EM7_Manual - General Physics II Lab EM7 Introduction to the...

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General Physics II Lab EM7 Introduction to the Oscilloscope General Physics II Lab EM7 Introduction to the Oscilloscope Purpose In this experiment, you will learn how to use the oscilloscope and function generator. Equipment and components Tektronix TDS 2002B oscilloscope and Topward 8120 function generator. Background The oscilloscope The oscilloscope (scope in short) is one of the most used test and measurement tools in laboratory. Most modern oscilloscopes are capable of measuring both DC and AC signals over a wide range of frequencies and you should check your oscilloscope for its frequency response. The “analog” oscilloscope is equipped with a vertical control for displaying the input signal and with a horizontal control for displaying a periodic signal that linearly increases with time and very quickly drops back to zero. The period of the sawtooth signal is adjustable and may be synchronized with the vertical input. With both the vertical and horizontal controls, one can display the input waveform as a function of time. The horizontal input of the oscilloscope may also be used to operate the scope in the “x-y” mode (Please refer to Appendix 1 for details). While analog devices make use of continually varying voltages, digital devices employ binary numbers which correspond to samples of the voltage. In the case of digital oscilloscopes (that we use in our experiment), an analog-to-digital converter (ADC) is used to change the measured voltages into digital information. Waveforms are taken as a series of samples. The samples are stored, accumulating until enough are taken in order to describe the waveform, which are then reassembled for display. Digital technology allows the information to be displayed with brightness, clarity, and stability. There are, however, limitations as with the performance of any oscilloscope. The highest frequency at which the oscilloscope can operate is determined by the analog bandwidth of the front-end components of the instrument and the sampling rate. The function generator This device produces sine, square, and triangle waves plus a few others that you will not need for this experiment. The frequency range varies from less than 1 Hz to many MHz. You will use this generator to provide an AC signal to the oscilloscope. In this way you will be able to study different waveforms and to get an understanding of some basic AC signals. There are several function generators available in the laboratory. Some of them have a synchronous pulse or square wave output useful for triggering purpose (Please refer to Appendix 1 for the working principle of triggering) and a voltage-controlled oscillator (VCO), which allows one to vary the output frequency of the function generator by applying a controlled-voltage. Procedure
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This note was uploaded on 03/31/2011 for the course PHYS 1 taught by Professor Nianlin during the Spring '11 term at HKUST.

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EM7_Manual - General Physics II Lab EM7 Introduction to the...

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