巻号一覧
4 巻, 2 号
選択された号の論文の7件中1～7を表示しています
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森 礼於1965 年 4 巻 2 号 p. 75-82
発行日: 1965/02/10
公開日: 2009/11/26
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鈴木 晴之1965 年 4 巻 2 号 p. 83-92
発行日: 1965/02/10
公開日: 2009/11/26
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原 宏1965 年 4 巻 2 号 p. 93-102
発行日: 1965/02/10
公開日: 2009/11/26
ジャーナル フリーA large loop-gain for minimizing an offset error in a negative feedback (NF) system and its operation speed or an applicable frequency range of the system have been considered to be contradictory with each other, because of the stable operation of the system required.
A new principle to avoid the contradiction is proposed by the auther. It is a method to estimate the offset error through experiments with a simple combination of 2 or 3 finite loop-gain operations. In the new method (method of gain proportionality correction) the ratios of the loop-gains have to be known but the values of the loop-gains are unnecessary to be calibrated. As its result, (1) a large loop-gain is not necessarily required to minimize the offset error, and (2) unknown parameters included in the loop-gain can be ignored. This makes it easy to design and manufacture the operational amplifier, serving to extend the applicable frequency range or operation speed of NF system and thus brings about wider applicability of NF system in a variety of measurements.
This paper shows that the new principle is quite useful to eliminate the error of earth capacity in precise bridge measurement.抄録全体を表示PDF形式でダウンロード (1884K) -
大野 勇, 大河原 俊徳1965 年 4 巻 2 号 p. 103-114
発行日: 1965/02/10
公開日: 2009/11/26
ジャーナル フリーPhotoelectric chopper operates on the principle of modulating a light source which is used to illuminate photoconductive cells. That is, each of the two cells arranged in the chopper is illuminated alternatively by each half cycle of the light generated by a driving AC voltage. At the same time the cell changes its conductance into on-off action like a switch, so AC output voltage may be obtained in the load resistance connected to each cell. The chopper has such advantages as nonmechanical contact and low drift noise, and is nearly equal to mechanical chopper in many circuit applications. The chopper, however, has a restriction caused by the following limited factors. The first is an imperfect switching action. The cell conductance, even when brightly illuminated, never approaches infinity, while even when dark, never zero. Then, the ratio of light and dark conductances in the steady state may approaches 106. The second is a time lag of the cell conductance in response to a change in light level. These limited factors tend to restrict the modulating frequency, input and output impedances because conversion gain and phase lag of the chopper depend on these factors. The effect of these factors on conversion gain and on phase lag was theoretically analyzed and designing formula for the chopper was obtained. The formula was experimentally authorized. The authors developed photoelectric chopper driven by AC 115V (50c/s) for low level instrument. They have about 87% of conversion efficiency compared with mechanical chopper, 30 degree phase lag to driving voltage, 1μVrms drift noise and 250kΩ input impedance.抄録全体を表示PDF形式でダウンロード (2238K) -
曾我部 秀一, 橋本 礼治1965 年 4 巻 2 号 p. 115-124
発行日: 1965/02/10
公開日: 2009/11/26
ジャーナル フリーConventional point estimation does not guarantee the confidence of estimated value. In this paper, the authors first define a confidence factor (absolute confidence factor C (Δ), relative) confidence factor c (δ) as a measure of confidence, and then show an estimating method by which the (absolute or relative) confidence factor of estimated value is kept at a specified value γ. Especially, there is shown a decision rule (criterion) which determines a necessary and sufficient minimum sample size n. Although there are some cases where n is known before sampling, in many cases n cannot be found before samling, because the decision formula is the function of samle values. As an estimating method in the latter cases, the authors propose a new method called “sequential estimation”, in which, starting from a properly small size (initial sample size) nt, observers gradually increase the sample size n, checking at every sampling stage if the decision formula is going well, and stop sampling and estimate the parameter when the decision formula is first satisfied. Also shown is the method to decide the initial sample size nt.抄録全体を表示PDF形式でダウンロード (1353K) -
森 政弘1965 年 4 巻 2 号 p. 125-129
発行日: 1965/02/10
公開日: 2009/11/26
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1965 年 4 巻 2 号 p. 138
発行日: 1965/02/10
公開日: 2009/11/26
ジャーナル フリーPDF形式でダウンロード (153K)
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