ࡱ> DFC^e7 ;&bjbjUU Lt7|7|3Yl8,D|52@ 4444444$6 94  | 4(@5((( L@4( 4(p(,`/t^0@ и=l+!`/050509(90( MSURAREA REZISTENbELOR CU PUNbI DE CURENT CONTINUU 1 Scopul lucrrii: Se va studia schema _i componenca diferitelor punci de curent continuu existente. Se vor efectua msurtori de rezistence n domeniul 10-5(-107( _i se va determina eroarea _i sensibilitatea pentru puncile respective. 2 Desf_urarea lucrrii: Schema de principiu a puncii Wheatstone: Schema de principiu a puncii duble: Panoul frontal al unei punci Wheatstone-Thompson tip RWT4 4,05:  Pe panoul frontal din figur sunt o serie de borne _i loca_uri pentru fi_e cu urmtoarele roluri: Borne pentru rezistenca de msurat Rx, acre poate fi cuadripolar sau bipolar. n cazul msurrii unor rezistence bipolare bornele se scurtcircuiteaz dou cte dou. Loca_uri pentru alegerea modului de lucru cu puntea: - pentru puntea Thompson fi_a se introduce n loca_ul Wh iar pentru puntea Thompson fi_a se afl n loca_ul Th. Loca_uri pentru alegerea raportului a/b cu care se lucreaz n cazul puncii Wheatstone. Butoane de pornire, respectiv de reglare a sensibilitcii puncii. Prima dat se apas Brut _i se efectueaz reglaje, iar cnd indicatorul de nul este aproape de zero se apas Fin _i se efectueaz reglajul final. Loca_uri pentru alegerea raportului n cazul de lucru cu puntea Thompson. Cele dou fi_e se introduc n loca_uri cu acela_i marcaj. n cazul lucrului cu puntea Wheatstone fi_ele se vor pune n loca_ele marcate cu Wh. Borne pentru legarea galvanometrului. Borne pentru legarea sursei de alimentare a puncii, respectnd polaritcile. Puntea Wheatstone se alimenteaz cu 4,5-5V, iar puntea Thompson 2-2,5V. Butoane pentru reglajul lui R respectiv R1, R2, pentru a obcine indicacia nul, n care caz valoarea se va citi nmulcind valoarea reglat cu indicaciile corespunztoare. Indiferent de puntea folosit raporturile se aleg astfel ca la reglaj s se foloseasc toate decadele rezistencei R respectiv Re, caz n care puntea are precizie maxim. Panoul frontal al unei punci Kelvin de tip TMT2:  B  buton pentru scurtcircuitarea de proteccie a instrumentului de nul IN, se cine apsat n timpul reglajului; P1  buton pentru alegerea tensiunii de alimentare U=Z sau U=0,1Z unde Z este tensiunea sursei; P2  stabile_te valoarea raportului; P3  reglaj fin. Caracteristici de utilizare: Factorul de multiplicareDomeniul de msurEroarea [(]Eroarea [%]0,0010,0005-0,0060,00010-0,010,005-0,015 0,015-0,060,00015 -- 10,10,05-0,15 0,15-0,60,0015 -- 110,5-1,5 1,5-60,015 -- 1 Tabel cu rezultatele msurtorilor cu puntea Wheatstone: Nr. Crt.Rez Rxa [(]a/bR [(]Rx [(](1 [div]R1 [(](2 [div]R2 [(]Ri [(]R|x [(]Rmed [(]S [(](r [%] Obs.43000104323432302433231653234523430004312090,465V, rezistenc mare6001/106013601,311631,312571,3599,996600600,65229,998Pentru cazul echilibrrii perfecte (1=(2=0 _i R1=R2=R;  EMBED Equation.3 . Apoi se face o dezechilibrare forcat spre dreapta cu (1R1 _i una spre stnga cu (2R2. R=Ri; Rx=R|x;  EMBED Equation.3 ;  EMBED Equation.3 ;  EMBED Equation.3 unde S este sensibilitatea puncii;  EMBED Equation.3  unde (rc este eroarea constructiv iar (rd eroarea relativ de determinare pentru situacia cu interpolare;  EMBED Equation.3 . Tabel cu rezultatele msurtorilor cu puntea Thompson: Nr. Crt.Rez Rxa [(] aRe [(]R [(]Rx [(](1 [div]R1 [(](2 [div]R2 [(]Ri [(]R|x [(]Rmed [(] Obs.3,2100001033333.33830336363333763.23.2672,5V, rezistenc f. mic1,6100001019001.91116909219019651.61.75a/b=1; a=b;  EMBED Equation.3  rezistenca necunoscut Se face o dezechilibrare forcat spre dreapta cu (1R1 _i una spre stnga cu (2R2. Rezistenca interpolar  EMBED Equation.3 ,  EMBED Equation.3 ,  EMBED Equation.3 ,  EMBED Equation.3 ,  EMBED Equation.3 . Eroarea absolut  EMBED Equation.3 . Valoarea probabil a rezistencei msurate va fi situat n domeniul calculat cu formula:  EMBED Equation.3 . Powered by  HYPERLINK "http://www.referat.ro/" http://www.referat.ro/ cel mai tare site cu referate LUCRAREA NR.1Rusu-Marian CristinaMsurarea rezistencelor cu punci de curent continuuan II, grupa 1622 BPAGE 2 Msurri electrice _i electronicecalculatoare   EMBED PBrush   EMBED PBrush   EMBED PBrush   EMBED PBrush  hjFvx"4X vx FHZ\hjnp6|~ jREHUjF@ CJUV ja 5CJH* je5CJ 5CJH* ja5CJCJ jW5CJ5CJ jU6 jWH*565EhjDFx$&(*,.024$`a$B$$Ifl0H(ZZ4 la $$Ifa$$a$f$%:&4 , 6VX$`a$$ & Fa$$a$$a$` >d| $$Ifa$$a$ mxdddd $$Ifa$$$IfT\A04 a "&mddddddd $$Ifa$$$IfT\A04 a&(0DVdhlprvmdddddddmtdd $$Ifa$$$IfT\A04 a  2<d__$a$$$IfT\A04 a $$Ifa$ <DLTX`fntLFf $$Ifa$$06@FPZfr~Ff $dh$Ifa$$ & Fdh$Ifa$  0246$6@HPRV\dhpv~ $$Ifa$$a$$`a$Ff $dh$Ifa$BDxz 0246|~$JL^`jlxz~ jW5CJ5CJ6 jEEHUj F@ CJUVH* je j8EHUjSF@ CJUV jEHUjF@ CJUV j EHUj F@ CJUV j\ EHUj<F@ CJUVH* ja jU6~  F H J L !!R!T!z!|!~!!!!!!!!!!!!!!!!""""" j&EHUj.F@ CJUV j:$EHUjF@ CJUV j "EHUj.F@ CJUV jEHUj<F@ CJUV ja jEHUj-F@ CJUV jUCJ 5CJH* jW5CJ5CJ ja5CJ4",0:< $dh$Ifa$$ & Fdh$Ifa$Ff $$Ifa$:>HRZf   | $a$Ff$ & Fdh$Ifa$FfM $dh$Ifa$| $!L""#### $\$^$`$igu$$Ifl  6 0644 l` a$$&#$/Ifa$$a$$`a$ ""B"D"F"H"n"p"""""T#V#|#~##########$$\$`$b$j$$$$%B%D%F%R%T%V%X%Z%%%%%%Ļz0JmHnHu0J j0JU5CJCJ0JCJOJPJQJjC/CJOJPJQJUjCJOJPJQJUCJOJPJQJCJ j-EHUj/F@ CJUV j*EHUj\/F@ CJUV j(EHUj F@ CJUV jU/`$b$d$f$h$j$$$$%B%D%Z%%%%%%$)&#$>$$IfT01!& a $$Ifa$$Ifh]h$a$%%%% & && &4&5&6&7&8&9&:&;&$a$%%%%%%&&& & & &&&&& &!&0&1&2&3&;&þ jqKUjF@ UV j=Uj F@ CJUVmHnHu jr=UjE@ UV jU j/Uj&E@ UV(&P . 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