Cov lus xaus ntawm kev siv digital multimeters
(1) Paub koj tus kheej nrog qhov tseem ceeb ntawm cov cim ntawm lub dial thiab lub luag haujlwm tseem ceeb ntawm txhua lub pob qhov rooj thiab qhov chaw xaiv.
(2) Ua txhua yam zeroing.
(3) Xaiv qhov nres thiab qhov ntau ntawm qhov hloov pauv hloov raws li hom thiab qhov loj ntawm qhov ntsuas yuav tsum tau ua thiab nrhiav kom paub qhov sib thooj.
(4) Xaiv txoj hauj lwm ntawm lub ntsuas mem jack.
(5) Kev ntsuas qhov ntsuas hluav taws xob: xaiv qhov zoo thaum ntsuas qhov ntsuas hluav taws xob (lossis tam sim no), yog tias koj siv ntau yam me me los ntsuas qhov hluav taws xob loj, muaj qhov txaus ntshai ntawm qhov ntsuas hluav taws xob; Yog tias koj siv ntau qhov loj los ntsuas qhov voltage me me, ces tus pointer deflection yog qhov tsawg dhau los nyeem. Kev xaiv ntau yam yuav tsum sim ua kom tus pointer deflection mus txog 2/3 ntawm tag nrho cov nplai. Yog hais tias qhov loj ntawm qhov ntsuas voltage tsis meej ua ntej, qhov siab tshaj plaws yuav tsum tau xaiv ua ntej, thiab maj mam txo mus rau qhov tsim nyog.
Kev ntsuas hluav taws xob AC: kev hloov pauv ntawm lub multimeter tau muab tso rau hauv AC thiab DC voltage thaiv, lwm qhov kev hloov pauv hloov tau muab tso rau hauv qhov tsim nyog ntawm AC voltage, ob lub cwj mem ntawm multimeter thiab ntsuas Circuit Court lossis load tuaj yeem txuas nrog. thaum uas tig mus.
b DC voltage ntsuas: kev hloov pauv ntawm multimeter yog muab tso rau hauv AC thiab DC voltage thaiv, thiab lwm qhov hloov pauv hloov tau muab tso rau hauv qhov tsim nyog ntawm DC voltage, thiab "+" cwj mem (liab cwj mem) txuas nrog lub peev xwm siab. , "-" cwj mem (dub cwj mem) txuas nrog lub peev xwm qis, piv txwv li, cia cov tam sim no ntws los ntawm AC voltage mus rau DC voltage. Muaj peev xwm, uas yog, cia tam sim no los ntawm tus cwj mem "+" mus rau, los ntawm tus cwj mem "-" tawm. Yog tias tus cwj mem txuas nrog rau qhov sib txawv, tus pointer yuav raug deflected nyob rau hauv qhov opposite direction, yooj yim rau khoov tus pointer.
(6) Kev ntsuas tam sim no: thaum ntsuas DC tam sim no, qhov hloov pauv ntawm lub ntsuas hluav taws xob yuav muab tso rau hauv DC tam sim no thaiv, thiab lwm qhov kev hloov pauv yuav muab tso rau hauv qhov tsim nyog ntawm 50uA txog 500mA, thiab ntau yam xaiv thiab nyeem txoj kev ntawm tam sim no yog tib yam li qhov voltage. Kev ntsuas yuav tsum raug txiav tawm ntawm lub voj voog, thiab tom qab ntawd raws li qhov tam sim no los ntawm "+" mus rau "-" kev taw qhia, lub multimeter txuas nrog hauv series rau hauv Circuit Court nyob rau hauv kev sim, uas yog, tam sim no ntws los ntawm tus cwj mem liab, los ntawm lub tus cwj mem dub tawm. Yog hais tias lub multimeter yog yuam kev nyob rau hauv parallel nrog lub load, lub internal kuj ntawm lub meter taub hau yog heev me me, uas yuav ua rau ib tug luv luv Circuit Court thiab hlawv lub ntsuas. Txoj kev nyeem ntawv yog raws li hauv qab no: tus nqi tiag tiag=qhov taw qhia tus nqi × ntau yam / tag nrho kev tsis ncaj ncees
(7) Kev ntsuas qhov tsis kam: Thaum ntsuas qhov tsis kam nrog lub multimeter, nws yuav tsum tau ua raws li cov hauv qab no:
a Xaiv qhov tsim nyog magnification thaiv. Qhov ntsuas ntawm ohmmeter block ntawm lub multimeter yog tsis sib npaug, yog li ntawd yuav tsum tau xaiv lub multiplier block kom lub pointer nyob twj ywm nyob rau hauv lub thinner ib feem ntawm lub teev raws li qhov tsim nyog, thiab qhov ze ntawm lub pointer yog nyob rau hauv nruab nrab ntawm lub teev, qhov tseeb dua. kev nyeem ntawv yog. Feem ntau, tus pointer yuav tsum tau ua kom taw tes rau hauv qhov ntsuas ntawm 1/3 txog 2/3.
b ohm ua. Kev ntsuas kev tiv thaiv ua ntej ob lub cwj mem yuav tsum luv luv, thiab tib lub sijhawm kho qhov "ohm (hluav taws xob) xoom pob qhov rooj", kom tus pointer tsuas yog taw tes ntawm xoom txoj haujlwm ntawm sab xis ntawm ohm nplai. Yog tias tus pointer tsis tuaj yeem hloov mus rau xoom, nws txhais tau hais tias lub roj teeb voltage tsis txaus lossis muaj teeb meem hauv qhov ntsuas. Thiab txhua zaus koj hloov qhov thaiv qhov sib npaug, koj yuav tsum ua qhov kev hloov kho ohm xoom dua kom ntseeg tau tias qhov ntsuas tau raug.
c Kev nyeem ntawv: kev nyeem ntawv ntawm lub taub hau ntawm lub 'meter' sib npaug los ntawm qhov sib npaug ntawm qhov sib npaug yog tus nqi tsis kam ntawm qhov ntsuas qhov ntsuas.
(8) Kev ntsuas ntawm transformers: ntsuas ntawm transformers thiab ntsuas ntawm inductance nrog ntau yam. Ua ntej qhia lub transformer, transformer los ntawm thawj winding, theem nrab winding thiab core. Muaj ob hom kev hloov pauv hloov pauv thiab cov kauj ruam-down. Thawj winding feem ntau yog txuas nrog lub hwj huam mov, yog tias koj xav ntsuas thawj winding ntawm lub transformer ntawm TV ntawm ob lub cwj mem ntawm multimeter txuas nrog ob kawg ntawm lub ntsaws ntawm kab, hloov mus rau ohm iav, ncaj qha txuas nrog lub qhov (socket), qhov tsis kam yuav tsum yog me me ntawm cov lus piav qhia yog qhov zoo. Txuas nrog lub hwj chim mov yog thawj winding ces lwm kawg yog lub thib ob winding. Kev ntsuas kuj tseem zoo ib yam li thawj tus cwj mem txuas nrog ob lub terminals ntawm ob lub voj voog thib ob tuaj yeem ntsuas tau, qhov kev tiv thaiv tus nqi ntawm qhov thib ob winding yuav loj heev.
