manual thomson 3bscientific

8/22/2019 Manual Thomson 3bscientific

1/8

38 SCIENTIFIC@PHYSICS

lnstruation heet

whenopratingubes,he erminals aybe ive o

Clampinsawsor lubesHoesfofnser t ingelm-Rtain ingl iderStockor tubesandptka

The ubeholder ccommodateslL ubes t theDemondrarionies 9l50 Ll9l_l ( l tL 520Tfl 5s5)ardl 'c irr,c$ores.J(h ( l 'eDemoi.stral ion elmholtz oikU19105TEL 02) ndDemon\trrnAu\i l iryoi lU q 0b l L 507) lurthe 0pi icalAnloguequipment 19172 TEL555A).Thc .rbp older,on\i \r \f d powder-carpdr uminiumselte4)wlth nupr ighttan(hion(l ) and fork-shapedolder or hot aihodeubes

high ohageshatardangerouso touch.. Do not mod y (i ,(Lrir! n le5sl l porer up-pl ies re urnd .. Do not mount or remove ubesunlessapower uppliesareurned ff .


2/8

Ih.rr n bp olFd) lbO'and smdde l hedrresistant,ighly nsulatins lastic.he tubesarescurednto prunglmps i th etainingl ider\.Twoholes re bored n the b:sep ate o accom-modate pair fdemonqrtionelmholtzoi ls tthe Helmholtzepardt ionistance"orgeerai inga uniformmsnelicield. h tubeholder ests nthree on-sl ipubberlet.

4.2Setting p rhe Helmholtz oils. Plce he tLrbe n the holderas described. InserrheHelmholtzubesnto heholes iththe onectionsacinBouiwards.Push hesleevesn the rodupwards nd nseri he rodalanan8le.. Pt(h he tleevesnto the hole5o se(urel"e4.3Setlins p he auxiliary oil. Placetheoi lonheupperfork.. Pushhe retainingl ider ver he ip of theauxi l iaryoi l ose(urehe oj l nplace.4.4stlingup he optl(alanalogueq|lpment' Insenl.e Jminiun

v wirh he rdt inBnlothe tanchlonrom ehind.

Dmensonsi

Werghl :

240 180 350mm'76mm2kg

4.1Setting p and removingot (athodeubes. Tubes hould ol be mo unred r remo\edunlessl lpoweruppl ies.e isconnected,. Pushhe w lamp l idersn hesrrchionlthe ubehoder rightback o hat he aws. Pushhebossesfth ubento hejaws.. Pusl'he wclanps orMrdr rhestancl" nstosecufehe ube i thinhe aws,. To emoveh ube, ushhe awclampsiehtback gain nd ake he ubeoutol the aws.

ATELTRONroductlromrKIB .ienlificid..8 Beaconlieldoad WestoniuDerlMare'Some6etS231YETel00440)193425lll . Fax 0440)191425314 e.mail k3bs@3b(ientifk..omTechnica mendmentsreposible


3/8

3B SCIENTIFICc)HYSICS

lnstructon heet

1.Drcrlrtlonlhe Helmholtzcoils are u5ed o create magneilcf re los o' dct lF i f inS lef l ror beamsdrd F aLtachedo the ubeholderU19100he iubeholdefal lowshe coik o bestup n Helmhol izonigufa 't io io Benerale highlyuni iormmagnei iciedperpendicularo theaxis f he ube.Ihe lwo lr ' f i l led oi lsremadeol lacqueredop_perwireon a plast ic obbin n an nsul lrngtandrod with piastlcs eeves or insertion nio speclallydr i l ledhole! on the demonnrat ionube holder .Coectionsare labelled rom lhe nart (A) o iheend Z)of hecoi lwlndins.

:ix''f

3Co

4

Nlagnet iclux inHelmholtz-confgurai loni

1.5A rnax.0mn)2.0A(max. lmjn)6l) approx.

, :. g$lratio'rnserrh Helmhol lzubes nto he

Number Jwinding(ol ld iameter : 320each136mm pprox.l45mmx8mmO

1.0

holdrwiththe onnectionscingutwards.. Pr\h he lee\e! n hF odup$rd\ rd n\efthe od nio hehole5atanngle.Push he s eevesnto the holr o secureheForseriesonnection,onnectocket ol coi 1to ,ocket of coil2 (relero Fig1.1).Take ntoac.ount he otaL urrentwhen altu'at lng .Forparallel onnection,onnectocki of coi1 to sockel of coil2 and ockeiZ ol coil1 tosocker of coil2 refero Fig1.21.


4/8

To calculate the total current / shouldbehalved in(bothcoils avehesame esirtanceandhalf hecurrentpasseshrough ach ne.

Fig. ,15risconnectionMakesurethonndo|s Fig. .2Panlll onndionof each oilare acins utwa s

AfELTRoNrodo.tfrom K3B cientificttd.. Beaconlield oad.Wefon-sueFMareSome6er S231YEre 00440)193442s333.ax 0440)193425334. -mailuk3bs@3b


5/8

38 SCIENTIFIC@ HYSICS

Instruction sheet1. Fluofescentcreen2. Lower eflect ioate3. Bosswith4-mmPlugforconectingeflecUonplates4. Electronun5, 4-mm socketsorconnecllng etersLrp_6.4-mm Plug or con'7. Upper eflecl lon late

Hot cathode tubes are th in-wl led, h lghlvevacJdredglss tubes, Treat t l_emcre'J !as there s a r isk of i fnplosion.. Do not subject he tube to mechanicalDo not exceedhe statedoperatg a_rameters, f voltageor current s too highor the cathodes at thewrong empera-ture, i can ead o the ubebecominge-

When he ube s n operat ion,he ermin. lsof the ubemybe at high ol tages i ihwhich t is dangerouso come nto contact

. Onlychangecircui tswi th po\rersupplvequiprnent wi tched ff. Only exchangeubeswith powefs0pplvequipment witched f f .When the tube is operat lon, he stockoi the

. I f necessary, l low he tube to cool beforedismant l ing.

The demonstraf ionele. l ron-bearr def acl io_rube rs ten. led o- invesLigl :19hedef le l_Lionol e lectrcnber is ra e lect- ical nd -ndgnet ic f le lds. ! can be used to est imate he


6/8

Fllaent oltagei

DefleclorplalevoltageiplatesiFluorescentcrcenrGlass ulb:Total ength:

3 7,5 V ACIOC1000v-5000vDc5000 ax.54mmapprox,90mmx60mm130mm0 aPprox260mmaPprox

speclfic charge of an electron e/m and todeiermine the electronvelocity vThe electro-beam deflection tube comprrsesan electron gun which mits a narrow foctrs-sed ribbon of cathode rays within an evcu-ared clear glss bulb A tungsten 'hairp '1f l lament hot cathode s heated dlrect ly andihe anode takes the form of a cvllnder' Thedef lecL'on f rays can be chievedelectro-srat ical 'y y meansof a bul lF in plate cpac-tor formed by the palr of deflection plates ormagnetically with th help of the demonstra-t i Helmholtzcoi ls U19105 (TEL 502) mag-ner lcal lv , he caLhooeays a'e inLercepLedya f lat mica sheet ,one s ide of whlch s coatedwith a f luorescent creenad the other sideof whi .h is pnnredwlth a cent lmeL'e raLrculeso lhat the patn oi ihe eleckors can be easi lytraced. Th mlca shel is held at 15 o theaxrsof the tube by rne two def leci lng ltes

4.1 stting uP the electron'beam deflec-t on tube in the tube holder. The Lubeshould not be moLrred or re-moved Jr less l l power


7/8

An electronwith velociry v passing hroughLheelectr ic ieldE produced y a plateca-pacitor eldat a voLageD i tha plate pac-ing d is deflected nto the curved path of aprabola overned y lhe equation:1e F "=- -x- \z)where is the lnear ef lect ionchievedvera l inear istancex..5.3 Calculat ing /m und y5,3.1 By means of magnetic deflectionr Setup hexperiments n Fig1.Yhevelocitys dependert n the anode olt-ageUa uch hat:rv = 12=uSolvlng quations and3 simultaneouslvesthe followlng expression for lhe speclficEnarce /m,

(4)Ua can be mesured lrectly,a nd r can bedelermlnedxperlmental ly,5,3.1.1Determlnlng'he radlus 'cJ.vature ls obrained eo-nef-r lcal ly s n Flg, l

r , = x, +(r-y) ,so hal l x2 +v2r = --;--.5,3,1,2Calculai lngThe magnetlcluxA of a magneticieldgen-eraredby lh e He lmholtz orls n Helmholtrgeometry ndLhe ol lcurrenL canbe ccu-

(6)

wherek = in goodapproximation ,2 rTlAwilhn = 320(windings)ndR = 68 mm (coi lradius).5.3.2 By means of electric deflecton. Setup heexperiments n Fig2.e/m can be calculaled rom equation2:e 2y v'zwhereF -:4wlth Up= dfectorplatevoltageand d =plate pacing.5.4 By meansof f ield compensation' Setup theexperiments n ' lg 2. sel Jothe -elrrholu cols addifonal ly s 1 ex-perlmenl5, l Flg1),. Tu.n on rhe high-Lenslonowersupp.onl tsanddeflecthe beam lectr lcal ly,. Eherglsehe Helmholtz oi lsand adjustthe voltagen sucha way ht he r iag-netlc field compensateshe electrlc leldand he bem s o longerdeflectedThe magnerrc eldcompensateshe dei le(-tronof the electrcn earn aused y the elec-tr ic leldr e E=e v ETheveloclty cnbe calc! latedi

BwhereF= 2. For

(8)the calculat ionf I refer

to polnt5,3,1,2,The spclfic harge/m can be ca culatedle 1 r6t 'zm 2U^ r\B)

I =11)'ts l


8/8

rJ2106!/]VJI

Fl9, 1 I.,lagnetic eflectlo

Y)!'"X ---_-l,\ t-"-----------"Jv ! 6,3v^I Q ooFlg.2 Electrlc erectlon

f-L

a- x ---- ---1

A TELTRoNProducttom UK3BScientificLtd ' 8 Beaconsfield oad Westor-supr-MareSo-' - --- - "r."t SSz: 1lE Tel00440)193425333'Fax0044 0)19i4425334'e-marluk3bsA3bscientificomTechnischeinderungenorbehalten

manual thomson 3bscientific

Documents