A Method of Obtaining the Braun Tube Figures in Rectangular Co-ordinate

Abstract

In order to obtain the Braun Tube figure in a rectangular co-ordinate, it is necessary to use the saw-teeth shaped voltage wave as the time axis, that is to say, the instantaneous value of the time-axis voltage should vary holding the exact linear relation with the time during the complete period.
The writers tried to employ the secondary induced voltage of a small transformer which is excited by the full wave rectified current obtained by two kenotrons. This secondary voltage was applied between one pair of electrode plates in a Braun Tube and the voltage under test between another pair of plates, and when the fundamental frequency of the latter was an even multiple of that of the time-axis voltage, stationary figures were obtained in a rectangular co ordinate.
Ideal teme-axis voltage can be obtained when the primary rectified cur-ent has the, parabolic wave form and the transformer has the ideal characteristics, but these conditions are not satisfied exactly in actual case. For practical purpose, the wave form can be seen without appreciable error, taking a portion. of the steady figure which is superposed on the linear part of the time-axis voltage.
In the present paper, influences of the circuit constants upon the wave form of the secondary induced saw-teeth shaped voltage were first investigated by ordinary Braun Tube figures, (from Fig. P-1 to Fig. P-16) and then thewave forms of Microphone Hammer, Multi-vibrateur and the damped oscillation in a triode circuit were observed by our method in a rectangu ar co-ordinates (Fig. 8. Fig. 9 and Fig. 17-a & b ).
This paper contains the following items:-
(1) Introduction
(2) General consideration
(3) Experimental results