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They make no mention of using old-fashioned test equipment like a VTVM, a dummy load, or even a signal generator. I will now attempt Comparing tone pass along some of this acquired knowledge.
The oscilloscope is of course based on the cathode-ray tube, which displays the electrical signals in graphic form. It is probably the most widely-used test instrument because it can be used to observe waveforms as well as measure voltage, time, frequency, and phase angle.
Below is a simple drawing demonstrating a basic oscilloscope cathode-ray tube.
Oscilloscope CRT is a simple device in and of itself. There are opposing vertical and horizontal deflection plates inside the CRT, which is not evident in the drawing above.
The drawing below should make this a little clearer. Oscilloscope CRT has opposing pairs of deflection plates. The drawing below will Comparing tone that quite nicely.
If you are still following along, so far so good. We are almost done with the dry theory part. In normal oscilloscope operation, the beam is horizontally deflected from left to right across the screen at a certain rate. This sweeping action produces a horizontal line or trace across the screen.
The actual sweeping of the beam is accomplished by the application of a sawtooth voltage across the horizontal plates.
The rate at which the sawtooth goes from negative to positive is determined by its frequency. This in turn establishes the sweep rate of the beam. All oscilloscopes have provisions for selecting various sweep rates. A pictorial example of how a sawtooth voltage results in horizontal sweep is seen below.
Achieving horizontal sweep is not very difficult. Keep in mind that while a wide variety of oscilloscopes are available, all have certain operational features in common. How more advanced features may help us will be discussed later. This can make for more convenient viewing or measurement of a voltage.
This is also called the time base control, and selects the time interval that is to be represented by each horizontal division in seconds, milliseconds, or microseconds. This allows most waveforms, regardless of their voltage, to be displayed conveniently within the entire screen.
The AC coupling eliminates any DC component of the input signal. The Ground position allows for a zero-volt reference to be established on the screen.
This triggering of the beam causes it to begin its sweep across the screen.
It can be triggered from an internally generated signal derived from an input signal, or from an externally applied trigger signal. The modes of triggering are most often Auto, Normal, and TV. In the Auto mode, sweep will still occur in the absence of an adequate trigger signal.
In the Normal mode, a trigger signal must be present for the sweep to occur. The TV mode provides triggering of a frequency that is a harmonic of a Television sync signal.Gold Tone Mbass is a very popular option on the higher end of the price range.
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