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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 Detection of A.F. weak signal accompanied with thermal noise : decision of ratio of input transformer 武石, 泰亮 TAKEISHI, Taisuke open access 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. 鹿児島大学 Kagoshima University 1968-09 jpn departmental bulletin paper VoR http://hdl.handle.net/10232/11140 https://ir.kagoshima-u.ac.jp/records/7606 0451212X AN00040363 鹿児島大学工学部研究報告 The research reports of the Faculty of Engineering, Kagoshima University 10 23 27 https://ir.kagoshima-u.ac.jp/record/7606/files/AN00040363_v10_p23-27.pdf application/pdf 1.7 MB 2016-10-28 1968-09