Yuav ntsuas li cas siv Ohm Range ntawm Digital Multimeter
Thermocouple yog ib qho kev ntsuas kub uas feem ntau siv hauv cov ntsuas kub. Nws ncaj qha ntsuas qhov kub thiab txias thiab hloov cov teeb liab kub rau hauv lub teeb liab muaj peev xwm thermoelectric, uas tom qab ntawd hloov mus rau qhov ntsuas kub ntawm qhov nruab nrab ntsuas los ntawm cov cuab yeej hluav taws xob (cov cuab yeej thib ob). Cov tsos ntawm ntau yam thermocouples feem ntau txawv heev vim lawv cov kev xav tau, tab sis lawv cov qauv yooj yim yog tib yam. Lawv feem ntau yog tsim los ntawm cov khoom tseem ceeb xws li cov hluav taws xob kub, lub tsho tiv thaiv, thiab cov thawv sib txuas, thiab feem ntau yog siv ua ke nrog cov khoom siv, cov cuab yeej kaw, thiab cov khoom siv hluav taws xob.
Txoj kev siv multimeter los xyuas qhov zoo ntawm thermocouples
1. Ua ntej siv multimeter rau kev sim, peb thawj zaug saib nrog lub qhov muag liab qab seb lub raj tiv thaiv puas yog corroded, nkag mus, los yog to. Tom qab ntawd siv lub multimeter los ntsuas qhov txuas ntxiv. Qhov tsis kam ntawm cov thermocouple sib sau ua ke feem ntau tsis ntau dua 2 ohms, thiab qhov tsis kam ntawm lub network cable feem ntau tsis ntau dua 50 ohms. Feem ntau, yog tias nws loj dua 1K, nws tuaj yeem txiav txim siab tias nws tawg.
2. Ntsuas tus nqi tsis kam nrog lub multimeter, thiab yog tias qhov kev tiv thaiv siab tshaj 100K, nws raug suav hais tias yog qhov yuam kev.
3. Siv lub multimeter ohmmeter los ntsuas lub thermocouple, kho qhov tsis kam, txuas ob qhov kawg, thiab siv lub teeb kom sov me ntsis. Yog hais tias lub multimeter pointer ho nce los yog txo, nws qhia tau hais tias nws yog zoo. Yog tias tus pointer tsis txav, nws qhia tau tias nws twb tawg lawm. Koj tuaj yeem siv multimeter los ntsuas qhov voltage ntawm ob qhov kawg hauv millivolt ntau. Yog tias tsis muaj qhov hluav taws xob, nws yuav ua haujlwm tsis zoo.
Feem ntau faults thiab tu txoj kev ntawm multimeters
1. Lub pointer viav vias txawv txav, nrog kev sib tshuam oscillation thiab tsis kam
Kev daws:
(1) Qhib cov ntaub ntawv saib thiab siv cov tweezers thiab lub hau ntswj los kho cov tshuab viav vias, ua tus taw tes viav vias yooj yim;
(2) Re welded lub header hlau, reconnect lub shunt resistor thaum nws yog disconnected, thiab hloov nws nrog ib tug shunt resistor ntawm tib tus qauv thaum nws hlawv tawm;
(3) Siv cov tweezers los kho cov duab ntawm lub caij nplooj ntoos hlav tshuav, ua rau nws lub nplhaib sab nrauv du thiab sib npaug;
(4) Kho cov khoom txhawb nqa
2. Tsis muaj kev qhia hauv hom kev tiv thaiv
(1) Reinstall lub multimeter roj teeb los yog hloov nrog ib tug tshiab;
(2) Re weld qhov kev sib txuas thiab kho qhov chaw sib cuag ntawm potentiometer kom ntseeg tau tias kev sib cuag zoo nrog cov hlau tsis kam;
(3) Ntxuav cov roj stains ntawm cov ntsiab lus tiv tauj thiab kho cov ntaub ntawv tiv tauj. Yog hais tias lub welding kev twb kev txuas hlau yog disconnected, nws yuav tsum tau rov welded;
