EXPERIMENT 1 Diode Characteristic and Rectifier Circuit.doc

7/27/2019 EXPERIMENT 1 Diode Characteristic and Rectifier Circuit.doc

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ENT 162 Analog Electronics Laboratory Module

LABORATORY MODULE

ENT 162Analog Electronics

Semester 2 (2012201!"

E#$ER%MENT 1 & Dio'e )aracteristics an' Recti*ier irc+it

Name &____________________________________________________

Matri, No- &______________________

Sc)ool O* Mec)atronic Engineering

Uni.ersiti Mala/sia $erlis

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E#$ER%MENT 1

Dio'e )aracteristics an' Recti*ier irc+it

$art A& Dio'e % )aracteristics

1- OBET%E&

1.1 To exaine t!e "oltage#current $%#&' c!aracteristics of diode.

2- $ARTS AND E3U%$MENT&

2.1 1 () resistor # 1 Pc

2.2 1N*1*+ silicone diode # 1 Pc

2., Multieter # 1 Pc

2.* - #1 %/0 oer suly # 1 Pc

2. 3readboard and ire

!- %NTRODUT%ON&

A diode is said to be in forward bias !en t!e diode4s anode is at a !ig!er otential t!an its

cat!ode. 0urrent ill flo t!roug! t!e diode fro anode to cat!ode. A diode is a nonlinear

de"ice in t!e sense t!at t!e current is not roortional to "oltage difference across it. 5!en

t!e diode is in forard bias condition a sall "oltage dro called t!e barrier potential,

occurs across t!e diode. Tyical "alue is aroxiately at -.7 % for silicon and -., % for

geraniu $easured at roo teerature'. A sybol and in configuration for diode is

s!on belo.

/iode forard resistance 8f

T!e deterination of 89, t!e diode forard resistance is s!on gra!ically in 9igure 1.1.

Rf =d

d

I

V

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9igure 1.1 :ra!ic deterination of diode forard resistance.

4- $ROEDURE&

*.1 ;sing your /MM select a lo#resistance eter range. T!en connect t!epositivelead

of t!e /MM to t!e diode4s anode terinal !ile t!e negative lead is connected to t!e

diode4s cathode terinal as s!on in 9igure 1.2$A'. T!e /MM4s internal battery t!en

forward biases t!e diode. Note t!e resistance reading. 8ecord your result in Table 1.1.

&f a /MM it! a !4s la in eac! case.

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*.*Plot t!e resulting static diode cur"e $diode current "ersus "oltage' on t!e gra! age in

t!is exerient. :ra!ically deterine t!e diode4s barrier otential $%3' and forard

resistance $89' recording your results in Table 1.2.

9igure 1.2$A' 0onnection beteen diode and /MM

9igure 1.2$3' Exerient setu

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Name ______________________________ Date ______________

Matri, No ______________________________

5- RESULTS OR E#$ER%MENT 1(A"&

Table 1.1 /iode testing it! ultieter

Meter Lea's

Ste7 8 Res+lt

1 Anode 0at!ode

2 0at!ode Anode

Table 1.2 9orard biased diode c!aracteristic cur"e

oltage across1 9: Resistor

Dio'eoltage

Dio'e or;ar'+rrent

-.1 %

-.2 %

-., %

-.* %

-. %

-.6 %

-.7 %

-.+ %-.B %

1.- %

,.- %

.-%

7.- %

B.- %

%nstr+ctor A77ro.al ____________________ Date _____________

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Name ______________________________ Date ______________

Matri, No ______________________________

6- ALULAT%ON OR D%ODE OR


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$art B& Dio'e Recti*ier irc+it

1- OBET%E&

1.2 To deonstrate t!e c!aracteristics of to different diode rectifier circuits !alf#a"e

rectifier and center#taed full#a"e rectifier.

2- $ARTS AND E3U%$MENT&

2.1 1 () resistor # 1 Pc

2.2 1N*--1 silicon rectifier diodes # 2 Pcs

2., 12 %rssecondary center#taed transforer # 1 Pc

2.* 1-u9 caacitor # 1 Pc

2.* /ual trace oscilloscoe # 1 Pc

2. Multieter # 1 Pc

2.6 3readboard and ire # 1 Pc

!- ALULAT%ON =U%DE

>al*;a.e recti*ier

/0 "oltage outut C

BS VpeakV )( $sine a"e inut' $,.1'>utut freDuency C inut freDuency $,.2'

enterta77e' *+ll;a.e recti*ier

/c "oltage outut C

BS VpeakV )(2 $sine a"e inut' $,.,'>utut freDuency C 2 x inut freDuency $,.*'

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4- $ROEDURE&

*.1 5ire t!e !alf a"e rectifier circuit s!on in 9igure 1.,$A'. 3e "ery careful to a(e sure

t!at connections to t!e 2*-% riary of t!e transforer are roerly rotected. Note

t!at neit!er of t!e transforer4s riary leads is grounded !ile t!e center#taed

secondary lead is not used in t!is section.

*.2 et your oscilloscoe to t!e folloing aroxiate settings

0!annels 1 F 2 %Gdi"ision dc couling

Tie base sGdi"ision

Aly 2*- %A0 $rs' to t!e transforer4s riary leads. 0onnect one scoe robe

to t!e anode terinal of t!e 1N*--1 diode $oint A' and t!e ot!er robe to t!e diode

cat!ode terinal $oint 3'.Hou s!ould obtain t!e a"efors s!on in 9igure 1.*.

*., 9ro t!e oscilloscoe easure t!e transforer4s ea( secondary "oltage I%$ea('J

as ell as t!e ea( "oltage I%-$ea('J across t!e 1() resistor recording your results in

Table 1.,.

*.* 5it! your ultieter easure t!e dc "oltage $%/0' across t!e 1 () resistor and

record your result in Table 1.,. 0oare t!is result it! t!at obtained fro t!e

eDuation for t!e a"erage or dc "oltage of a !alf#a"e rectifier $EDuation 1'. >bser"e

bot! a"efors.

*. Turn off oer to transforer. Add one 1-u9 caacitor in arallel it! t!e load resistor.

Negati"e side of t!e caacitor s!ould be grounded.

*.6 Turn on oer to transforerMeasure rile "oltage ea(#to#ea( at t!e outut using

oscilloscoe.

*.7 Turn off t!e oer to t!e transforer and ire t!e center#taed full#a"e rectifier

circuit s!on in 9igure 1.,$3'. Pay careful attention to t!e olarity of bot! diodes and

t!e connections to t!e 2*-% riary of t!e transforer. T!e center#taed lead is

grounded for t!is section.

*.+ No set your oscilloscoe to t!e folloing aroxiate settings

0!annels 1 F 2 %Gdi"ision dc couling

Tie base sGdi"ision

Aly 2*- %A0 $rs' to t!e transforer4s riary leads. 0onnect one robe to t!e

anode terinal of t!e 1N*--1 diode $oint A' and t!e ot!er robe to one of t!e

diode4s cat!ode terinals $oint 3'.Hou s!ould obtain t!e a"efors as s!on in

9igure 1..

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*.B 5it! your oscilloscoe easure t!e transforer4s ea( secondary "oltage $%' it!

resect to t!e grounded center ta as ell as t!e ea( "oltage %-$ea(' across t!e 1

() resistor recording your results in Table 1.,.

*.1- 5it! your ultieter easure t!e dc "oltage $%/0' across t!e 1() resistor and record

your result in Table 1.,. 0oare t!is result it! t!at obtained fro t!e eDuation for

t!e a"erage or dc "oltage of a center#taed full#a"e rectifier $EDuation ,.,'. >bser"e

bot! a"efors.

*.11 Turn off oer to transforer. Add one 1-u9 caacitor in arallel it! t!e load resistor.

Negati"e side of t!e caacitor s!ould be grounded.

*.12 Turn on oer to transforer. Measure rile "oltage ea(#to#ea( at t!e outut using

oscilloscoe.

9igure 1.,$A' Kalf a"e rectifier circuit

9igure 1.,$3' 9ull#a"e rectifier circuit

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9igure 1.* Tie base sGdi"ision

9igure 1. Tie base sGdi"ision

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Name ______________________________ Date ______________

Matri, No ______________________________

5- RESULTS OR E#$ER%MENT 1(B"&

Table 1., 8ectifier data

Recti*ier

T/7eMeas+re' E,7ect

e' D

? Error

S(7ea9" 0(7ea9" DRi77le (7ea9

to 7ea9"

Kalf#a"e

9ull#a"e

$center ta'

6- ALULAT%ONS

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%nstr+ctor A77ro.al ____________________ Date _____________

Name ______________________________ Date ______________

Matri, No ______________________________

@- D%SUSS%ON&

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- ONLUS%ON&

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EXPERIMENT 1 Diode Characteristic and Rectifier Circuit.doc

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