Hauv cov hluav taws xob hluav taws xob, cov khoom siv hluav taws xob tau siv los tswj cov tam sim no. Ib tug loj tus naj npawb ntawm ntau hom yog tsim. Txhawm rau txiav txim siab nyob rau hauv tag nrho cov ntau yam ntawm cov ntsiab lus, rau txhua tus, lub cim ntawm tus resistor yog qhia. Lawv raug cim rau hauv ntau txoj kev, nyob ntawm qhov hloov kho.
Hom resistors
Tus resistor yog ib yam khoom uas muaj hluav taws xob tsis kam, nws lub hom phiaj tseem ceeb yog txwv qhov tam sim no hauv hluav taws xob hluav taws xob. Kev lag luam tsim ntau hom resistors rau ntau yam khoom siv. Lawv qhov kev faib tawm yog nqa tawm hauv ntau txoj kev, ib qho ntawm lawv yog qhov kev hloov pauv ntawm kev tawm tsam. Raws li qhov kev faib tawm no, 3 hom resistors yog qhov txawv:
- Tsau resistors. Lawv tsis muaj peev xwm los hloov pauv tus nqi tsis kam. Raws li lawv lub hom phiaj, lawv tau muab faib ua ob hom: kev siv dav dav thiab tshwj xeeb. Cov yav tas yog muab faib raws li lawv lub hom phiaj rau precision, high-kuj, high-voltage thiab high-frequency.
- Kev hloov pauv hloov pauv (lawv kuj hu ua kho). Muaj peev xwmhloov qhov tsis kam nrog lub pob qhov rooj. Hais txog kev tsim, lawv txawv heev. Muaj kev sib xyaw ua ke nrog kev hloov pauv, dual, triple (uas yog, ob lossis peb lub resistors tau nruab rau ntawm ib qho axis) thiab ntau lwm yam.
- Timming resistors. Lawv tsuas yog siv thaum teeb tsa cov cuab yeej siv. Lawv lub cev hloov kho tsuas yog siv tau nrog lub hau ntswj. Ntau qhov kev hloov kho sib txawv ntawm cov resistors no tau tsim. Lawv tau siv rau hauv txhua yam khoom siv hluav taws xob thiab hluav taws xob, los ntawm cov ntsiav tshuaj mus rau kev lag luam loj.
Qee yam ntawm cov resistors sib tham tau qhia hauv daim duab hauv qab no.
Kev faib tawm ntawm cov khoom los ntawm txoj kev mounting
Muaj 3 lub ntsiab ntawm kev txuas ntawm cov khoom siv hluav taws xob: hinged, luam tawm thiab rau micromodules. Txhua hom kev teeb tsa muaj nws tus kheej cov ntsiab lus, lawv txawv ntawm qhov loj thiab tsim. Resistors, capacitors thiab semiconductor pab kiag li lawm yog siv rau nto mounting. Lawv muaj nyob nrog cov hlau lead kom lawv tuaj yeem raug soldered rau hauv Circuit Court. Vim yog qhov me me ntawm cov khoom siv hluav taws xob, txoj kev no maj mam poob nws qhov cuam tshuam.
Cov khoom me me yog siv rau cov ntawv luam tawm hluav taws xob, nrog lossis tsis muaj cov hlau lead rau hauv lub rooj tsav xwm luam tawm. Txhawm rau txuas nrog lub voj voog, cov khoom no muaj cov ntaub ntawv tiv tauj. Cov ntawv luam tawm tau ua rau muaj txiaj ntsig zoo rau kev txo qhov loj ntawm hluav taws xobkhoom.
Smd resistors feem ntau siv rau PCB thiab micromodule mounting. Lawv yog cov me me loj thiab tuaj yeem yooj yim sib xyaw rau hauv cov ntawv luam tawm Circuit Board thiab micromodules tau txais. Lawv muaj nyob rau hauv ntau yam nominal kuj, lub zog thiab ntau thiab tsawg. Cov khoom siv hluav taws xob tshiab tshaj plaws feem ntau siv smd resistors.
Rated kuj thiab lub zog dissipation ntawm resistors
Nominal resistance, qhia hauv ohms, kiloohms lossis megaohms, yog tus yam ntxwv tseem ceeb ntawm tus resistor. Tus nqi no yog muab rau ntawm daim duab kos, siv ncaj qha rau tus resistor hauv tus lej lej. Tsis ntev los no, cov xim xaiv ntawm cov resistors tau siv ntau zaus.
Qhov thib ob tseem ceeb tshaj plaws yam ntxwv ntawm tus resistor yog nws lub zog dissipation, uas yog qhia nyob rau hauv watts. Ib qho resistor heats li thaum tam sim no dhau los ntawm nws, uas yog, nws dissipates lub zog. Yog hais tias lub hwj chim no tshaj tus nqi tso cai, qhov kev puas tsuaj ntawm cov resistor tshwm sim. Raws li tus qauv, lub npe ntawm lub zog ntawm cov resistors nyob rau hauv Circuit Court yog yuav luag ib txwm tam sim no, tus nqi no feem ntau siv rau nws rooj plaub.
Kev kam rau siab ntawm nominal tsis kam thiab nws qhov kev cia siab ntawm qhov kub thiab txias
Qhov yuam kev, lossis kev sib txawv ntawm tus nqi nominal, ntsuas raws li feem pua, yog qhov tseem ceeb heev. Nws yog tsis yooj yim sua kom raug kiag li tsim ib tug resistor nrog cov lus tshaj tawm kuj tus nqi, nws yuav twv yuav raug hu muaj ib tug deviation ntawm tus nqi teev. Qhov yuam kev yog qhia ncaj qha rau ntawm lub cev, feem ntau nyob rau hauv daim ntawv ntawm ib tug code ntawm xim kab txaij. Nws raug ntsuas ntawmfeem pua ntawm nominal resistance value.
Qhov twg muaj qhov hloov pauv loj hauv qhov kub thiab txias, qhov kev cia siab ntawm kev tiv thaiv ntawm qhov kub thiab txias, lossis qhov kub coefficient ntawm kev ua haujlwm, abbreviated li TCR, ntsuas hauv cov txheeb ze units ppm / ° C, yog qhov tseem ceeb heev. TKS qhia los ntawm ib feem ntawm tus nqi nominal qhov kev tiv thaiv ntawm qhov hloov pauv yog tias qhov kub ntawm qhov nruab nrab nce (qis) los ntawm 1 ° C.
Txoj kev kos duab kos npe ntawm tus resistor hauv daim duab
Thaum kos cov phiaj xwm, ua raws li lub xeev tus qauv GOST 2.728-74 rau cov qauv duab kos duab (UGO) yuav tsum tau ua. Lub npe ntawm cov resistor ntawm txhua yam yog 10x4 mm duab plaub. Raws li nws, cov duab nraaj yog tsim rau lwm hom resistors. Ntxiv nrog rau UGO, lub npe ntawm lub zog ntawm cov resistors ntawm lub Circuit Court yog xav tau, qhov no ua rau nws yooj yim rau kev soj ntsuam thaum daws teeb meem. Cov lus hauv qab no qhia txog UGO ntawm qhov kev tawm tsam tsis tu ncua nrog qhov qhia txog lub zog dissipation.
Daim duab hauv qab no qhia tau tias muaj qhov sib txawv ntawm qhov sib txawv.
Cov duab kos duab kos npe ntawm qhov sib txawv ntawm cov resistors
UGO hloov pauv hloov pauv tau siv rau daim duab kos duab hauv ib yam li cov resistors ruaj khov, raws li lub xeev tus qauv GOST 2.728-74. Lub rooj qhia cov duab ntawm cov resistors.
Daim duab hauv qab no qhia txog qhov sib txawv thiab cov trimmers.
Tus qauv tsim rau qhov tsis kam tiv thaiv
Nws yog kev cai rau cov qauv thoob ntiaj teb los xaiv tus nominal tsis kam ntawm tus resistor ntawm Circuit Court thiab ntawm tus resistor nws tus kheej txawv me ntsis. Cov cai rau cov ntawv sau no, nrog rau cov qauv piv txwv, tau muab rau hauv lub rooj.
| tag nrho npe | Tus sau npe | ||||||
| Unit of ntsuas | Tsim. units rev. | Nominal txwv resistance | ntawm daim duab | rau lub cev | Nominal txwv resistance | ||
| Ohm | Ohm | 999, 9 | 0, 51 | E51 or R51 | 99, 9 | ||
| 5, 1 | 5E1; 5R1 | ||||||
| 51 | 51E | ||||||
| 510 | 510E; K51 | ||||||
| Kilohm | kOhm | 999, 9 | 5, 1k | 5K1 | 99, 9 | ||
| 51k | 51K | ||||||
| 510k | 510K; M51 | ||||||
| Megaohm | MOhm | 999, 9 | 5, 1M | 5M1 | 99, 9 | ||
| 51M | 51M | ||||||
| 510M | 510M | ||||||
Lub rooj qhia tau hais tias qhov kev xaiv ntawm daim duab ntawm cov resistors ntawm qhov kev tiv thaiv tsis tu ncua yog tsim los ntawm tus lej lej, ua ntej los ntawm tus lej tus nqi ntawm qhov kev tawm tsam, tom qab ntawd qhov ntsuas ntsuas tau qhia. Nyob rau hauv lub cev ntawm tus resistor, nws yog kev cai siv ib tsab ntawv es tsis txhob ntawm ib tug comma nyob rau hauv lub digital designation, yog hais tias nws yog ohms, ces E los yog R muab tso, yog kiloohms, ces tsab ntawv K. Thaum xaiv megaohms, tsab ntawv M. yog siv comma.
Cov xim-coded resistors
Cov xim xaiv ntawm cov resistors tau txais los ua kom yooj yim rau cov ntaub ntawv hais txog cov yam ntxwv ntawm lawv rooj plaub. Rau qhov no, siv ob peb xim strips ntawm cov xim sib txawv. Nyob rau hauv tag nrho, 12 xim sib txawv tau txais nyob rau hauv lub npe ntawm kab txaij. Txhua tus ntawm lawv muaj nws tus kheej lub ntsiab lus. Cov xim xim ntawm cov resistor yog siv los ntawm ntug, nrog rau qhov tseeb tsawg (20%) 3 strips yog siv. Yog tias qhov tseeb siab dua, koj tuaj yeem pom 4 bar ntawm qhov tsis kam.
Thaum tus resistor yog qhov tseeb, 5-6 strips raug siv. Rau ib lub cim uas muaj 3-4 strips, thawj ob qhia txog tus nqi kuj, qhov thib peb strips yog ib tug multiplier, tus nqi no yog multiplier los ntawm nws. Lub bar tom ntej txiav txim siab qhov tseeb ntawm tus resistor. Thaum lub cim muaj 5-6 strips, thawj 3 sib haum mus rau qhov tsis kam. Qhov bar tom ntej no yog qhov sib npaug, qhov 5th bar yog qhov tseeb, thiab 6th bar yog qhov kub thiab txias coefficient.
Cov lus qhia muaj nyob rau kev txiav txim siab xim xim ntawm cov resistors.
Nto Mount Resistors
Nto mount yog thaum txhua qhov chaw nyob ntawm lub rooj tsavxwm los ntawm sab ntawm cov ntawv luam tawm. Nyob rau hauv cov ntaub ntawv no, lub qhov rau mounting ntsiab tsis drilled, lawv yog soldered rau cov lem. Rau qhov kev teeb tsa no, kev lag luam tsim ntau yam khoom siv smd: resistors, diodes, capacitors, semiconductor li. Cov ntsiab lus no yog me dua qhov loj me thiab thev naus laus zis hloov kho rau kev teeb tsa automated. Kev siv cov khoom siv smd tuaj yeem txo qhov loj ntawm cov khoom siv hluav taws xob. Nto mounting nyob rau hauv electronics tau yuav luag supplanted tag nrho lwm yam.
Nrog txhua qhov zoo ntawm kev teeb tsa hauv nqe lus nug, nws muaj ntau qhov tsis zoo.
- Print Circuit boards uas siv cov thev naus laus zis no ntshai ntawm kev poob siab thiab lwm yam khoom siv, vim tias cov khoom siv smd puas lawm.
- Cov khoom no ntshai tsam overheating thaum soldering, vim lawv tuaj yeem tawg los ntawm qhov kub thiab txias. Qhov teeb meem no nyuaj rau nrhiav pom, feem ntau nws tshwm sim thaum lub sijhawm ua haujlwm.
qauv tsim ntawm smd resistors
Ua ntej ntawm tag nrho, smd resistors txawv qhov loj. Qhov loj tshaj plaws yog 0402, me ntsis ntxiv yog 0603. Qhov loj tshaj plaws ntawm ib qho smd resistor yog 0805, thiab ib qho loj dua yog 1008, qhov loj tshaj plaws yog 1206 thiab qhov loj tshaj plaws yog 1812. Resistors ntawm qhov loj tshaj plaws muaj lub zog qis tshaj..
Lub npe ntawm smd resistors yog ua los ntawm cov lej tshwj xeeb digital. Yog hais tias tus resistor muaj qhov loj ntawm 0402, uas yog, qhov tsawg tshaj plaws, ces nws tsis raug cim nyob rau hauv ib txoj kev. Resistor ntawm lwm qhov ntau thiab tsawg kuj txawv nyob rau hauv lub siab ntev ntawm nominal kuj: 2, 5, 10%. Tag nrho cov resistors no tau sau nrog 3 tus lej. Thawj thiab thib ob ntawm lawv qhia cov mantissa, qhov thib peb - tus multiplier. Piv txwv li, code 473 nyeem li no R=47∙103 Ohm=47 kOhm.
Txhua tus resistors uas muaj 1% kam rau ua thiab qhov loj dua 0805 muaj plaub tus lej cim. Ib yam li yav dhau los, thawjcov lej qhia tus mantissa ntawm lub denomination, thiab tus lej kawg qhia tus lej. Piv txwv li, code 1501 yog decoded raws li nram no: R=150∙101=1500 Ohm=1.5 kOhm. Lwm cov lej nyeem zoo ib yam.
Daim duab kab kos yooj yim tshaj plaws
Kev tsim kom raug ntawm cov resistors thiab lwm cov ntsiab lus ntawm cov duab kos yog qhov tseem ceeb ntawm lub xeev cov qauv hauv kev tsim cov khoom siv hluav taws xob thiab hluav taws xob. Tus qauv tsim cov kev cai rau cov lus pom zoo ntawm cov resistors, capacitors, inductors thiab lwm yam khoom siv hluav taws xob. Daim duab qhia tsis tau tsuas yog lub npe ntawm ib tug resistor los yog lwm yam Circuit Court, tab sis kuj nws nominal kuj thiab lub hwj chim, thiab rau capacitors, lub khiav hauj lwm voltage. Hauv qab no yog ib qho piv txwv ntawm daim duab kos duab uas yooj yim tshaj plaws nrog cov ntsiab lus raug xaiv raws li tus qauv.
Kev paub txog tag nrho cov qauv duab kos duab thiab nyeem cov lej lej rau cov ntsiab lus hauv Circuit Court yuav ua rau nws yooj yim rau kev nkag siab lub hauv paus ntsiab lus ntawm Circuit Court. Hauv kab lus no, tsuas yog cov resistors raug txiav txim siab, thiab muaj ob peb lub ntsiab lus Circuit Court.
