Dab tsi txhua tus lej ntawm digital multimeter txhais tau tias
Lub fuse resistor yog ib qho tshwj xeeb uas muaj ob lub zog ntawm lub resistor thiab fuse. Nws yog sawv cev los ntawm tsab ntawv "RF" lossis "R" hauv Circuit Court.
Xaiv cov fuse resistors
Thaum xaiv, nws qhov kev ua tau zoo dua yuav tsum raug txiav txim siab, thiab qhov tsis xws li nws qhov kev tiv thaiv tus nqi thiab lub zog yuav tsum raug xaiv raws li cov kev cai tshwj xeeb ntawm Circuit Court. Nws yog ib qho tsim nyog los xyuas kom meej tias nws muaj peev xwm fuse sai thaum nws overloaded, thiab nws yuav tsum tau xyuas kom meej tias nws tuaj yeem ua haujlwm ruaj khov rau lub sijhawm ntev nyob rau hauv ib txwm muaj. Yog tias tus nqi tiv thaiv loj dhau los yog lub zog loj dhau, tsis tuaj yeem ua lub luag haujlwm tiv thaiv.
Kev ntsuas txoj kev nrog multimeter rau kev kuaj pom ntawm fuse resistor
Hauv Circuit Court, thaum lub fuse raug txiav, kev txiav txim siab tuaj yeem ua raws li cov kev paub dhau los: yog tias qhov chaw ntawm lub fuse resistor pom tias yog xim dub lossis kub hnyiab, nws tuaj yeem txiav txim siab tias nws cov load hnyav dhau, thiab tam sim no dhau los. nws tshaj tus nqi ntsuas ntau zaus; Ib qho qhib Circuit Court yam tsis muaj kab qhia tau hais tias qhov ntws tam sim no tsuas yog sib npaug los yog me ntsis siab dua nws cov nqi fusing. Rau kev txiav txim siab ntawm qhov zoo ntawm lub fuse resistor yam tsis muaj ib qho chaw ntawm qhov chaw, nws tuaj yeem ntsuas nrog r × 1 iav ntawm multimeter. Txhawm rau kom ntsuas qhov tseeb, ib qho kawg ntawm fuse resistor yuav tsum tau muab tshem tawm ntawm lub voj voog. Yog tias qhov ntsuas ntsuas qhov ntsuas tsis muaj qhov kawg, nws txhais tau hais tias lub fuse resistor tsis tuaj yeem qhib Circuit Court. Yog tias qhov ntsuas qhov ntsuas tsis zoo nyob deb ntawm tus nqi nominal, nws txhais tau tias tus nqi tiv thaiv tau hloov pauv thiab nws tsis haum rau kev siv. Hauv kev saib xyuas, nws pom tau tias tsawg tus fuse resistors tau tawg thiab luv luv hauv Circuit Court, thiab yuav tsum tau them nyiaj rau nws thaum kuaj pom.
Classification ntawm fuse resistors
Fuse resistors tuaj yeem muab faib ua ob hom: resettable fuse resistors thiab ib zaug fuse resistors.
(1) Resettable fuse resistor
Recoverable fuse resistors yog welded nyob rau hauv series nrog zoo tib yam resistors (los yog kuj nyob ntawm tej) nrog tsawg melting point solder thiab caij nplooj ntoos hlav hlau ratios (los yog elastic hlau los xij), thiab ces kaw nyob rau hauv ib tug cylindrical los yog square vaj tse. Muaj ntau hom plhaub xws li hlau thiab pob tshab yas.
Nyob rau hauv qhov ntsuas tam sim no, resettable fuse resistors ua raws li cov resistors ruaj. Thaum ib qho overcurrent tshwm sim nyob rau hauv Circuit Court, lub solder sib koom ntawm resettable fuse resistor melts ua ntej, kom lub caij nplooj ntoos hlav hom hlau hlau (los yog elastic hlau ntawv) yog disconnected los ntawm lub resistor. Tom qab teeb meem ntawm Circuit Court txhaum, weld lub resistor thiab cov hlau hlau (los yog hlau ntawv) raws li xav tau, thiab tom qab ntawd siv ib txwm tuaj yeem rov pib dua.
Feem ntau siv resettable fuse resistors suav nrog TH series R × 90 series thiab lwm yam.
(2) Disposable fuse resistor
Disposable fuse resistors tseem hu ua non-recoverable fuse resistors. Lawv ua raws li cov resistors ruaj thaum lub Circuit Court ua haujlwm ib txwm. Thaum qhov kev khiav hauj lwm tam sim no tshaj qhov ntsuas tam sim no, lub fuse resistors yuav tshuab zoo li lub fuse los tiv thaiv Circuit Court. , Tom qab ib zaug fuse resistor tau tshuab, nws tsis tuaj yeem kho lub sijhawm, thiab tsuas yog hloov tau nrog lub fuse resistor tshiab. Disposable fuse resistors tuaj yeem muab faib ua hlau-qhov txhab fuse resistors thiab zaj duab xis fuse resistors raws li cov khoom siv hauv lub cev resistor.
1. Hlau-qhov txhab fuse resistors Hlau-qhov txhab fuse resistors yog lub hwj chim-hom glazed resistors nrog me me kuj tseem ceeb, thiab feem ntau yog siv nyob rau hauv circuits nrog loj khiav hauj lwm tam sim no.
Thaum lub sij hawm tsim cov txheej txheem, ib feem ntawm lub hwj chim-hom glazed resistor yog mob nrog ib tug nyias hlau los yog raug (tsis muaj enamel tiv thaiv txheej). Thaum muaj kev cuam tshuam overcurrent tshwm sim nyob rau hauv lub tiv thaiv Circuit Court, lub nyias hlau los yog raug ib feem ntawm lub resistor (Lub unglazed ib feem) yuav raug tshuab vim overheating los tiv thaiv Circuit Court.
2. Zaj duab xis hom fuse resistors Zaj duab xis hom fuse resistors yog tam sim no feem ntau siv fuse resistors, thiab lawv muab faib ua carbon film fuse resistors, hlau zaj duab xis fuse resistors thiab hlau oxide zaj duab xis fuse resistors.
lwm yam ntaub ntawv ntsig txog
Thaum cov zaj duab xis hom fuse resistor yog tsim, lub zos xov suab ntawm cov zaj duab xis txheej feem ntau yog luv luv los yog nto ntawm cov zaj duab xis txheej yog coated nrog tsawg-melting iav muab tshuaj txhuam (los yog ib tug sib tov ntawm iav hmoov thiab hlau oxide, thiab lwm yam). Thaum dhau los ntawm lub fuse resistor Thaum cov kev khiav hauj lwm tam sim no loj heev, cov khaubncaws sab nraud povtseg ntawm cov resistor yuav fuse sai heev.
Lub plhaub ntawm zaj duab xis hom fuse resistors yog ua los ntawm ceramics, silicone resin, nplaim hluav taws retardant xim thiab lwm yam ntaub ntawv, thiab lub pob zoo li lub duab plaub, cylindrical, duav nruas thiab lwm yam ntaub ntawv.
Feem ntau siv hauv tsev hlau zaj duab xis fuse resistors yog RJ90-A, FJ90-B series thiab RF10, RF11 series.
RJ{{0}}A series muaj plaub qhov tshwj xeeb ntawm 0.5W thiab 1-3~W. Tus nqi kuj yog los ntawm 0.22Ω mus rau 5.1kΩ, tag nrho cov uas tau ntim rau hauv cov duab ntawm lub duav nruas, thiab muaj nyob rau hauv hom txheej (cov yeeb yaj kiab kuj yog coated nrog cov nplaim hluav taws xob xim) fusing resistors.
RJ{{0}}B series yog cov pob ceramic hom fuse resistor, kuj muab faib ua plaub yam tshwj xeeb: 0.5W, 1 ~ 3W. Ntawm lawv, cov duab pob ntawm 0.5W fuse resistor yog cylindrical, thiab RF1{{10}}} series fuse resistor yog coated xim nplhaib hlau zaj duab xis fuse resistor, nrog plaub specifications ntawm 0.25W, 0.5W, 1W thiab 2W, thiab qhov tsis kam yog 0.33Ω ~ 10kΩ.
RF11 series fuse resistors yog hlau zaj duab xis fuse resistors nrog ceramic plhaub, nrog plaub specifications ntawm 0.5W thiab 1 ~ 3W. Qhov kev tiv thaiv ntau yog tib yam li ntawm RF10 series. Lub pob ntawv muaj ob hom: cylindrical thiab rectangular.
