Kawm txog cov teeb meem tshwm sim thaum siv multimeter
Ib hom yog tshwm sim los ntawm peb cov kev ua haujlwm yuam kev, xws li kev sib txuas ntawm ib qho multimeter mus rau ob qho kawg ntawm lub voj voog raug ntsuas hauv kev ntsuas tam sim no, tsis ua hauj lwm txiav tawm lub hwj chim thaum ntsuas kev tiv thaiv, thiab lwm yam.
Txoj kev txuas kom raug rau kev ntsuas multimeter:
Nyob rau hauv daim duab 1, lub multimeter yog txuas nrog nyob rau hauv parallel nrog cov tshuaj ntsuam xyuas, thiab lub multimeter plays ib tug shunt lub luag hauj lwm, yuav tsum tau ib tug siab nyob rau hauv lub multimeter. Nyob rau hauv daim duab 2, lub multimeter yog txuas nrog nyob rau hauv series nrog lub xeem ntaus ntawv los faib cov voltage, thiab nws yuav tsum tau hais tias lub internal kuj ntawm lub multimeter yog me me. Thaum txuas tsis raug, xws li hauv kev sim tam sim no, multimeter tau muab tso rau ntawm ob qho kawg ntawm cov cuab yeej kuaj. Lub Circuit Court uas lub multimeter nyob yog luv luv Circuit Court vim tsis tshua muaj kev tiv thaiv ntawm lub Circuit Court, uas tej zaum yuav tshwm sim los ntawm ib tug tshuab fuse, ua rau muaj kev phom sij.
Lwm hom yog qhov muaj feem xyuam rau kev nyab xeeb, xws li hluav taws xob poob siab los ntawm kev sib cuag nrog cov khoom nyob, qhov hluav taws xob hloov pauv tau tshwm sim los ntawm kev hloov thiab thauj khoom pib- nce, thiab lwm yam. Nrog rau qhov nyuaj ntawm cov hluav taws xob faib hluav taws xob thiab kev thauj khoom, qhov muaj peev xwm ntawm instantaneous overvoltage tau nce zoo heev. Cov motors, capacitors, fais fab converters, zaus converters, thiab lwm yam khoom siv yog lub ntsiab ntawm spikes. Tsis tas li ntawd, xob laim tawm ntawm cov kab sib txuas sab nraum zoov tuaj yeem ua rau muaj kev phom sij heev - lub zog hloov hluav taws xob siab. Thaum ntsuas lub zog hluav taws xob, qhov hluav taws xob tam sim no feem ntau pom tsis pom, tab sis nws muaj nyob thiab tsis yooj yim kom zam, thiab nws qhov kev phom sij tseem ceeb dua. Cov xwm txheej no feem ntau ntsib txawm tias nyob rau hauv qis - qhov ntsuas hluav taws xob, thiab qhov hluav taws xob tam sim no tuaj yeem ncav cuag ntau txhiab volts lossis siab dua. Yog li ntawd, thaum ua haujlwm multimeter, nws tsis yog tsuas yog yuav tsum tau them sai sai rau kev kho cov xaim kom tsis txhob muaj kev phom sij lossis kev puas tsuaj, tab sis kuj yuav tsum tsis txhob muaj kev phom sij los ntawm qee qhov kev tsim kev nyab xeeb.
Yog li dab tsi yog qhov kev tiv thaiv kev nyab xeeb tsim rau multimeters?
Thawj hom yog kev tiv thaiv sab nraud rau multimeters, xws li ob npaug - txheej txheej rwb thaiv tsev tiv thaiv npog, kev sojntsuam tiv thaiv kev tiv thaiv, thiab kev tiv thaiv rwb thaiv tsev rau cov ntsaws thiab cov qhov (sockets). Tab sis kom tsis txhob muaj teeb meem tshwm sim los ntawm lub sijhawm muaj hluav taws xob siab, kev nyab xeeb yuav tsum tau sib xyaw ua ke rau hauv digital multimeter, nyob rau hauv lwm yam lus, yuav tsum muaj kev ruaj ntseg txaus tsim nyob rau hauv lub digital multimeter. Yog li ntawd, International Electrotechnical Commission (IEC) tau txhais cov txheej txheem tshiab kev nyab xeeb thoob ntiaj teb tshwj xeeb rau cov cuab yeej ntsuas. Yav dhau los, tus qauv IEC348 tau siv, tab sis tam sim no nws tau hloov los ntawm IECl010. Cov ntsuas kev nyab xeeb ntawm multimeter tsim raws li tus qauv tshiab IECl010 ntau dua li cov tsim raws li IEC348.
Cia peb nkag siab ua ntej IEC1010 cov txheej txheem kuaj, uas suav nrog peb yam tseem ceeb: ruaj khov voltage, siab tshaj qhov hluav taws xob, thiab qhov chaw impedance.
