Yuav Ua Li Cas Nyeem CAT Multimeter Rating: Nkag siab thiab siv los ntsuas qhov siab tshaj plaws
Txheem
Multimeters thiab lwm yam khoom siv ntsuas hluav taws xob feem ntau tau muab rau qeb ntsuas. Qhov no yog muab rau tus neeg siv lub tswv yim ntawm qhov siab tshaj plaws voltage lub cuab yeej tuaj yeem ntsuas kev nyab xeeb. Cov kev ntsuas no tau nthuav tawm raws li CAT I, CAT II, CAT III, lossis CAT IV. Txhua qhov ntsuas qhia qhov siab tshaj plaws muaj kev nyab xeeb voltage los ntsuas.
Qhov ntsuas CAT ntawm multimeter yog dab tsi?
Qeb Kev Ntsuas (CAT) yog ib qho kev siv los ntawm cov tuam txhab lag luam los txiav txim siab qib kev tiv thaiv los ntawm cov khoom siv hluav taws xob thaum ntsuas qhov hluav taws xob. Kev ntsuam xyuas muaj txij li CAT I mus rau CAT IV nyob ntawm seb hom voltage raug ntsuas.
Thaum twg kuv yuav tsum siv lub ntsuas ntsuas sib txawv? Cov lus teb yog nyob ntawm txoj haujlwm ua tiav.
Multimeters feem ntau yog siv hauv cov khoom siv hluav taws xob thiab hluav taws xob tsawg. Piv txwv li, ntsuas qhov hluav taws xob lossis ntsuas qhov muag teeb. Hauv cov xwm txheej no, CAT I lossis CAT II meters yuav txaus. Txawm li cas los xij, thaum ua haujlwm hauv qhov chaw muaj hluav taws xob ntau dua, xws li lub tshuab hluav taws xob hluav taws xob, koj yuav xav tau kev tiv thaiv hluav taws xob ntxiv dua li qhov ntsuas tus qauv tuaj yeem muab tau. Ntawm no koj tuaj yeem txiav txim siab siv tus tshiab, siab dua cov ntsuas multimeter.
Cov pawg sib txawv thiab lawv cov lus txhais
Thaum sim ntsuas qhov load, muaj 4 qhov lees txais kev ntsuas.
CAT kuv: Qhov no feem ntau yog siv nyob rau hauv metering circuits uas ncaj qha mus rau lub tsev cov hluav taws xob thaiv qhov system. Piv txwv muaj xws li cov khoom uas tsis yog tam sim no-nqa xws li teeb, keyboards, Circuit Court breakers, thiab lwm yam. Hluav taws xob shock yog tsis zoo los yog tsis yooj yim sua nyob rau hauv tej yam kev mob.
TXOJ CAI XNUMX: Pawg no yog siv nyob rau hauv ib puag ncig uas cov transients tsuas yog me ntsis siab dua li qub voltage. Piv txwv xws li cov qhov (sockets), keyboards, junction boxes, thiab lwm yam. Cov hluav taws xob poob siab tsis zoo los yog tsis zoo li tshwm sim hauv cov cheeb tsam no.
CAT III: Cov pawg no yog siv rau kev ntsuas los ze rau lub zog, xws li ntawm cov khoom siv hluav taws xob thiab cov keyboards hauv cov tsev lossis cov chaw tsim khoom. Hluav taws xob poob siab tsis zoo nyob rau hauv cov xwm txheej no. Txawm li cas los xij, lawv tuaj yeem tshwm sim nrog qhov tshwm sim tsawg vim yog qhov ua tsis tau zoo. (1)
Qeb IV: Cov cuab yeej muaj nyob rau hauv pawg no yog siv rau ntawm thawj sab ntawm ib qho kev sib cais transformer nrog cov rwb thaiv tsev muaj zog thiab rau kev ntsuas ntawm cov kab hluav taws xob nyob sab nraum cov tsev (cov kab hluav taws xob, cov kab hluav taws xob).
Lub International Electrotechnical Commission (IEC) tau tsim plaub theem ntawm lub zog hluav taws xob thiab hlau nplaum nrog cov lus pom zoo rau kev sim rau txhua tus.
| nta | CAT I | CAT II | MIV III | TXOJ CAI XNUMX |
| Ua haujlwm voltage | 150V | 150V | 150V | 150V |
| 300V | 300V | 300V | 300V | |
| 600V | 600V | 600V | 600V | |
| 1000V | 1000V | 1000V | 1000V | |
| Transient voltage | 800V | 1500V | 2500V | 4000V |
| 1500V | 2500V | 4000V | 6000V | |
| 2500V | 4000V | 6000V | 8000V | |
| 4000V | 6000V | 8000V | 12000V | |
| Test qhov chaw (impedance) | 30 ohm | 12 ohm | 2 ohm | 2 ohm |
| 30 ohm | 12 ohm | 2 ohm | 2 ohm | |
| 30 ohm | 12 ohm | 2 ohm | 2 ohm | |
| 30 ohm | 12 ohm | 2 ohm | 2 ohm | |
| Ua haujlwm tam sim no | 5A | 12.5A | 75A | 75A |
| 10A | 25A | 150A | 150A | |
| 20A | 50A | 300A | 300A | |
| 33.3A | 83.3A | 500A | 500A | |
| Hloov tam sim no | 26.6A | 125A | 1250A | 2000A |
| 50A | 208.3A | 2000A | 3000A | |
| 83.3A | 333.3A | 3000A | 4000A | |
| 133.3A | 500A | 4000A | 6000A |
CAT multimeter ntsuas qhov system ua haujlwm li cas
Feem ntau siv multimeters hauv khw poob rau hauv ob pawg: CAT I thiab CAT III. CAT I multimeter yog siv los ntsuas qhov voltage mus txog 600V, thaum CAT III multimeter yog siv mus txog 1000V. Txhua yam saum toj no uas yuav tsum tau muaj qib siab dua, xws li CAT II thiab IV, tsim rau 10,000V thiab 20,000V raws li.
Ib qho piv txwv ntawm kev siv CAT multimeter ntsuas qhov system
Xav txog tias koj tab tom saib lub vaj huam sib luag hluav taws xob ntawm koj lub tsev. Koj yuav tsum tau kuaj xyuas ntau cov xov hlau. Cov xov hlau txuas ncaj qha mus rau cov kab hluav taws xob loj (240 Volts). Kov lawv los ntawm kev yuam kev tuaj yeem ua rau raug mob lossis tuag. Txhawm rau ntsuas qhov ntsuas no kom nyab xeeb, koj yuav xav tau ntau dua qib multimeter (CAT II lossis zoo dua) uas yuav tiv thaiv koj thiab koj cov cuab yeej los ntawm kev puas tsuaj los ntawm qib siab zog. (2)
Ua tib zoo saib qee qhov ntawm peb cov lus hauv qab no.
- Yuav ua li cas ntsuas DC voltage nrog multimeter
- Yuav ua li cas siv ib tug multimeter los xyuas qhov voltage ntawm nyob ntawm tej
- Yuav ua li cas ntsuas amps nrog multimeter
tswv yim pom zoo
(1) industrial chaw - https://www.sciencedirect.com/topics/social-sciences/industrial-facilities
(2) qib zog - https://www.sciencedirect.com/topics/earth-and-planetary-sciences/energy-levels
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