Yuav ua li cas siv ib tug multimeter los ntes thermistor?
Thermistor feem ntau siv hauv cov khoom siv hluav taws xob tam sim no. Lawv hloov pauv tus nqi tiv thaiv los ntawm kev hloov pauv hauv ib puag ncig qhov kub thiab txias, yog li hloov pauv lub xeev ua haujlwm ntawm Circuit Court. Lawv yog dav siv nyob rau hauv kub sensors thiab tswj systems.
Thermistors tuaj yeem muab faib ua qhov zoo kub coefficient thiab qhov kub tsis zoo coefficient raws li kev sib raug zoo ntawm lawv cov nqi tsis kam thiab kub hloov. Lub npe hu ua qhov zoo kub coefficient yog hais txog qhov txo qis ntawm qhov tsis kam ntawm lub thermistor thaum qhov kub thiab txias nce.
Tus nqi nominal tsis kam ntawm lub thermistor yog hais txog tus nqi tiv thaiv ntawm ib puag ncig ntawm 25 degree. Yog li ntawd, thaum ntsuas tus nqi kuj ntawm lub thermistor, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau qhov cuam tshuam ntawm ib puag ncig kub ntawm nws cov nqi tsis kam. Thaum qhov kub thiab txias yog 25 degree, qhov kev tiv thaiv tus nqi ntawm lub thermistor ntsuas los ntawm multimeter yog nws tus nqi tsis kam. Yog tias qhov ntsuas kub tsis tshaj 25 degree, nws yog qhov tshwm sim ib txwm muaj uas ntsuas qhov ntsuas tsis zoo tsis sib xws rau tus nqi tsis kam ntawm lub thermistor.
Yog tias nws tsim nyog los kuaj xyuas thiab txiav txim seb lub thermistor puas yog qhov ntsuas kub zoo lossis qhov ntsuas kub tsis zoo, lub thermistor tuaj yeem ua kom sov ib puag ncig thaum kuaj xyuas lub thermistor. Yog hais tias ib tug hluav taws xob soldering hlau yog siv los mus rau hauv lub thermistor, yog hais tias qhov ntsuas kuj nce, nws yog ib tug zoo kub coefficient thermistor. Txwv tsis pub, nws yog qhov kub tsis zoo coefficient thermistor.
Yuav ua li cas siv multimeter los txiav txim qhov zoo ntawm capacitors?
Nyob ntawm lub peev xwm ntawm electrolytic capacitor, R ntawm multimeter feem ntau yog xaiv × 10, R × 100, R × 1 K iav rau kev kuaj thiab kev txiav txim. Cov kev sojntsuam liab thiab dub txuas nrog rau qhov zoo thiab qhov tsis zoo ntawm lub capacitor feem (ua ntej txhua qhov kev sim, lub capacitor yuav tsum tau tso tawm), thiab qhov zoo ntawm lub capacitor yog txiav txim los ntawm qhov sib txawv ntawm lub meter koob. Yog tias lub koob saib nrawm nrawm nrawm mus rau sab xis thiab maj mam rov qab mus rau nws qhov chaw qub rau sab laug, lub capacitor feem ntau zoo. Yog tias lub koob saib tsis tig tom qab lub viav vias, nws qhia tias lub capacitor tau tawg lawm. Yog tias lub koob saib maj mam rov qab mus rau ib qho chaw tom qab lub viav vias, nws qhia tau tias lub capacitor tau xau hluav taws xob. Yog tias lub koob saib tsis tuaj yeem ua viav vias, nws qhia tau tias electrolyte ntawm lub capacitor tau qhuav thiab poob nws lub peev xwm.
Nws yog ib qho nyuaj rau kev txiav txim siab qhov zoo ntawm cov capacitors nrog rau kev siv cov txheej txheem saum toj no. Thaum tus nqi hluav taws xob tiv taus ntawm lub capacitor ntau dua li lub roj teeb voltage tus nqi nyob rau hauv multimeter, raws li cov yam ntxwv ntawm lub electrolytic capacitor hais tias cov dej ntws tam sim no me me thaum lub sij hawm them rau pem hauv ntej thiab loj thaum them rov qab, R yuav siv tau × Ntawm 10K iav. , them tus capacitor nyob rau hauv thim rov qab thiab saib seb lub meter koob tseem nyob ruaj khov (piv txwv li seb qhov rov qab xau tam sim no tsis tu ncua), txhawm rau txiav txim siab qhov zoo ntawm lub capacitor nrog cov neeg siab. Cov hlau lead dub txuas nrog rau tus ncej tsis zoo ntawm lub capacitor, thiab cov hlau lead liab txuas nrog rau tus ncej zoo ntawm lub capacitor. Lub koob saib nrawm nrawm nrawm thiab tom qab ntawd maj mam rov qab mus rau qhov chaw yam tsis tau txav mus los, qhia tias lub capacitor zoo. Yog tias lub koob saib tsis ruaj khov ntawm ib qho chaw lossis maj mam txav mus rau sab xis tom qab nres, lub capacitor tau xau hluav taws xob thiab siv tsis tau ntxiv lawm. Lub koob saib feem ntau nyob thiab ruaj khov nyob rau hauv qhov ntsuas ntawm 50-200 K.
