Lab2_2010 - ECE212H1F University of Toronto 2010 EXPERIMENT...

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Exp. 2 - 1 ECE212H1F University of Toronto 2010 EXPERIMENT #2 DC CIRCUITS AND SIGNAL TRANSFER ECE212H1F OBJECTIVES: To review measurements of DC voltage, DC current, and resistance, using a digital multimeter, DMM. To study conditions necessary for an optimal signal transfer, specifically conditions for the optimal voltage transfer, optimal current transfer, and optimal power transfer, for various ratios of source and load resistance. To design and test a thermistor-based temperature sensor. GENERAL COMMENTS: Review methods of DC voltage measurement, DC current measurement and resistance measurement using a digital multimeter, DMM. Reference : ECE110 Laboratory Equipment Instruction Manual Recall that a signal has to be adjusted to a required value before it is connected to a protoboard. Wherever applicable, indicate values of internal resistances and ranges of the equipment used in the measurement. Results computed in the preparation assignment of each part of the experiment serve as a prerequisite for the experimental part. Transfer all computed data in tables and graphs to your lab-book. All plots must be pasted or stapled into the lab book. Marks will be deducted for failing to comply, and for missing or poor documentation. TABLE OF CONTENTS: Page REQUIRED READING Exp. 2 - 2 IINTRODUCTION (A) DC CIRCUITS Exp. 2 - 2 (B) THERMISTOR Exp. 2 - 4 EQUIPMENT Exp. 2 - 4 EXPERIMENT 2.1.1 Thevenin and Norton Equivalent Circuits Exp. 2 - 6 2.1.2 Signal Transfer Exp. 2 - 7 2.2 Temperature Sensor Exp. 2 - 12
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Exp. 2 - 2 REQUIRED READING: J. David Irwin and R. Mark Nelms, Basic Engineering Circuit Analysis , 9 th ed., Wiley, ISBN 978-0-470- 12869-5, 2008: Ch. 2: pp 24-57; Ch. 5: pp 191-208. INTRODUCTION: (A) DC CIRCUITS The purpose of this experiment is to study signal transfer in electric circuits. When two electric devices are interconnected, for example when the output of a sensor (source) is applied to the input of an amplifier (load), an information-carrying signal (either voltage or current) supplied by the source might be affected. V s R os + - V IA R IA Voltage Source Amplifier (Load) Fig. 1 If the information-carrying signal is a voltage as in Fig. 1, ideally the source voltage should appear across the input terminals of the amplifier, i.e. V s = V IA with R OS =0. Similarly, if the information–carrying signal is a current, as in Fig. 2, ideally all current supplied by the current source should flow into the input of the amplifier, i.e. ideally I S = I IA with R OS = . R R IA Current Source Amplifier (Load) I s I Fig. 2
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Exp. 2 - 3 For a non-ideal source, i.e. for a finite R OS for either a voltage source or a current source, a fraction of the power is dissipated inside the source. If a transfer of power is of interest, this fraction should be as small as possible. Since practical devices have finite values of input and output resistances, ideal conditions of signal transfer are never met. There will always be an error, i.e. a loss of information, or power, however small, whenever a signal is transferred form one stage to another.
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This note was uploaded on 10/17/2010 for the course DA da taught by Professor Da during the Spring '10 term at University of St Andrews.

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Lab2_2010 - ECE212H1F University of Toronto 2010 EXPERIMENT...

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