Dab tsi yog qhov sib txawv ntawm lub hauv paus ntsiab lus ntawm kev ntsuas nrog MEGOHMMETER (rwb thaiv tsev testiver) thiab motionalimeter?
Dab tsi yog qhov sib txawv ntawm lub hauv paus ntsiab lus ntawm kev ntsuas nrog MEGOHMMETER (rwb thaiv tsev testiver) thiab motionalimeter?
Ib melohmermeter, tseem hu ua Megger, feem ntau siv los ntsuas cov rwb thaiv tsev tsis kam ntawm cov khoom siv hluav taws xob. Nws muaj AC yog li lub tshuab hluav taws xob, qhov hluav taws xob ob npaug rectifier Circuit Court, lub taub hau meter, thiab lwm yam. Thaum lub Megohmeter yog Cranked, nws ua rau DC voltage. Thaum muaj qee qhov voltage yog thov rau ib qho khoom siv insulating, muaj ib qho tsis txaus ntseeg ntws los ntawm nws, muaj ntawm peb ntu: Capacitive tam sim no, nqus tau tam sim no, thiab dej xau tam sim no. Qhov sib piv ntawm DC voltage generated los ntawm moeghmeter mus rau lub toast tam sim no yog lub rwb thaiv tsev tsis kam. Kuaj seb puas tsim nyog siv cov ntaub ntawv insulating yog hu ua lub rwb thaiv tsev tsis kam ua, uas tuaj yeem ua kom puas, lossis muaj hnub nyoog, yog li muaj kev sib xws. Cov ntsuas ntawm MoGohmmeters suav nrog 250V, 500v, 100V, thiab lwm yam, nrog kev ntsuas muaj ntau xws li 500mω, 1000mω, thiab lwm yam.
Lub rwb thaiv tsev tiv thaiv cov tub luam (tseem hu ua tus kws tshaj lij, megger, lossis 摇表) muaj peb qhov tseem ceeb:
DC siab - voltage generator: siv los tsim cov dc voltage.
Kev ntsuas hluav taws xob.
Cov khoom noj.
(1) DC High -} voltage generator
Kev Ntsuas Rwb Thaiv Tsev Kuj yuav tsum tau thov qhov hluav taws xob ntau ntawm cov chaw ntsuas kev ntsuas. According to national standards for insulation resistance meters, this high voltage is specified as 50V, 100V, 250V, 500V, 1000V, 2500V, 5000V, etc. There are three common methods to generate DC high voltage:
Tes -} cranked generator: siv nyob rau hauv kwv yees li 80% ntawm MoGohmmeters tsim nyob rau hauv Suav teb (Keeb kwm ntawm lub sij hawm "摇表" lossis "Crank Meter").
Mains -} Powered Transformer Kauj Ruam-}}}}- Powered MoGohmmeters.
Kev Ntsuas Hluav Taws Xob Oscillation lossis Disticated mem tes Dav Hlau Tes Haujlwm (PWM) Circuits: Siv rau roj teeb {{}} powered rwb thaiv tsev rwb thaiv tsev.
