Experiment2

# Experiment2 - Department of Electrical Computer Engineering...

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- Department of Electrical & Computer Engineering - Course ECSE-291 EXPERIMENT 2 Cathode Ray Oscilloscope 2003-2004 -1- Objective: The cathode ray oscilloscope is an electronic measuring instrument which displays electrical signals in graphical form. It is one of the most widely used instruments, and knowledge to use it is essential in an electronic laboratory. The experiment will help you learn to use it for measuring voltages, time, frequency and phase. Preparation: The experiment consists of two main sections. The first section presents a systematic procedure to familiarize you with some of the important functions of an oscilloscope. In the second section you will use it to measure various signals and their parameters. In order that you will learn more in the available lab time, study the background information in the Appendices and then answer the following questions. 1. (a) What are the basic control parameters which must be set in order to trigger the sweep in an oscilloscope? (b) What are the functions of the input coupling switch? (c) Under what condition(s) is the differential input mode used? 2. A scope with x10 probe is used to measure v 1 (t) in the circuit of Fig. 1 when the input is a 1 kHz triangular wave with a peak-to-peak voltage of 8 volts. The vertical sensitivity and the time base are set at 0.1 V/div and 0.5 ms/div respectively. The settings of the trigger controls are: Mode = normal. Slope = positive. Level = 0.1 V. and source = internal. Sketch the expected display with the axes scaled in 1 div = 1 cm. 3. The output of the resistive adder shown in Fig. 2 is v o (t) = Av 1 (t) + Bv 2 (t) Find the constants A and B for the general case where the resistances are different and then the special case where they are equal.

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- Department of Electrical & Computer Engineering - Course ECSE-291 EXPERIMENT 2 Cathode Ray Oscilloscope 2003-2004 -2- Apparatus: Tektronix 2220 oscilloscope (or equivalent) 2 signal generators (Leader) DC Power Supply Experiment: Answer ALL questions during the laboratory period, but those marked with an asterisk (*) may be answered later. 1. Familiarization The following procedure has been designed to familiarize you with some important functions of the oscilloscope. Do NOT skip steps . To help you find the controls more easily, they are referenced with numbers in square brackets, as in a diagram in the abbreviated manual (which can be found in a folder on top of your analog scope) (a) Initial Operation: These operations are given on the inside cover of the abbreviated manual. They should enable you to obtain 2 horizontal traces on the screen quickly. If not, seek help from a teaching assistant. (b)
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Experiment2 - Department of Electrical Computer Engineering...

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