Dab tsi yog txoj cai kev khiav hauj lwm rau clamp ammeters? Yuav ua li cas khiav ammeter
Lub ammeter yog hais txog ib qho cuab yeej siv los ntsuas qhov tam sim no hauv AC thiab DC circuits. Hauv daim duab kos duab, lub cim ntawm ammeter yog "Vaj Huam Sib Luag A". Tus nqi tam sim no yog nyob rau hauv cov qauv ntawm "ampere" lossis "A".
Kev ua haujlwm thiab siv cov clamp ammeters
Ib qho clamp hom ammeter yog kev sib xyaw ua ke ntawm tam sim no transformer thiab ammeter. Cov tub ntxhais hlau ntawm qhov tam sim no transformer tuaj yeem qhib thaum lub qhov ciaj ntswj nruj; Cov hlau los ntawm qhov ntsuas tam sim no tuaj yeem dhau los ntawm qhov qhib qhov sib txawv ntawm cov tub ntxhais hlau yam tsis tau txiav nws tawm. Thaum cov ciaj ntswj raug tso tawm, cov tub ntxhais hlau kaw.
Thaum siv lub clamp hom ammeter txhawm rau txhawm rau ntsuas tam sim no, nws yog ib qho tsim nyog yuav tsum tau txiav hauv ib qho ntawm cov xov hlau uas tau sim (xaim). Clipping nyob rau hauv ob qho tib si xaim tsis tuaj yeem ntes tam sim no. Tsis tas li ntawd, thaum siv qhov chaw (hlau core) ntawm lub clamp hom ammeter rau kev kuaj pom, qhov kev ua yuam kev me me. Thaum kuaj xyuas lub zog siv ntawm cov khoom siv hauv tsev, siv lub tshuab cais tawm yooj yim dua. Qee cov hlau sib cais tuaj yeem ua kom pom qhov tam sim no los ntawm 10 zaug, Yog li, cov dej ntws hauv qab 1A tuaj yeem ua kom pom tau ua ntej. Thaum siv DC clamp ammeter los kuaj DC tam sim no (DCA), yog tias qhov tam sim no ntws tawm, nws qhia tus lej tsis zoo. Qhov kev ua haujlwm no tuaj yeem siv los txheeb xyuas seb lub tsheb lub roj teeb puas nyob hauv lub sijhawm them lossis tshem tawm
Kev kuaj pom tseeb RMS
Lub clamp hom ammeter nrog qhov nruab nrab tus nqi txoj kev kuaj pom tus nqi nruab nrab ntawm sine yoj los ntawm AC nrhiav pom, thiab qhia tus nqi tom qab amplification los ntawm 1.11 zaug (sine yoj AC) raws li tus nqi zoo. Waveforms thiab distorted nthwv dej nrog sib txawv waveform tus nqi uas tsis yog sine waves kuj tshwm sim tom qab amplification los ntawm 1.11 zaug, uas ua rau qhov qhia yuam kev. Yog li ntawd, thaum kuaj pom waveforms thiab distorted nthwv dej uas tsis yog sine nthwv dej, thov xaiv lub clamp hom ammeter uas tuaj yeem kuaj ncaj qha tus nqi zoo.
Kev kuaj pom dej
Kev kuaj pom muaj qhov sib txawv ntawm qhov kev tshawb pom tam sim no, qhov twg ob (ib theem 2- xov hlau) lossis peb (ib theem 3-hloov hom, peb theem 3- hlau hom) yuav tsum tau yuav clamped ua ke. Nws tseem ua tau kom clamp lub grounding hlau rau kev kuaj. Txoj kev tswj kev rwb thaiv tsev rau kev kuaj xyuas cov xau tam sim no ntawm cov hluav taws xob qis hluav taws xob tau dhau los ua thawj txoj kev txiav txim siab. Txij li thaum nws tau lees paub los ntawm xyoo 1997 kev hloov kho ntawm cov cuab yeej siv hluav taws xob, cov khoom siv hluav taws xob tam sim no tau maj mam siv rau kev sim hauv cov tsev thiab cov chaw tsim khoom uas tsis tuaj yeem siv hluav taws xob.
Yuav ua li cas siv ammeter
1. Rooj sib txuas
Lub ammeter yuav tsum tau txuas nrog nyob rau hauv series nyob rau hauv lub Circuit Court yuav tsum tau kuaj, kom cov tam sim no ntws los ntawm lub "ntxiv" davhlau ya nyob twg ammeter thiab tawm ntawm lub "-" davhlau ya nyob twg. Thaum siv lub ammeter, nws ob lub terminals yuav tsum tsis txhob txuas ncaj qha rau ob tug ncej ntawm lub hwj huam mov, txwv tsis pub lub ammeter yuav hlawv tawm vim tam sim no ntau dhau.
2. Xaiv qhov ntau ntawm lub rooj
Lub ammeter muaj peb lub terminals, raws li qhia hauv daim duab saum toj no. Yog hais tias lub ammeter txuas nrog "plus" thiab "{{0}}.6" terminals, nrog rau ntau yam ntawm 0.6A, nyeem cov txheej txheem ntawm qhov tseem ceeb ntawm thiab hauv qab lub dial; Yog hais tias txuas nrog "ntxiv" thiab "3" terminals, nrog rau ntau yam ntawm 3A, nyeem cov txheej txheem ntawm tus xov tooj. Ua ntej qhov kev sim, yog tias koj tsis paub yuav ua li cas txuas nws, koj tuaj yeem kwv yees tus nqi tam sim no hauv Circuit Court ua ntej. Yog tias qhov kwv yees tam sim no tsawg dua 0.6A, qhov ntau yuav tsum raug xaiv. Yog tias qhov ntsuas tam sim no ntau dua 0.6A tab sis tsawg dua 3A, qhov ntau yuav tsum tau xaiv. Yog tias nws tsis tuaj yeem kwv yees, siv txoj kev sib tham sib tham (kho lub davhlau ya nyob twg thiab nrawm nrawm ntawm lub davhlau ya nyob twg ntawm qhov siab tshaj plaws nrog lwm cov xaim kawg ntawm lub voj voog), thiab tom qab ntawd xaiv qhov tsim nyog raws li lub kaum sab xis ntawm deflection ntawm ammeter. taw tes.
3. Kev sib txuas hauv Circuit Court
Tom qab txuas lub cev daim duab raws li daim duab kos duab, kev sib txuas yuav tsum tau ua. Thaum lub sij hawm mus sib txuas, ua tib zoo saib qhov deflection ntawm ammeter pointer. Yog hais tias tus pointer tsis deflect, nws qhia tau hais tias muaj ib tug Circuit Court tawg nyob rau hauv ib qho chaw; Yog hais tias tus pointer deflects nyob rau hauv lub opposite kev taw qhia, nws qhia tau hais tias qhov zoo thiab tsis zoo terminals ntawm lub 'meter' yog txuas nrog rau qhov opposite direction; Yog tias lub kaum sab xis deflection ntawm tus pointer loj dhau, nws qhia tau tias qhov ntau yog xaiv tsawg dhau; Yog tias lub kaum sab xis deflection ntawm tus pointer me dhau, nws qhia tau tias qhov ntau dhau lawm. Tom qab ntawd, raws li qhov xwm txheej tau pom thaum lub sijhawm sim sib txuas, ua cov kev hloov pauv hloov ua ntej ua qhov kev sim cuam tshuam.
