  • Detection of A.F. weak signal accompanied with thermal noise : decision of ratio of input transformer
  • ザツオン オ トモナウ テイシュウハ ビショウ デンアツ ノ ケンシュツ S N オ サイリョウ ニ スル ニュウリョク ヘンセイキ ノ ヘンセイヒ ノ ケッテイ

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抄録

On detection of A.F. low-level signal, level of minimum detectable signal are related to a ratio of input transformer of the amplifier of measuring systems. W.A. Rinehart and L. Mourlam, Jr. already discussed the case in which amplifier had lower input impedance (1~50 megohms). The theory, however, is not applied to the amplifier with higher input impedance (higher than 50 megohms). The paper gives clues of design of the input transformer of the measuring systems and shows that an exciting inductance L of the input transformer and a resistance of the signal source play the leading role on the decision of the input transformer.

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