Cov lus qhia ua haujlwm thiab xya qhov ceev faj rau Multimeters
(1) Paub koj tus kheej nrog lub ntsiab lus ntawm cov cim ntawm lub dial thiab lub luag haujlwm tseem ceeb ntawm cov pob qhov rooj thiab cov keyboards xaiv.
(2) Ua txhua yam zeroing.
(3) Xaiv lub iav thiab ntau yam ntawm kev hloov pauv hloov raws li hom thiab qhov loj me tau ntsuas, thiab nrhiav cov kab sib txuas.
(4) Xaiv qhov chaw ntawm lub qhov (socket) sojntsuam.
(5) Kev ntsuas qhov hluav taws xob: Thaum ntsuas qhov hluav taws xob (lossis tam sim no), nws yog ib qho tseem ceeb uas yuav tsum xaiv qhov tsim nyog. Yog tias ib qho me me siv los ntsuas qhov hluav taws xob siab, muaj kev pheej hmoo ntawm kev kub hnyiab ntawm lub 'meter'; Yog tias siv ntau yam los ntsuas qhov voltages me me, tus pointer deflection yuav tsawg dhau los nyeem. Kev xaiv ntawm kev ntsuas ntau yuav tsum sim deflect tus pointer 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 iav yuav tsum tau xaiv ua ntej, thiab maj mam txo mus rau qhov tsim nyog.
Kev ntsuas ntawm AC voltage: Muab ib qho kev hloov ntawm multimeter nyob rau hauv AC / DC voltage ntau, thiab lwm yam hloov nyob rau hauv qhov tsim nyog ntau yam ntawm AC voltage. Txuas ob lub probes ntawm lub multimeter nyob rau hauv parallel nrog lub xeem Circuit Court los yog load.
Kev ntsuas ntawm DC voltage: Muab ib qho kev hloov ntawm multimeter nyob rau hauv AC / DC voltage ntau, thiab lwm yam hloov nyob rau hauv qhov tsim nyog ntau yam ntawm DC voltage. Txuas lub "+" kev sojntsuam (liab sojntsuam) rau lub peev xwm siab thiab "-" sojntsuam (dub sojntsuam) rau qhov tsis muaj peev xwm, tso cai rau tam sim no ntws los ntawm qhov "+" sojntsuam thiab tawm ntawm qhov "-" sojntsuam. Yog tias qhov kev sojntsuam txuas mus rau qhov sib txawv, tus pointer ntawm lub taub hau ntawm lub 'meter' yuav deflect nyob rau hauv qhov opposite direction, ua rau nws yooj yim rau khoov tus pointer.
(6) Kev ntsuas tam sim no: Thaum ntsuas DC tam sim no, tso ib qho kev hloov ntawm multimeter hauv DC tam sim no ntau yam thiab lwm qhov hloov pauv hauv qhov tsim nyog ntawm 50uA txog 500mA. Txoj kev xaiv thiab kev nyeem ntawv ntawm qhov tam sim no yog tib yam li qhov voltage. Thaum ntsuas, lub Circuit Court yuav tsum raug txiav ua ntej, thiab tom qab ntawd lub multimeter yuav tsum tau txuas nrog hauv series mus rau qhov ntsuas Circuit Court nyob rau hauv cov kev taw qhia ntawm tam sim no los ntawm "+" mus rau "-", uas yog, tam sim no ntws los ntawm lub liab sojntsuam thiab tawm ntawm lub dub sojntsuam. Yog hais tias lub multimeter yog yuam kev nyob rau hauv parallel nrog lub load, nws yuav ua rau ib tug luv luv Circuit Court thiab hlawv tawm lub twj paj nruag vim tsis tshua muaj internal kuj ntawm lub meter taub hau. Txoj kev nyeem ntawv yog raws li hauv qab no: tus nqi tiag tiag =qhia tus nqi x range/full offset
(7) Kev ntsuas tsis kam: Thaum ntsuas qhov tsis kam nrog lub ntsuas ntsuas, cov hauv qab no yuav tsum ua raws:
Mechanical zeroing. Ua ntej siv, lub pointer positioning ntsia hlau yuav tsum tau kho kom xoom qhov kev nyeem ntawv tam sim no kom tsis txhob muaj qhov tsis tsim nyog.
Xaiv cov iav magnification tsim nyog. Qhov ntsuas kab ntawm multimeter's ohm ntau yog qhov tsis sib xws, yog li kev xaiv ntawm qhov kev nthuav dav yuav tsum khaws tus pointer nyob rau hauv lub thinner ib feem ntawm cov nplai kab, thiab qhov ze ntawm tus pointer yog mus rau nruab nrab ntawm qhov ntsuas, qhov kev nyeem ntawv yog ntau dua. Feem ntau, tus pointer yuav tsum muab tso rau ntawm 1/3 thiab 2/3 ntawm qhov ntsuas.
C ohm zeroing. Ua ntej ntsuas qhov kev tiv thaiv, luv luv Circuit Court ob lub probes thiab kho qhov "Ohm (Electrical) Zero Knob" kom lub pointer tsuas yog taw tes rau xoom txoj hauj lwm ntawm sab xis ntawm Ohm scale kab. Yog tias tus pointer tsis tuaj yeem hloov mus rau xoom, nws qhia tau tias lub roj teeb voltage tsis txaus lossis muaj teeb meem sab hauv nrog ntsuas. Thiab txhua zaus lub iav magnification hloov, nws yog ib qho tsim nyog yuav tsum ua Ohmic zeroing dua los xyuas kom meej qhov ntsuas.
D nyeem ntawv: Muab qhov kev nyeem ntawv ntawm lub 'meter' los ntawm qhov sib npaug kom tau txais tus nqi tsis kam ntawm qhov ntsuas qhov ntsuas.
