Dab tsi yog qhov txawv ntawm lub hauv paus ntsiab lus ntawm kev ntsuas kev tiv thaiv nrog lub rooj sib tsoo thiab multimeter
Dab tsi yog qhov sib txawv ntawm lub hauv paus ntsiab lus ntawm kev ntsuas kev tiv thaiv nrog lub rooj tuav thiab ntsuas kev tiv thaiv nrog multimeter
Lub tramegger, tseem hu ua megohmmeter, feem ntau yog siv los ntsuas qhov rwb thaiv tsev ntawm cov khoom siv hluav taws xob. Nws yog tsim los ntawm cov khoom xws li AC generator voltage ob npaug ntawm rectifier Circuit Court thiab lub taub hau meter. Thaum lub rooj co co co, ib tug DC voltage yog generated. Thaum muaj qee qhov hluav taws xob raug siv rau cov khoom siv rwb thaiv tsev, qhov tsis muaj zog tam sim no yuav ntws los ntawm cov khoom siv rwb thaiv tsev, uas muaj peb ntu: capacitive tam sim no, nqus tam sim no, thiab cov xau tam sim no. Qhov piv ntawm DC voltage generated los ntawm lub rooj co rau lub to tam sim no yog lub rwb thaiv tsev tsis kam. Qhov kev sim ntawm kev siv lub rooj sib txhuam los xyuas seb cov khoom siv rwb thaiv tsev puas tsim nyog yog hu ua kev ntsuas kev tiv thaiv hluav taws xob. Nws tuaj yeem tshawb xyuas seb cov khoom siv rwb thaiv tsev puas ntub, puas, lossis hnub nyoog, thiab yog li pom cov khoom siv tsis raug. Qhov ntsuas hluav taws xob ntawm lub megohmmeter suav nrog ntau hom xws li 250, 500, 1000, thiab 2500V, thiab qhov ntsuas ntsuas muaj ntau hom xws li 500, 1000, thiab 2000M Ω
Rwb thaiv tsev tiv thaiv tester, tseem hu ua megohmmeter, shake meter, lossis Megger meter. Lub rwb thaiv tsev ntsuas ntsuas feem ntau muaj peb ntu. Thawj yog DC high voltage generator, uas yog siv los tsim DC high voltage. Qhov thib ob yog qhov ntsuas Circuit Court. Qhov thib peb yog zaub.
(1) DC high-voltage generator
Txhawm rau ntsuas kev tiv thaiv kev tiv thaiv hluav taws xob, qhov hluav taws xob siab yuav tsum tau siv rau ntawm qhov ntsuas qhov kawg, uas tau teev tseg hauv lub teb chaws tus qauv ntawm cov ntsuas hluav taws xob tiv thaiv hluav taws xob xws li 50V, 100V, 250V, 500V, 1000V, 2500V, 5000V
Feem ntau muaj peb txoj hauv kev los tsim DC high voltage ** Hom tes cranked generator. Tam sim no, kwv yees li 80% ntawm cov megohmmeters uas tsim nyob rau hauv Suav teb siv txoj kev no (lub npe ntawm lub rooj co los ntawm) ** Txoj kev yog los txhawb qhov voltage los ntawm lub mains transformer thiab kho nws kom tau txais DC voltage siab. Cov txheej txheem feem ntau siv rau kev lag luam megohmmeters. Qhov thib peb txoj kev yog siv transistor oscillation los yog tshwj xeeb mem tes dav modulation circuits los tsim DC high voltage, uas yog feem ntau siv nyob rau hauv roj teeb thiab mains rwb thaiv tsev ntsuas ntsuas.
(2) Kev ntsuas Circuit Court
Kev sib koom ua ke ntawm kev ntsuas Circuit Court thiab tso saib ib feem hauv megohmmeter tau hais ua ntej. Nws tau ua tiav los ntawm qhov piv txwv tam sim no lub taub hau, uas muaj ob lub coils nrog lub kaum sab xis ntawm 6 0 degree . Ib lub kauj yog sib npaug mus rau qhov hluav taws xob ntawm ob qho kawg, thiab lwm lub kauj yog nyob rau hauv series hauv kev ntsuas Circuit Court. Lub kaum sab xis ntawm lub pointer ntawm lub taub hau 'meter' yog txiav txim siab los ntawm qhov sib piv tam sim no ntawm ob lub coils. Txawv deflection angles sawv cev txawv qhov tseem ceeb. Qhov me me ntawm qhov ntsuas tsis kam, qhov ntau dua qhov coil tam sim no nyob rau hauv kev ntsuas Circuit Court, thiab ntau dua qhov deflection kaum ntawm tus pointer. Lwm txoj hauv kev yog siv linear ammeter rau kev ntsuas thiab tso saib. Hauv qhov piv txwv tam sim no lub taub hau siv ua ntej, vim yog qhov tsis sib xws ntawm cov hlau nplaum hauv lub kauj, thaum lub pointer nyob rau hauv infinity, lub kauj tam sim no tshwm sim nyob rau ntawm qhov chaw uas sib nqus flux ntom * muaj zog. Yog li ntawd, txawm hais tias qhov ntsuas tsis kam yog qhov loj, qhov tam sim no ntws los ntawm lub kauj tam sim no me me, thiab lub kaum sab xis ntawm lub kauj yuav loj heev. Thaum ntsuas qhov ntsuas me me los yog 0, qhov tam sim no ntws los ntawm lub kauj tam sim no loj, thiab lub kauj tau deflected mus rau qhov chaw nrog qis sib nqus flux ntom, uas ua rau lub kaum sab xis me me. Qhov no ua tiav kev kho tsis-linear. Tus nqi tsis kam tso tawm ntawm lub taub hau ntawm ib qho megohmmeter ib txwm xav tau kom ncua ntau qhov kev txiav txim ntawm qhov loj. Tab sis thaum siv lub linear ammeter ncaj qha txuas nrog hauv series mus rau qhov ntsuas Circuit Court, nws tsis tuaj yeem ua tau. Ntawm qhov tseem ceeb ntawm kev tiv thaiv siab, cov nplai tag nrho yog sib xyaw ua ke thiab tsis tuaj yeem sib txawv. Txhawm rau kom ua tiav qhov kev kho tsis raug, cov khoom tsis sib xws yuav tsum tau ntxiv rau qhov ntsuas ntsuas ntsuas. Yog li ua tiav cov nyhuv shunt ntawm cov nqi qis tsis kam. Thaum muaj kev tiv thaiv siab tshwm sim, tsis muaj shunt, uas ua rau cov nqi tiv thaiv mus txog ntau qhov kev txiav txim ntawm qhov loj.
