ETS-Lindgren HI-3604, User Manual

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Figure 4-5: Waveform of Incandescent Light Bulb Operated by a
Light Dimmer
Figure 4-6: Waveform of Light Dimmer Current
Figure 4-7 illustrates yet another application of the HI- 3604 in the measurement
of the magnetic field waveform caused by the vertical deflection circuits in a
typical video display terminal (VDT). The images displayed on the screen of a
VDT consist of many horizontal sweeps of an electron beam across the screen to
trace out the intended image; when the electron beam reaches the bottom of the
screen, it is returned rapidly to the top of the screen from where it again repeats