Cov lus qhia siv multimeter
1. Siv multimeter los txiav txim qhov zoo ntawm piezoelectric ceramics
Piezoelectric ceramics yog cov khoom siv hluavtaws piezoelectric. Thaum raug rau sab nraud, cov nqi yuav raug tsim tawm ntawm ob sab, thiab tus nqi ntawm cov nqi yog proportional rau lub siab. Qhov tshwm sim no hu ua piezoelectric effect. Piezoelectric ceramics muaj cov nyhuv piezoelectric, uas yog, lawv yuav deform nyob rau hauv qhov kev txiav txim ntawm ib qho hluav taws xob sab nraud, yog li piezoelectric ceramics tuaj yeem siv los ua suab nrov.
Siv cov nyhuv piezoelectric ntawm daim ntawv piezoelectric ceramic, lub tshuab multimeter tuaj yeem siv los txiav txim seb nws puas zoo lossis phem.
Coj tawm ob lub xov hlau los ntawm ob tug ncej ntawm daim ntawv piezoelectric ceramic, tom qab ntawd muab cov ntawv ceramic tiaj tus rau ntawm lub rooj, txuas ob txoj hlua hlau mus rau ob qhov kev xeem coj ntawm multimeter, tig lub multimeter mus rau qhov tsawg kawg nkaus tam sim no, thiab tom qab ntawd maj mam nias cov ntawv ceramic nrog cov roj hmab taub ntawm tus cwj mem. Yog hais tias lub pointer ntawm lub multimeter swings pom tseeb, nws txhais tau hais tias cov ceramic nti yog lawm, txwv tsis pub, nws txhais tau tias nws puas.
2 Siv lub tshuab ntsuas ntsuas los txiav txim qhov zoo thiab qhov tsis zoo ntawm tus hais lus
Ua ntej, tig lub pointer multimeter mus rau DC 0-5mA iav, thiab tom qab ntawd txuas ob qhov kev xeem coj mus rau ob qhov sib txuas ntawm tus hais lus yuav tsum tau sim. Nias daim ntawv lub khob ntawm tus neeg hais lus maj mam nrog koj txhais tes, thiab saib lub viav vias kev taw qhia ntawm tus pointer ntawm multimeter. Yog tias tus pointer deflects rau pem hauv ntej, cov hlau kuaj liab txuas nrog tus ncej tsis zoo ntawm tus neeg hais lus, thiab cov hlau kuaj dub txuas nrog tus ncej zoo ntawm tus hais lus. Hloov pauv, cov hlau kuaj liab txuas nrog tus ncej zoo, thiab cov hlau kuaj dub txuas nrog cov ncej tsis zoo.
3. Kev tu cov khoom hnyav thiab cov nplais hluav taws xob siv cov khoom siv multimeter
Kev siv digital multimeter 1. Yuav siv li cas
1. Ua ntej siv, ua tib zoo nyeem cov lus qhia muaj feem xyuam, thiab paub txog kev ua haujlwm ntawm lub hwj chim hloov, hloov ntau yam, jack, thiab tshwj xeeb jack.
2. Muab lub hwj huam hloov rau hauv txoj hauj lwm ON.
3. Kev ntsuas ntawm AC thiab DC voltage: Tig qhov hloov pauv mus rau qhov tsim nyog ntawm DCV (direct tam sim no) los yog ACV (alternating tam sim no) raws li qhov yuav tsum tau, ntxig cov hlau kuaj liab rau hauv lub V / Ω qhov, ntxig cov hlau lead dub rau hauv lub COM qhov, thiab txuas cov kev xeem coj mus rau lub Circuit Court nyob rau hauv kev sim nyob rau hauv parallel, kev nyeem ntawv yog tso tawm kom pom.
4. Kev ntsuas ntawm AC thiab DC tam sim no: Tig qhov hloov pauv mus rau qhov tsim nyog ntawm DCA (DC) lossis ACA (AC), ntxig cov hlau kuaj liab rau hauv mA qhov (<200mA) or 10A hole (>200mA), thiab ntxig cov xim dub coj mus rau hauv lub qhov COM, thiab txuas lub multimeter hauv series hauv Circuit Court hauv kev sim
. Thaum ntsuas DC ntws, cov digital multimeter tuaj yeem tso saib qhov polarity.
5. Kev ntsuas qhov tsis kam: Tig qhov hloov pauv mus rau qhov tsim nyog ntawm Ω, ntxig cov hlau kuaj liab rau hauv V / Ω qhov, thiab ntxig cov hmoov txhuas dub rau hauv lub qhov COM. Yog hais tias qhov ntsuas tsis kam tshaj qhov siab tshaj tus nqi ntawm qhov xaiv ntau yam, lub multimeter
Lub 'meter' yuav tso saib "1" thiab ntau dua yuav tsum tau xaiv. Thaum ntsuas qhov tsis kam, cov hlau kuaj liab yog qhov zoo thiab cov hlau kuaj dub yog qhov tsis zoo, uas yog qhov sib txawv ntawm tus pointer multimeter. Yog li ntawd, thaum ntsuas cov polar Cheebtsam xws li transistors thiab electrolytic capacitors, yuav tsum tau them nyiaj mloog mus rau lub
polarity.
