Xim cai resistor. Los hwj chim resistors tswvyim

Cov hluav taws xob circuits rau tam sim no hloov resistors yog siv. Qhov ntau ntau hom ntawm lawv. Yuav kom txiav txim siab nyob rau hauv tag nrho cov ntau yam ntawm cov ntsiab lus, rau txhua cov tswv yim cim ntawm lub resistor. Lawv cim nyob rau hauv txoj kev sib txawv, nyob ntawm seb cov hloov.

hom resistors

Resistor - ib tug ntaus ntawv uas muaj ib qho hluav taws xob kuj, nws cov ntsiab muaj nuj nqi - tam sim no txawj Circuit Court. Kev lag luam ua ntau hom resistors siv nyob rau hauv ib tug ntau yam ntawm kev pab kiag li lawm. Lawv faib yog nqa tawm nyob rau hauv ntau txoj kev, ib tug ntawm lawv - qhov ntawm cov kev hloov nyob rau hauv kuj. Raws li qhov no faib distinguishes 3 hom resistors:

1. Taag resistors. Lawv tseem tsis tau mus arbitrarily hloov tus nqi ntawm cov kuj. By lub sij hawm no, lawv yuav muab faib mus rau hauv ob hom: general thiab tej daim ntawv sau npe. Cov yav tas yog muab faib rau lub sij hawm precision, high-impedance, high-voltage thiab siab zaus.
2. Kuj tsis paub meej resistors (lawv yog hu ua cov hloov). Muaj cov muaj peev xwm mus hloov cov kuj los ntawm cov tswj kov. Nyob rau ib tug tsim lawv yog sib txawv heev. Muaj yog ib tug chav dej nrog ib tug mus, muab ob npaug rau, triple (piv txwv li nyob rau hauv tib lub axis yog txawm peem rau nrog ob los yog peb resistor) thiab ntau lwm hom.
3. Trimmer resistors. Nws tsuas yog siv thaum lub sij hawm lub teeb ntawm cov kev ntaus ntawv. qhov chaw kawm lub cev lawv tsuas yog muaj nyob rau hauv ib tug ntswj ntsia hlau. Nws tsim ib tug loj tus naj npawb ntawm ntau kev hloov kho ntawm cov resistors. Lawv yog siv nyob rau hauv tag nrho cov hom ntawm hluav taws xob thiab hluav taws xob xws li los ntawm cov ntsiav tshuaj kom loj industrial sib.

Ib txhia hom sib tham resistors hais hauv qab no muaj qhia nyob rau hauv cov duab.

Cov kev faib txoj kev mounting Cheebtsam

Muaj 3 theem pib hom ntawm mounting tshuab hluav taws xob lub Cheebtsam, mounted, luam thiab micromodules. Rau txhua hom ntawm installation yog nws hais, lawv sib txawv heev ob leeg nyob rau me me thiab tsim. Siv rau kev nto mounting resistors, capacitors thiab semiconductors. Lawv yog cov muaj nyob nrog ya ua, uas lawv yuav tsum tau soldered mus rau hauv lub Circuit Court. Vim lub miniaturization ntawm hluav taws xob, qhov no txoj kev yog maj poob tseeb.
PCB siv ib tug me me-sized qhov chaw nrog ua rau soldering rau ib tug luam Circuit Court board , los yog tsis muaj lawv. Rau cov tebchaw nrog rau hauv Circuit Court qhov chaw muaj kev sib cuag los. Sau xov ho pab txo qhov luaj li cas ntawm hluav taws xob khoom.

Rau printing thiab mounting mikromodulnogo feem ntau siv smd-resistor. Lawv yog cov heev me me nyob rau hauv loj, ib qho yooj yim mus rau integrate nrog tshuab phom nyob rau hauv cov ntawv luam Circuit Court board thiab micro-modules. Lawv yog cov muaj nyob rau hauv txawv nominal kuj, lub hwj chim, thiab loj. Lub advanced hluav taws xob no mas siv smd-resistor.

Nominal kuj thiab plated hwj chim resistors

Standard kuj, qhia nyob rau hauv ohms los yog megohms kiloomah, nws yog ib tug yooj yim cov yam ntxwv ntawm lub resistor. Qhov no tus nqi yog qhia nyob rau hauv lub Circuit Court kos duab, nws yog thov ncaj qha mus rau ib tug resistor nyob rau hauv alphanumeric code. Nyob rau hauv xyoo tsis ntev los, feem ntau yog hos xim-coded resistors.

Qhov thib ob qho tseem ceeb heev cov yam ntxwv ntawm ib tug resistor - nws lub hwj chim dissipation, nws yog qhia nyob rau hauv watts. Tej resistor los dua tam sim no los ntawm nws yog rhuab, i.e. dissipates. Yog hais tias lub hwj chim no tshaj qhov permissible nqi ntawm cov resistor teev cov kev puas tsuaj. Nyob rau hauv tus txheej txheem cim hwj chim resistors nyob rau hauv Scheme yuav luag ib txwm tam sim no, qhov no tus nqi yog feem ntau ua ntawv thov thiab nws tsev.

Kam nominal kuj thiab nws dependence rau kub

Ntawm kuj zoo kawg tseem ceeb yog qhov yuam kev, los yog txawv los ntawm nominal tus nqi, ntsuas nyob rau hauv feem pua. Nws yog tsis yooj yim sua rau raws nraim tsim lub thov resistor nrog tsis kam tus nqi yog yuav tsum tau los ua ib tug sib txawv los ntawm ib tug predetermined nqi. Cov kev ua yuam kev yog qhia ncaj qha rau ntawm lub cev, feem ntau nyob rau hauv daim ntawv ntawm ib tug code uas dawb lias kab txaij. Nws yog kwv yees li ib feem pua ntawm cov nominal kuj muaj nqis.

Qhov twg muaj cov loj loj hloov mus hloov los nyob rau hauv kub, ib tug txiav txim tsis kam nqi muaj kub dependence los yog kub coefficient ntawm kuj, abbreviations - TCR raws li ntsuas nyob rau hauv txheeb ze units ntawm ppm / ° C. TCS qhia tau hais tias yog dab tsi yog ib feem ntawm lub nominal kuj ntawm lub resistor hloov yog hais tias tus ambient kub nce (txo) los ntawm 1 ° C.

Conditional graphical cim resistor Circuit Court

Thaum nqus circuits yuav tsum tau ua kevcai nco txog GOST 2.728-74 zwj ceeb nyob rau graphic cim (ASB). Lub resistor txhua yam - yog ib tug duab plaub 10x4 hli. Thaum nws puag graphics yog tsim rau lwm hom ntawm resistors. Dhau li ASB, ib tug los yuav tsum tau hwj chim resistors nyob rau hauv lub Circuit Court, nws tswj nws tsom xam rau troubleshooting. Nyob rau hauv lub rooj hauv qab no yog teev tseg cov ASB qhov kuj, cim tias seb thaum lub hwj huam dissipation.

Hauv qab no cov duab qhia tau hais tias qhov chaw ruaj resistors ntawm txawv zog.

Conditional graphical cim ntawm nce mus nce los resistors

ASB nce mus nce los resistors yog siv mus rau lub tswvyim zoo li raws li tsau resistors, raws li lub xeev tus qauv GOST 2.728-74. Lub rooj qhia tau hais tias cov duab ntawm cov resistors.

Cov duab zog thiab trimmer muaj qhia hauv qab no.

Standard los resistors

International kev cai rau cov txhais lub nominal kuj ntawm lub resistor nyob rau hauv lub Circuit Court thiab lub resistor yog ib tug me ntsis txawv. Cov kev cai ntawm no cim, ua ke nrog kuaj cov piv txwv yog muaj nyob rau hauv lub rooj.

Lub rooj qhia tau hais tias cov ntawv nyob rau hauv lub schemes ntawm qhov kuj resistors ua ib tug alphanumeric code, thawj muaj yog ib tug hais txog zauv tus nqi ntawm kuj, ces cov chav nyob ntawm kev ntsuas. Lub cev lub ntsiab ntawm cov resistor yog txais nyob rau hauv cov signage es tsis txhob ntawm ib tug tsis nco qab siv cov tsab ntawv yog hais tias nws yog ohms, ces muab tso rau lub R E los yog, yog tias kiloomah, tsab ntawv K. Thaum npav megohms es tsis txhob ntawm ib tug tsis nco qab yog siv tsab ntawv M.

Xim coding ntawm resistors

Xim coding ntawm resistors tau ua kom nws yooj yim mus muab cov ntaub ntawv nyob rau hauv cov kev yam ntxwv ntawm lawv tsev. Ua li no, thov ob peb xim ib daim hlab ntawm txawv xim. Cia li los ib daim hlab ua los ntawm 12 sib txawv xim. Txhua yam ntawm lawv nws muaj nws tus kheej tej ntsiab lus. Cov xim code yog thov mus resistors ntug nyob rau hauv nws tsawg yog cov neeg (20%) yog thov mus rau lub sawb 3. Yog hais tias cov neeg ntawm lub saum toj no, tus kuj yuav pom twb 4 ib daim hlab.

Thaum siab precision resistor yog thov 5-6 ib daim hlab. Nyob rau hauv npav uas muaj 3-4 daim hlab, thawj ob sawv cev rau cov kuj nqi, peb sawb - qhov no yog qhov d, nws yog multiplied by cov nqi no. Tom ntej no band yog precision resistor. Thaum npav muaj 5-6 strips 3 sib haum mus rau tus thawj kuj. Tom ntej no band - yog ib qhov zoo tshaj, sis thib 5 ntawd sawb sau raws nkaus Ii raug thiab 6 - kub coefficient.

Yuav kom decrypt cov xim lis dej num ntawm resistors, muaj lookup ntxhuav.

resistors SMD

Nto Mount - qhov no yog thaum tag nrho cov lus yog nyob rau hauv lub Rooj Tswjhwm Saib ntawm cov ntawv luam Circuit Court lem. Nyob rau hauv cov ntaub ntawv no, tsis txhob tho qhov rau mounting Cheebtsam, lawv yog soldered mus rau txoj kev. No installation kev lag luam ua ib tug ntau ntawm cov smd-Cheebtsam: resistors, diodes, capacitors, semiconductor pab kiag li lawm. Cov ntsiab yog me npaum li cas thiab technologically suited rau cia li los ua ke. Siv smd-Cheebtsam yuav txo tau qhov luaj li cas ntawm hluav taws xob khoom. Deg mount electronics suab hloov txoj kev cai tag nrho lwm hom.

Nrog rau tag nrho cov zoo ntawm qhov suav hais tias installation nws muaj ib tug xov tooj ntawm drawbacks.

1. Sau Circuit Court board los ntawm no technology, kev ntshai thiab lwm yam cov neeg kho tshuab poob siab loads, raws li qhov no smd-puas yam.
2. Cov Cheebtsam yog ntshai ntawm overheating thaum lub sij hawm soldering vim hais tias ntawm lub zog sib txawv, lawv yuav keej temeratury. Qhov no kho raws yog ib qhov nyuaj mus ntes, nws feem ntau yog tshwm sim thaum lub sij hawm lub lag luam.

Standard los smd-resistor

Thawj-smd resistors yog cov sib txawv ntau thiab tsawg. Tus me tshaj loj - 0402, ib tug me ntsis ntau tshaj - 0603. Qhov tseem khiav smd-resistor loj - 0805, thiab ntau - 1008 nyob rau hauv cov nram no ntau thiab tsawg pab 1206, thiab qhov loj tshaj plaws - 1812 resistors muaj heev me me luaj li cas thiab heev uas tsis muaj zog.

Los smd-resistor los ntawm ib tug tshwj xeeb hais txog zauv code. Yog hais tias lub resistor loj yog 0402, uas yog qhov tsawg tshaj plaws, nws yog tsis cim. Resistors lwm ntau thiab tsawg pab ntxiv txawv nyob rau hauv nominal kuj kam rau: 2, 5, 10%. Tag nrho cov resistors cim nrog 3 tug lej tom qab. Cov thawj thiab thib ob ntawm lawv qhia lub mantissa, peb - ib tug d coefficient. Piv txwv li, lub code 473 yog nyeem raws li R = 47 ∙ ntawm 10 ³ ohms = 47 ohms.

Tag nrho resistors, uas muaj ib tug 1% kam rau ua, thiab loj tshaj 0805, cov cim muaj plaub tug lej tom qab. Raws li nyob rau hauv lub yav dhau los cov ntaub ntawv, cov thawj cov nuj nqis qhia mantissa denomination, thiab qhov zoo tshaj yuav qhia lub xeem zauv. Piv txwv li, lub code 1501 sawv li ntawd: R = 150 ∙ Lub ib hlis ntuj ¹⁰ = 1500 ohms = 1.5 kOhm. Ib yam li ntawd, nyeem rau ntawm lawd tus code.

Qhov yooj yim lub tswvyim

Qhov tseeb los nyob rau hauv lub schemes ntawm resistors thiab lwm yam hais - qhov yooj yim yuav tsum tau ntawm lub xeev cov qauv nyob rau hauv lub tsim ntawm hluav taws xob thiab hluav taws xob cov khoom. Nws lays cia txoj cai nyob rau hauv lub cim ntawm resistors, capacitors, inductors thiab lwm yam Circuit Court Cheebtsam. Nyob rau hauv daim duab qhia tsis tau tsuas yog lub resistor los yog lwm yam Circuit Court caij, tab sis kuj nws nominal tsis kam, thiab lub hwj chim, thiab rau capacitors - lub operating voltage. Hauv qab no yog ib qho piv txwv ntawm qhov nyuaj tswvyim nrog hais xaiv los ntawm tus txheej txheem.

Paub txog tag nrho cov pa duab cim thiab kev nyeem ntawv ntawm alphanumeric cov lis dej num rau cov ntsiab ntawm lub tswvyim yuav ua kom nws yooj yim kom to taub lub hauv paus ntsiab lus ntawm cov lag luam ntawm lub Circuit Court. Qhov tsab xov xwm no tham txog xwb resistors thiab Circuit Court hais ib tug ntau.