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Example text

The following equation summarizes the measurement: Pulse Jitter = Jitter Width (Div) x Delay Time/Div. For the example shown in Fig. 2 mS. 32 mS Pulse Jitter Measurements Observing Video Signals Using Delayed Sweep (Refer to Fig. 44) (Refer to Figs. 45 through 49) 1. Apply the signal to one of the input jacks and set the oscilloscope to display the channel to be used. Use the Volts/Div control to adjust the waveform so that it is easy to observe. Special care should be taken to adjust the trigger controls for a stable display.

The section on "The NTSC Color Video Signal", at the end of this chapter, gives some basics for those who are unfamiliar with video signals or simply wish to refresh their memory. 3. Set the oscilloscope to display just the delayed sweep. Measure the width of the 37 1. Set up the oscilloscope for the alternate dual-trace display mode of the main sweep only and connect both the channel 1 and channel 2 probes to the same point in the circuit (if you wish, a "T" connector can be used at the channel 1 input jack to feed the same signal to each channel).

On a conventional oscilloscope, slow events, even though they may be repetitive, pose a particular problem when timing measurements are required. This is because the waveform is often only a dot moving slowly across the screen, rather than a line. Conventional scopes use a short-persistence phosphor, that is, one that fades very quickly after the electron beam ceases or moves. Because of this, it is much more difficult to make graticule measurements on a moving dot than on a complete trace. Moreover, if the time base is increased to change the dot to a line, then this line is usually moving up and down in its entirety.

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B&K Oscilloscope Applications Guide Book


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