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Lecture #3

DC and AC measurements

EE 211

Spring, 2005

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Best titles from riting Assignment

1! "easured alue and tolerance conformit$ of 2%0

o&m resistors

! "easured resistance of ten 1'0 o&m resistors, andt&e mean and standard deiation of t&e sample(

! "easurements and statistics for 10 '(2)o&m 10*

tolerance resistors

! A sample of 10 resistors and t&e corresponding

statistical anal$sis

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riting Assignment #1! +uestions

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DC Circuit Anal$sis

! DC -o.er suppl$

! Load lines

! /&eenin euialents

! "aimum po.er transfer

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DC Benc& -o.er Suppl$

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eatures

! /&ree output studs pos, neg, and ground

! /.o control )no4s oltage and current! Built in ampolt meter

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6&eostat

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-art 1( -o.er Suppl$6&eostat

circuit to measure po.er suppl$

c&aracteristic

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-lotting Load Lines

! -lot t&e 789 cure of t&e po.er suppl$ fort&e settings t&at $ou put on t&e suppl$(

! or eac& r&eostat setting, plot t&e 789 cureof t&e r&eostat(

! 7erif$ t&at t&e circuit is operating at t&e

intersection of t&e source and load plots(! 7erif$ t&e t&e po.er suppl$ operates along

its plotted cure(

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-art 2( ind t&e /&eenin

euialent 4$ measurement(

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-art 3( Determine t&e maimum

po.er transfer to 6L

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&at load resistance leads to

maimum po.er transfer to 6L

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"aimum -o.er /ransfer

! 6eie. Section 5(% of Dorf and So4oda on

maimum po.er transfer(

! 7erif$ 4$ eperiment t&at t&e t&eor$ of

maimum po.er transfer presented in t&is

section is correct(

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DC circuits88 Summar$

! "easure t&e po.er suppl$ c&aracteristic,and determine circuit operating point 4$

plotting load lines(! Determine t&e /&eenin euialent of a

circuit 4$ measurement

! Determine t&e maimum po.er transfercapa4ilit$ 4$ measurement

! Compare t&ese .it& t&e t&eor$

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La4 :( AC signals8

nonsinusoidal! 6eie. of t&e concepts of rms, pea), p8p,

etc( for nonsinusoidal signals(

! -ulse trains definitions and measurements(

! Amplitude modulated signals(

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;onsinusoidal signals

2

0

1< =

T

rmst

V v t dt T =

=

0

1< =

T

dc

t

V v t dt

T =

=

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>t&er definitions

! -ea) oltage

! -ea)8pea) oltage

! AC 6"S oltage t&e rms component of a

signal .it& t&e dc alue remoed

( ) 12 2 2rms dc acrmsV V V= +

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or ac .aeforms

! Crest actor? peak

rms

V

V

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-ulse trains

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-ulse trains

Dut$ C$cle ? /on/

=

=

=

=

DT

t

ondc

DT

t

onrms

dtVT

V

dtVT

V

0

0

2

1

1

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Amplitude "odulation

An amplitude modulated .ae is

.&ere carrier .ae is modulated .it& t&e signal .ae

< = @1 < =Acos< =c sig cv t A v t t = +

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-re8La4s

! DC Circuits6ead t&e assigned material from Dorf

So4oda Section 5(% for maimum po.ertransfer plus sections on /&eenin euialentsand dc po.er(

! AC nonsinusoidal

Calculate t&e dc, rms and ac rms alues of t&esine, triangle, and suare .aes and t&e pulsetrains(