EE 230 Lecture 4 Spring 2010

# EE 230 Lecture 4 Spring 2010 - EE 230 Lecture 4 Background...

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EE 230 Lecture 4 Background Materials Transfer Functions Test Equipment in the Laboratory

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Quiz 3 If the input to a system is a sinusoid at 1KHz and if the output is given by the following expression, what is the THD? 2sin(2000 ) 0.1sin(4000 45 ) 0.05sin(10000 120 ) oo OUT Vt t t ππ π =+ + + +
And the number is ? 1 3 8 4 6 7 5 2 9 ?

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Quiz 3 If the input to a system is a sinusoid at 1KHz and if the output is given by the following expression, what is the THD in % (based upon power)? 2sin(2000 ) 0.1sin(4000 45 ) 0.05sin(10000 120 ) oo OUT Vt t t ππ π =+ + + + 2 2 100% k = 2 k 1 A THD = A 22 2 0.1 .05 100% 0.31% + ± THD = 2
Test Equipment in the EE 230 Laboratory (Plus computer, oven, software)

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Whats inside/on this equipment? Computer (except maybe dc power supply) Some analog circuitry Software Knobs/Buttons Computer Interface Test equipment is becoming very powerful Seldom need most of the capabilities of the equipment Versatility and flexibility makes basic (and most used) operation a little more difficult to learn

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168 Pages

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When is the voltage reading on the Signal Generator Accurate? Almost Never ! When it is reasonably close, (i.e. when not affected by the effects of the output impedance on the actual output) how does the accuracy compare with that of the scope or the digital multimeter measuring the same voltage? Two to three orders of magnitude worse !

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Test Equipment in the EE 230 Laboratory 984 Pages ! The documentation for the operation of this equipment is extensive Critical that user always know what equipment is doing Consult the users manuals and specifications whenever unsure
Whats inside/on this equipment? Computer (except maybe dc power supply) Some analog circuitry Software Knobs/Buttons Computer Interface Why is this not the standard interface with a computer?

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Properties of Linear Networks ( ) () OUT IN Xs = T(s) T(s) ( ) P s=j Ts = T( j ω ) ω is termed the transfer function Will discuss the frequency domain representations and the more general concept of transfer functions in more detail later This is often termed the “s-domain” or “Laplace-domain” representation frequency domain Review from Last Time
Distortion A system has Harmonic Distortion (often just termed “Distortion”) if when a pure sinusoidal input is applied, the Fourier Series representation of the output contains one or more terms at frequencies different than the input frequency A linear system has Frequency Distortion if for any two sinusoidal inputs of magnitude X 1 and X 2 , the ratio of the corresponding sinusoidal outputs is not equal to X 1 /X 2 .

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## This note was uploaded on 02/01/2012 for the course EE 230 taught by Professor Mina during the Fall '08 term at Iowa State.

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EE 230 Lecture 4 Spring 2010 - EE 230 Lecture 4 Background...

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