机电专业英语 教学课件 作者 杨寿智 刘水平 机电专业英语.Lesson 26.pptVIP

机电专业英语 教学课件 作者 杨寿智 刘水平 机电专业英语.Lesson 26.ppt

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Lesson 26 Oscilloscope Controls Text A wide variety of oscilloscopes(Fig.26.1) are available, ranging from relatively simple instruments with limited capabilities to much more sophisticated models that provide a variety of optional functions and precision measurements①. Regardless of their complexity, however, all scopes have certain operational features in common. In this section, we examine the most basic front panel controls. Each control and its basic function are described. Figure 26.2 shows a simplified representative front panel of an oscilloscope. Screen In the upper portion of Figure 26.2 is the CRT screen. There are 8 vertical divisions and 10 horizontal divisions indicated with grid lines or graticules. A standard screen size is 8 cm × 10 cm . The screen is coated with phosphor which emits light when struck by the electron beam. Power Switch and Light This switch turns the power to the scope on and off. The light indicates when the power is on. Intensity The intensity control knob varies the brightness of the trace on the screen. Caution should be used so that the intensity is not left too high for an extended period of time, especially when the beam forms a motionless dot on the screen②. Damage to the screen can result from excessive intensity. Focus This control focuses the beam so that it converges to a tiny point at the screen. An out-of-focus condition results in a fuzzy trace. Horizontal Position This control knob adjusts the neutral horizontal position of the beam. It is used to reposition horizontally a waveform display for more convenient viewing or measurement. Seconds/Division This selector switch sets the horizontal sweep rate. It is the time base control. The switch selects the time interval that is to be represented by each horizontal division in seconds, milliseconds, or microseconds. The setting in Figure 26.2 is at 10μs. Thus, each of the ten horizontal divisions represents 10μs, so there are 100μs from the extreme left of the scree

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