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AnsweredIE LAB 2 SCR
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AnsweredIE LAB 2 SCR
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Lab 2
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BAT BA TANGAS STATE STATE UNIVERSITY UNIVERS ITY COLLEGE OF ENGINEERING, ARCHITECTURE ARCHITECTURE AND FINE ARTS ELECTRONICS ENGINEERING DEPARTMENT
Experiment 3 Crrent Crrent C!ntr!" !# $n SCR
S%mitte& %'( Bri!ne), Anne M$r*$ret R+ C$ti"!, !-n C$r"! M$*n&$'$!, I$n De.in S+ ECE /012
S%mitte& t!( Dr+ Gi" B+ B$rte In)trt!r
Septem%er 0, 2104
I.
OBJECTIVE: 0+ Dem!n)tr$te t-e e5et t-$t *$te rrent -$) t! trn !n $n SCR $n& t! &etermine t-e minimm -!"&in* rrent t! 6eep t-e SCR !n&tin*+ 2+ 2+ De7ne p$r$meter) $))!i$te& 8it- SCR), )- $) *$te tri**er rrent, -!"&in* rrent+ #!r8$r& ON9)t$te .!"t$*e $n& *i.e t-e $ppr!xim$te r$n*e !# .$"e) expete& #!r t-e)e p$r$meter)+
INTRODUCTION: T-e experiment )-!8) t-$t ):ient *$te rrent m)t ;!8 in !r&er t! trn !n t-e SCR $n& t-$t t-e minimm -!"&in* rrent $n %e #!n& 8it- t-e $&&iti!n !# "$r*e9.$"e p!tenti!meter in $n!&e irit+ II.
MATERIALS :
0 Fixe& < 029V p!8er )pp"'
0 2296 re)i)t!r $t 1+14@ R B
0 St$n&$r& !r &i*it$" .!"tmeter
0 01196? re)i)t!r $t 1+4@ R A
0 St$n&$r& !r &i*it$" $mmeter
0 41 6? p!tenti!meter RH
0 C 01=Y" SCR !r e>i.$"ent
2 SPDT )8it-e& S0 $n& S2
0 011? re)i)t!r $t 1+14 @ R 0
0 Bre$&%!$r& #!r C!n)trtin* irit
III+
PROCEDURE(
0+ C!n)trt t-e irit )-!8n in 7*re 0+ 2+ Set %!t- )8it-e) $) in&i$te& $n& t-en $pp"' p!8er t! t-e irit+ 3+ C$""$te t-e *$te rrent I RA, ;!8in* t-r!*- RA $n& re!r& in t$%"e 0+ /+ Me$)re VA $n& re!r& in t-e p"$e in&i$te& next t! IRA+ I) t-e SCR !n !r !5 4+ M!.e S0 t! p!)iti!n B+ =+ C$""$te t-e *$te rrent I RB ;!8in* t-r!*- RB $n& re!r& in t-e p"$e in&i$te&+ + Me$)re VA $n& re!r& in t-e p"$e in&i$te& next t! IRB+ I) t-e SCR !n !r !5 + Rem!.e t-e p!8er )pp"' .!"t$*e #r!m t-e irit+ + M!&i#' t-e irit %' $&&in* t-e $mmeter $n& 416? p!tenti!meter R H in )erie) 8it- "!$& re)i)t!r R L+ 01+Set t-e 8iper R H )! t-$t t-e re)i)t$ne i) !mp"ete"' )-!rte& !tJ+ 00+ M$6e )re t-e S0 $n& S2 $re )et $) in&i$te& $n& t-en $pp"' p!8er t! t-e irit+ 02+M!ment$ri"' m!.e S 0 #r!m p!)iti!n A t! p!)iti!n B $n& %$6 $*$in+ "3+Re!r&in* t-e re$&in* !# VA $n& IA in t$%"e 2+ 0/+S"!8"' $&K)t RH )! t-$t t-e rrent IA %e*in) t! &ere$)e+ 04+Remem%er t-e re$&in* !# IA 8-en VA inre$)e) t!
IV+
RESULTS
Sim"$ti!n )in* m"ti)im Fi*re 0+ @it-!t P!tenti!meter S0
S2
IRA VAARA
IRB VAARB
A B
A A
00+4 nA 1A
1A 4/4+ /44 A
VA 00+= V 00+= V
C!n&iti!n ON !r OFF ON ON
T$%"e 2 Fi*re 0( @it- p!tenti!meter
P!tenti!meter )ettin* 1 4 01 21 31 /1 41 =1
VA
+2/ V +0/ V +1/ V + V +4 V +0 V +=4/ V +40 V
IA
1+0= 1+0= 1+0= 1+221 1+241 1+21 1+3/= 1+/2
mA mA mA mA mA mA mA mA
1 1 1 011
+/3 V +02 V +4 V +/ V
1+4=2 1+0 0+411 +111
mA mA mA mA
In t-e t$%"e $%!.e 8e $n !%)er.e t-$t $) t-e p!tenti!meter )ettin* *!e) -i*-, t-e V!"t$*e #r!m $n!&e t! $t-!&e &ere$)e) *r$&$""' %e$)e t-$t i) t-e #nti!n !# $ p!tenti!meter+ A) $) t-$t -$ppen), t-e $n!&e rrent inre$)e) )"i*-t"' %e$)e t-e re)i)t$ne %"!6 )!me rrent t-$t 8i"" %e )een in t-e $n!&e+
FILL9IN UESTIONS 0+ I# t-e *$te re)i)t!r i) t!! "$r*e, n!t en!*- *$te rrent 8i"" ;!8 t! trn !n t-e SCR+ 2+ @-en t-e *$te re)i)t!r i) "$r*e en!*-, t-e pr!per .$"e !# *$te rrent 8i"" ;!8 t! tri**er t-e SCR+ 3+ S:ient *$te rrent i) re>ire& t! 6eep t-e SCR !n&tin*+ /+ I# t-e "!$& re)i)t$ne in )erie) 8it- t-e $n!&e i) t!! "$r*e, n!t en!*V+
rrent ;!8) #r!m $t-!&e t! $n!&e $n& t-e SCR 8i"" trn !5+ ANALYSIS OF RESULTS
Fig. 2.1: Switch Conition !S 1: A" S2: A#
Fig. 2.2: Switch Conition !S 1: B" S2: A#
VI. $UESTIONS AND PROBLEMS 0+ H!8 m- *$te rrent i) nee&e& t! tri**er $ me&im p!8er SCR T! tri**er $ me&im p!8er SCR, t-e nee))$r' *$te rrent m)t %e m- "!8er t-$n t-e rrent t-r!*- t-e SCR #r!m $t-!&e t! $n!&e+ 2+ A#ter $n SCR -$) 7re&, 8-$t e5et &!e) t-e *$te )i*n$" -$.e !n t-e SCR T-e *$te )i*n$" i) )e& t! tri**er t-e &e.ie int! !n&ti!n %' K)t t-e $pp"i$ti!n !# $ )m$"" .!"t$*e+ 3+ @-$t e5et &!e) $n inre$)e in $n!&e rrent -$.e !n $n!&e9$t-!&e .!"t$*e T-e inre$)e in $n!&e rrent -$.e n! e5et !n t-e $n!&e9$t-!&e .!"t$*e+ T-e )r 8i"" rem$in !n n"e)) t-e $n!&e rrent &r!p) %e"!8 t-e -!"&in* rrent+ /+ Exp"$in 8-' $n SCR i) )peri!r t! $ )erie) r-e!)t$t #!r !ntr!""in* $n& "imitin* rrent t-r!*- $ "!$& An SCR i) )peri!r t! $ )erie) !# r-e!)t$t) %e$)e me-$ni$" p$rt) !# r-e!)t$t) !rr!&e $n& %re$6 $#ter )!me time 8-i- $n $)e t-em t! m$"#nti!n+ R-e!)t$t) $re n!8 %ein* rep"$e& %' SCR) &e t! t-e $#!rementi!ne& $)e+
4+ Exp"$in t-e &i5erene %et8een $n SCS $n& SCR+ A Si"i!n9C!ntr!""e& Reti7er, !r SCR, i) e))enti$""' $ S-!6"e' &i!&e 8it- $n extr$ termin$" $&&e&+ T-i) extr$ termin$" i) $""e& t-e *$te, $n& it i) )e& t! tri**er t-e &e.ie int! !n&ti!n "$t- it %' t-e $pp"i$ti!n !# $ )m$"" .!"t$*e+ T-e Si"i!n !ntr!""e& )8it-, !r SCS, ) t-e next )tep %e'!n& t-e SCR+ It i) )ti"" $ #!r9"$'er &i!&e, %t n!8 8it$"" #!r re*i!n) $re $e))i%"e+ T-e SCS -$) $n $&&iti!n *$te "e$& 2 *$te "e$&) in t!t$"+
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