Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6 002 Electronic Circuits Spring 2007 Lab Practice Safety Handout S07 006 Introduction This handout discusses aspccts of thc cxpcri nc ital lab work that you will pcrforni in 6 002 It bcgins witli a discussion of good lab practice and ends witli a discussion of lab safcty You should pay spccial attcntion to tlic EECS Elcctrical Safcty Noticc attachcd to thc cnd of this handout Dcsk in tlic Lab in H07 As indicated it niust bc signcd and rcturncd to tlic EECS I istru ncnt ordcr for you to pick up your lab kit Your Lab Notebook Your lab notcbook should bcco nca coniplctc and pcrlnanc itrccord of tlic cxpcrimcnts you pcrfor n during thc scnicstcr Tlic notcbook itsclf should bc a bound hard covcr iotcbookwith graph rulcd pagcs Sincc your lab notcbook should co itailiyour raw cxpcrimc italdata you should ncvcr copy data into your lab notcbook from somc othcr papcr If you do not liavc your lab notcbook with you whcn you rccord your data you should staplc thc pagc of raw data into your lab notcbook Copying data into your lab iotcbookaftcr coniplcting an cxpcrinicnt risks beautifying your lab notcbook witli copying crrors Likc any lab notcbook your 6 002 lab iotcbookshould contaili tlircc distinct scctions for cacli cxpcri ncntpcrfornicd 1 thc dcsign analysis and prcdictio isyou co nplctcbcforc your cxpcrimcntal work 2 thc data and obscrvations you rccord during your cxpcriniclltal work 3 and tlic analysis and intcrprctations you colnplctc aftcr your cxpcrimc italwork If your lab notcbook is organized in this nianncr thcn anyone includi igyoursclf should bc ablc to pick up your lab notcbook at a latcr time and follow your prcli ninaryanalysis reconstruct tlic cxpcri ncntsyou pcrformcd rcproducc your raw data and rcacli cquiwlcnt conclusions Sincc your lab work is only uscful if it can bc cxplai icdto and rcproduccd by othcrs your lab notcbook niust bc niorc than analyscs and iunibcrswitli no contcxt Thc following guidclincs should hclp you producc niorc consistc itlab rccords witli clcas distinctions bctwccn your cxpcctations your actual data and your a ialysisof thc data P T Lab Wr r k Prc lab work is dcsigncd to notivatcand dcfinc your cxpcrinicnts and thus prcparc you for your in lab work Prc lab work sliould bc trcatcd likc a sniall liomcwork and sliould bc writtcli up in Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY your lab notcbook Thc qucstions askcd in thc 6 002 prc lab assig nncntsarc indicativc of thc typc of qucstio isyou sliould ask wlicn examining a scicntific or cnginccring hypothcsis Your analysis of thcsc qucstions should notivatcand guidc thc cxpcrinicnts you will pcrforni and suggcst how tlic cxpcrimc italrcsults will co ifirmor rcfutc thc liypotlicsis undcr examination Thc 6 002 prc lab assiglimcnts will gcncrally a ialyzcand prcdict thc pcrformancc of an clcctronic circuit and rcsult in prcdictio isfor thc data you will rccord during your in lab work As you work througli tlic assignments you should think about how you could cxpcrilncntally dctcrlninc whcthcr your analysis is corrcct If you do not scc how thc in lab work sccks to vcrify your prc lab work thcn ncithcr cffort is of valuc cvcn if both arc corrcctly pcrfor ncd Finally as you work on tlic prc lab assignnicnts you should takc thc time to icatlydraw tlic circuits you will build during your in lab work and to prcparc any graphs and tablcs ncccssary to organizc data rccording IT Lah W r k Thc notcs you takc during your in lab work arc siniply a rccord of wliat you did and wliat you obscrvcd A mi iinialrccord includcs at lcast tlic following 1 A labclcd circuit diagram in your lab notcbook adjaccnt to tlic rccordcd data Thc diagram should includc voltagc and currcnt sourcc a nplitudcsand frcqucncics rcsistor capacitor and inductor valucs scniiconductor and intcgratcd circuit namcs oscilloscopc and niulti nctcr and any otlicr co ilncnts co i icctions you think arc important to circuit opcratioli such as shielding coniponcllt tcmpcraturc and so on You should also notc or skctch your prcdictio is bcforc you takc a mcasurcnicnt 2 A rccord of your spccific proccdurcs and mcasurcmc its This should includc kcy oscilloscopc and nultilnctcrsettings sourcc adjustments niadc wliilc rccordi igdata small coniponcnt cha igcsand so on You should rccord raw data in your notcbook and intcrprct it latcr cvcn if latcr nicans only a fcw ninutcslatcr bcforc you niovc on to tlic ncxt cxpcrinicnt For cxa nplc if you usc thc voltagc drop across a rcsistor to lncasurc a currcnt you should rccord tlic mcasurcd voltagcs in your lab notcbook and convcrt thcsc nicasurcnicnts to currcnt latcr If any data is u icxpcctcdlylargc or small or noisy or noisc frcc for cxamplc or sonic adjustnicnt is particularly largc or scnsitivcl you sliould notc this in your lab notcbook as part ncccssary to rccrcatc of thc data Finally i icludcdin your notcbook should bc all coni nc its your cxpcri ncntalproccdurc Wavcfornis skctchcd dircctly from tlic oscilloscopc warrant a fcw additional guidclincs Ncvcr niakc a rough skctch that you will copy into your lab iotcbooklatcr cach tinic data is copicd from o i clncdiuni to anothcr ncw crrors and intcrprctations crccp silcntly into thc data Rathcr icatlyskctcli tlic wavcform dircctly into your lab notcbook as accuratcly as possiblc Sucli skctchcs should bc at lcast as largc as thc oscilloscopc scrccn and arc no st accuratc if you lct thc rulcd syuarcs of your notcbook graph papcr corrcspo idto thc rulcd graticulc on tlic oscilloscopc scrccn 3 Coninicntary about i iaccuracicsin your data Rccord and plot prcciscly what you scc as accuratcly as possiblc do not rccord what you cxpcct to scc Rclatcd to thc accuratc rccording of data is tlic issuc of precision You 111ust indicatc in your data how prccisc your rcadings arc Sucli an i idicationcan bc as simplc as an cstiniatc of tlic ioiscin thc mcasurcnicnt Wlicn skctcliing oscilloscopc data bc surc to indicatc thc tracc width and any othcr rclcvant fcaturcs of tlic wavcfor n Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY Post Lab Wirk Post lab work conccrns your
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