All issues
Successor
- IEEJ Transactions on Sensors and Micromachines
- IEEJ Transactions on Industry Applications
- IEEJ Transactions on Electronics, Information and Systems
- IEEJ Transactions on Power and Energy
- IEEJ Transactions on Fundamentals and Materials
- The Journal of The Institute of Electrical Engineers of Japan
- The transactions of the Institute of Electrical Engineers of Japan.C
- The transactions of the Institute of Electrical Engineers of Japan.B
- The transactions of the Institute of Electrical Engineers of Japan.A
Volume 45, Issue 441
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
H. YAGI, I. WATANABE1925 Volume 45 Issue 441 Pages 305-310
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe wave shape of current flowing through a tungar rectifier is observed by Braun tube oscillograph when the rectifier is performing-
1. Half wave rectification,
2. Full wave rectification,
3. Half wave rectification against counter E. M. F.
4. Full wave rectification against counter E. M. F.
The dynamic characteristic of the tungar bulb is then examined. It is found that, when the load current is considerably large, the rectification may go on even if the filament current is cut off.
The performance of the rectifier shows little alternation for the frequencies varying between 30 and 70 cycles per second.View full abstractDownload PDF (202K) -
MATSUJIRO ÔYAMA1925 Volume 45 Issue 441 Pages 311-317
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSFor laboratory standard of thermal radiation, a simplified form of Lummer and Kurlbaum type was designed and constructed. (Fig. 6) And Sufficiently good result was obtained. Several notes for operation are added.View full abstractDownload PDF (743K) -
H. YAGI, T. KAMIYA1925 Volume 45 Issue 441 Pages 318-338
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSA differential equation of the second order is found to determine the motion of the disc of an in luction type protective relay.
By solving this fundamental equation of motion, the following factors are theoretically cons dered in Part I.
1. Angular displacement of the disc.
2. Angular velocity of the disc.
3. Contact making time.
4. Starting current.
5. Returning of the disc.
The motion of the Type CO over load relay of the Westinghouse Electric and Mfg. Co. is experimentally studied in Part II, and, from the test results of the above mentioned factors, it is tried to reduce the physical constants of the relay.View full abstractDownload PDF (811K) -
YASUSI WATANABE1925 Volume 45 Issue 441 Pages 339-347
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSWhen the grid voltage of a triode valve oscillator is gradually increased from an extremely low value, an oscillation is suddenly brought to existence at certain point, accon panying considerable increase of both the average plate current and the average grid current. The +further increase of the grid voltage causes the further increase of both of the currents, whereas the intensity of oscillation shows a slight decrease after having a maximum point. At certain positively high gride voltage, the oscillation stops abruptly, and the plate current suddenly attains a large value corresponding to a point on the static characteristic curve, and the grid current shows a sudden decrease.
It is to he noted here that, when the grid voltage is relatively high, the average plate current in the oscillating condition is considerably smaller than that in the non-oscillatory state.
Now suppose that the plate voltage is made slowly pulsating by some means and the grid voltage is kept relatively high with respect to the plate voltage, then it can be understood that the high frequency oscillation can exist only for the interval of time when the plate voltage is kept sufficiently high, and the production, of this oscillation consequently reduces the average plate current. It may be said in regard of only the low frequency pulsation, that the electronic conduction within the valve acquires. a falling characteristic on account of the budding up of oscillation, so that a low frequency oscillation is excited, resulting in the consequent production of the intermittent oscillation.
Such an anomalous phenomenon can be easily observed in the usual valve oscillator circuit, as shown in Fig. 1 and Fig. 8, in which the low frequency circuit comphses the choking coil of L, Henries and the by-path condenser of C0 Farads, and the frequency of the plate voltage pulsation or the frequency of the intermission of high frequency oscillation may be given by f0=1/2π√L0C0 cycles per second.
In the present report, the writer describes the results of the experimental determination of the possible range of this anomalous phenomenon with respect to the plate voltage, the grid voltage, the filament current, the constants of the oscillation circuit, the coupling between the grid and the plate circuits, and the resistance inserted in series with the choking coil.
Such a resistance serves to stop the "noise" as produced in the oscillator system on account of this intermittent oscillation.
It is also experimentally ascertaind that when iron-core is used in the choking coil, the value of L0 varies with the average value of the pulsating current flowing through it. Some oscillograms are shown.View full abstractDownload PDF (512K) -
T. TERAMURA1925 Volume 45 Issue 441 Pages 348-369
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (2395K) -
S. CHIBA1925 Volume 45 Issue 441 Pages 370-377
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe paper describes the general consideration on the design of intervalve transformers which enable the distortionless amplification over a given audible frequency range.
It is shown that the necessary conditions to be satisfied by such transformer are:-
(i) It must be coupled with a triode valve whose plate resistance is as low as possible,
(ii) The ratio of transformation should not be high,
(iii) The distributed capacity of the transformer shoud be minimized,
(iv) The number of terns of the primary winding of the transformer must be large enough so that its na ural frequency may remain as low as possible.
It is tharefore difficult to construct a transformer amplifier which gives the voltage ampl fication high eaongh with minimum of frequency distortion over a wide range of frequency. In practice these requirements are approximately satisfied by combining the transformer of a siutable ratio of transformation with the valve whose constants have some suitable values.
A simple method of testing the frequency characteristic of the intervalve transformer is given. The method is applicable if the transformer has no leakage flux. If the transformer is shunted on the primary side by a noninductive resistance whose value is equal to the plate resistance of the value to be coupled the impedance measured on the same side of transformer by an impedance bridge for a certain frequency range gives at once the measure of the variation of the voltage amplification over a given frequency range. The secondary winding must in the case be connected to the grid circuit of the value of the next-stage with siutable grid bias.
The theory given by many authors of intervalve transformers show that the optimum ratio of transformaion is approximately equal to the square root of the ratio of the grid impedance to the plate resistance. The maximum voltage amplification per stage is then equal to half the product of the ratio of transformation into the amplification factor of the triode. It is indicated that this theory is not siutable to explain the high voltage amplification measured very often in actual tests. The equation derived in the paper show that the voltage amplification per stage is just twice the value (maximum) derived by the old theory. The latter is erroneous since it does not take into account the variation of the secondary impedance with the ratio of transformation. This variation is not negligib'e when the grid circuit impedance is enhanced by the appropriate grid bias. The secondary impedance then consists mainly of the distributed capacity of the transformer winding.View full abstractDownload PDF (516K) -
R. NAKAMURA1925 Volume 45 Issue 441 Pages 378-382
Published: 1925
Released on J-STAGE: May 20, 2013
JOURNAL FREE ACCESSDownload PDF (973K)
- |<
- <
- 1
- >
- >|