A. Thaum tus cwj mem kuaj pom seb tus neeg xyuas pib puas yog cov xaim nyob lossis cov xaim nruab nrab, qhov tam sim no los ntawm kev ntsuas tus cwj mem (uas yog, tam sim no los ntawm tib neeg lub cev) I=tag nrho qhov hluav taws xob U siv thoob plaws qhov kev xeem cwj mem thiab tib neeg lub cev, muab faib los ntawm (/ yog sib npaug rau Fractional kab) los ntsuas tag nrho cov tsis kam R hla tus cwj mem thiab tib neeg lub cev.
B. Thaum ntsuas cov hlau nyob, hauv lub teeb pom kev zoo, muaj qhov voltage U=220V nruab nrab ntawm cov hlau nyob thiab hauv av. Kev ua haujlwm ntawm tib neeg lub cev feem ntau me me, feem ntau tsuas yog ob peb puas mus rau ob peb txhiab ohms, thaum lub zog hauv lub cwj mem hluav taws xob feem ntau yog hais txog ntau megohms. Tam sim no ntawm tus cwj mem xeem (uas yog, tam sim no dhau los ntawm tib neeg lub cev) yog qhov me me, feem ntau tsawg dua 1 mA. Thaum xws li ib tug me me tam sim no dhau los ntawm tib neeg lub cev, tsis muaj kev puas tsuaj rau tib neeg, thiab thaum xws li ib tug me me tam sim no hla lub neon npuas ntawm lub xeem cwj mem, neon npuas yuav ci.
C. When measuring the zero line, U=0, I=0, that is, there is no current passing through the neon bulb of the test pen, and the neon bulb does not emit light of course. In this way, we can judge whether the live wire or the neutral wire is based on whether the neon bulb glows.
AC Voltage Tester Pen GD116A :
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