Digital megohmmeter Circuit Court thiab converter muaj nuj nqi
Cov megohmmeters feem ntau siv DC voltage converter los hloov lub roj teeb voltage rau DC high voltage raws li qhov ntsuas voltage. Tam sim no tsim los ntawm kev siv qhov ntsuas hluav taws xob no rau cov khoom nyob rau hauv kev sim yog hloov mus rau hauv tus nqi hluav taws xob sib thooj los ntawm qhov tam sim no-voltage converter, thiab xa mus rau lub ntsuas. Tom qab nkag mus rau lub analog-rau-digital converter, nws dhau los ua tus lej digital, uas tom qab ntawd suav thiab ua tiav los ntawm microprocessor, thiab cov nqi sib thooj tau tshwm sim ntawm cov zaub.
1. DC voltage converter
Lub DC voltage converter (DC-DC converter) converts lub roj teeb voltage rau hauv siab DC voltage raws li qhov ntsuas voltage. Nws yog ib feem tseem ceeb ntawm cov digital megger. Muaj peb qhov kev ntsuas voltages ntawm 250V, 500V, thiab 1000V (tseem muaj 2500V, 5000V, thiab lwm yam.
Cov megohmmeters feem ntau siv pulse width modulation (PWM) hloov hluav taws xob sib xyaw ua ke los hloov DC voltage ntawm lub roj teeb rau hauv lub teeb liab pulse width modulation, uas tau hloov mus rau hauv high voltage pulses los ntawm kev hloov pauv theem thiab kho los ntawm qhov voltage doubler. (ob npaug los yog triple) yog smoothed rau hauv DC high-voltage test voltage, thiab nws cov zis voltage yog tiav los ntawm kev kho cov mem tes dav los ntawm cov zis voltage tswj Circuit Court.
Cov maub los xws li UC3840, TL494, SG3524, thiab lwm yam. Hom pulse width modulation maub los no yog qhov nrov tshaj plaws kev sib txuas hluav taws xob hloov hluav taws xob tswj hauv ntiaj teb. Nws suav nrog tag nrho cov tswj Circuit Court uas xav tau rau kev hloov regulators. Piv txwv li, yuam kev amplifier, oscillator, mem tes dav modulator, mem tes generator, switching tube, overcurrent thiab overheating tiv thaiv, thiab lwm yam.
2. Tam sim no rau voltage converter
Lub tam sim no-rau-voltage converter (IV hloov dua siab tshiab) muaj cov resistor yuav tsum tau ntsuas Rx, lub tswv yim resistor Rf thiab lub lag luam amplifier A1. Nws hloov cov tam sim no ntws los ntawm kev ntsuas rwb thaiv tsev tiv thaiv Rx rau hauv qhov hluav taws xob hluav taws xob tso zis.
3. Analog-rau-digital converter thiab tso saib Circuit Court
Analog-to-digital converter (A/D) yog qhov sib txuas ntawm analog circuits thiab digital circuits, thiab tseem yog ib qho tseem ceeb ntawm cov cuab yeej analog thiab cov twj paj nruag digital. Digital megohmmeters nrog qhov tseeb tsis ntau tshaj 1% feem ntau yog siv ICL7106 (los yog ICL7107) loj-scale integrated circuit. ICL7106 yog tus lej 3?-tus lej ob qhov kev sib koom ua ke A / D converter nrog LCD zaub (ICL7107 yog LED zaub), siv nws cov tswv yim Cov yam ntxwv ntawm qhov voltage thiab qhov siv hluav taws xob tau yooj yim ntsuas tus nqi tsis kam.
