Kev ntsuas ntawm potentiometers thiab capacitors los ntawm multimeter
1. Ntsuas potentiometer.
Potentiometer, tseem hu ua qhov sib txawv ntawm cov resistor, yog hais txog tus resistor uas nws tus nqi kuj tuaj yeem hloov kho dawb hauv qee qhov ntau. Lub nominal tsis kam thiab tsis kam hloov ntawm potentiometer tuaj yeem ntsuas nrog multimeter
(1) Xaiv qhov ntau.
Tig qhov kev xaiv ntau yam hloov mus rau qhov teeb meem hluav taws xob tsim nyog.
(2) Ntsuas qhov nominal tsis kam.
Ntsuas qhov tsis kam ntawm terminals 1 thiab 3 ntawm lub potentiometer, uas yog lub npe tsis kam ntawm potentiometer
Yog tias tus nqi tiv thaiv tsis kawg, nws tuaj yeem txiav txim siab tias lub potentiometer qhib.
(3) Ntsuas qhov kev hloov pauv.
Thaum maj mam tig lub taub hau ntawm lub potentiometer, ntsuas seb qhov kev tiv thaiv qhov tseem ceeb ntawm terminals 1 thiab 2 lossis terminals 2 thiab 3 hloov tsis tu ncua thiab sib npaug. Yog tias nws pom tias tus nqi tsis kam hloov pauv tsis tu ncua lossis muaj qhov tshwm sim dhia, nws tuaj yeem txiav txim siab ua ntej tias muaj teeb meem ntawm qhov tsis sib xws ntawm tus nqi hloov pauv lossis kev sib cuag tsis zoo ntawm potentiometer.
(4) Txiav txim siab hom potentiometer.
Thaum lub potentiometer rotates tusyees, yog hais tias lub deflection ntawm tus pointer ntawm lub multimeter kuj zoo ib yam, nws qhia tau hais tias nws yog ib tug linear potentiometer; qeeb (los yog sai dua), nws qhia txog kev tiv thaiv logarithmic lossis logarithmic potentiometer.
2. Ntsuas lub capacitor nrog multimeter.
Lub capacitor yog ib qho khoom siv uas muaj ob lub phaj hlau sandwiching cov khoom siv insulating (dielectric). Ib tug multimeter tuaj yeem siv rau kev soj ntsuam zoo thiab ib nrab qhov zoo ntawm cov capacitors.
① Xaiv qhov ntau.
Tig qhov kev xaiv ntau yam hloov mus rau qhov teeb meem hluav taws xob tsim nyog (R × 1k lossis R × 10k).
② Ntsuas cov capacitors zoo tib yam.
Thaum ntsuas lub capacitor nrog lub peev xwm loj (siab dua 5000pF), tus pointer ntawm multimeter yuav nrawm nrawm mus rau sab xis thiab maj mam rov qab mus rau sab laug kawg. Thaum tus pointer nres, tus nqi tiv thaiv taw qhia yog lub rwb thaiv tsev tsis kam ntawm lub capacitor. Qhov loj dua cov rwb thaiv tsev tiv thaiv, qhov zoo dua, feem ntau nws yuav tsum nyob ze rau ∞. Thaum ntsuas lub capacitor nrog lub peev xwm me me (hauv qab 5000pF), tus pointer ntawm multimeter yeej tsis txav.
③ Ntsuas cov electrolytic capacitor.
Electrolytic capacitor yog polarized capacitor. Thaum kuaj, txuas qhov tsis zoo electrode ntawm electrolytic capacitor nrog cov hlau kuaj liab, thiab txuas cov electrode zoo nrog cov hlau lead kuaj dub. Qhov loj dua qhov capacitance, qhov ntau dua qhov viav vias ntawm rab koob saib. Tom qab txhua qhov kev ntsuas, ob qhov kawg ntawm lub capacitor yuav tsum luv luv-circuited nrog ib qho kev sim ua kom tso tawm lub capacitor. .
