6-30The horizontal sweep frequency of the scope should always be kept lower than, or equal to, thewaveform frequency; it should never be higher. If the sweep frequency were higher, only a portion of thewaveform would be presented on the screen.If, for example, three cycles of the waveform were to be displayed on the screen, the sweepfrequency would be set to one-third the frequency of the input signal. If the input frequency were 12,000hertz, the sweep frequency would be set at 4,000 hertz for a three-cycle scope presentation. For twocycles, the sweep frequency would be set at 6,000 hertz. If a single cycle were desired, the setting wouldbe the same as the input frequency, 12,000 hertz.DUAL-TRACE OPERATIONThe information presented in the previous sections served as a general overview of basic single-traceoscilloscope operation using one channel and operating controls. Now, you will be introduced to DUAL-TRACE operation.Dual-trace operation allows you to view two independent signal sources as a dual display on a singleCRT. This operation allows an accurate means of making amplitude, phase, time displacement, orfrequency comparisons and measurements between two signals.A dual-trace oscilloscope should not be confused with a dual-beam oscilloscope. Dual-beamoscilloscopes produce two separate electron beams on a single scope, which can be individually or jointlycontrolled. Dual-trace refers to a single beam in a CRT that is shared by two channels.Q-17.Scopes that produce two channels on a single CRT with a single beam are referred to as whattypes of scopes?Components Used to Select Vertical-Deflection Operating ModeThe VERT MODE controls (figure 6-34) allow you to select the operating mode of the scope forvertical deflection.
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