Transformer windings which is related to the starting winding This

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winding shunts one half of the primary winding in all full wave, synchronous and non-synchronous vibrator systems.

The oscillograms we shall show will serve to illustrate how the cathode-ray oscillograph can be used to establish the effect of various adjustments, showing that various changes in adjustment and circuit constants influence the voltage waveform and proper interpretation should lead to most efficient servicing.

The schematic wiring diagram of the full-wave non-synchronous vibrator power supply units used during some of these tests is shown in figure 353. The various designations related to the transformer

Non Synchronous Vibrator

t Linear. sweep

Fig. 353. Schematic diagram of a full-wave non-synchronous vibrator power supply unit.

t Linear. sweep

Fig. 353. Schematic diagram of a full-wave non-synchronous vibrator power supply unit.

winding represent the points to which the vertical deflection plates of the cathode-ray oscillograph were joined. The cathode-ray unit was arranged for use as a means of observing voltage waveform. The linear sweep oscillator within the unit was joined to the horizontal deflection plates in order to supply the horizontal time displacement.

Figs. 354, 355, 356, 357. Oscillograms of the voltage taken across PI and P2 and the center tap are shown in Figs. 354 and 355. Similar oscillograms taken across SI and S2 and the center tap are shown in Figs. 356 and 357. See Fig. 353 for points of test.

Internal synchronization was employed. Vibrator adjustments were checked by noting the voltage waveform across the various terminals specified in the text and shown upon the diagram. The "high" terminal of the vertical deflection plates was connected to the point designated. The "low" or grounded terminal of the vertical deflection plates was connected to the associated center tap upon the identified winding or across whatever points may be specifically stated.

The waveform for the vibrator as received, when checked between P-l and the center tap and between P-2 and the center tap, is shown in

Fig. 358. Oscillogram of voltage taken across terminals

figures 354 and 355 respectively. The corresponding voltage waveforms, as checked across the secondary winding between S-l and the center tap and between" S-2 and the center tap, are shown in figures

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