SMD-resistors: hauj lwm, labeling

SMD (lub Nto Mounted Devices ') txhais ua lus Askiv txhais tau tias "ib tug ntaus ntawv mounted rau ntawm qhov chaw." SMD-Cheebtsam kaum sij hawm me me nyob rau hauv loj thiab nyhav dua pa qhov chaw, li no tsis tau raws li ib tug ntau dua kev ceev ntawm mounting rau ib tug luam Circuit Court board pab kiag li lawm. Niaj hnub no electronics tsim zoo kawg li pace, yog ib lub chaw - yog los txo cov zuag qhia tag nrho qhov ntev thiab luj ntawm lub pab kiag li lawm. SMD-Cheebtsam - vim lawv loj, me, uas tsis muaj nqi, high quality - tau txais ib lossis loj kis thiab yog nce hloov classical ntsiab nrog hlau ua.

Lub yees duab hauv qab no qhia tau hais tias lub SMD-resistors yog muab tso rau hauv PCB. Koj yuav pom tias, vim yog lub me me luaj li cas ntawm lub ntsiab tiav ib siab packing ceev. Feem ntau cov khoom no tso rau hauv lub qhov nyob rau hauv lub rooj tsavxwm thiab lub SMD-resistors yog soldered mus rau qhov chaw nyob rau hauv qhov chaw ntawm cov ntawv luam Circuit Court board hu paths (Piglet), uas kuj simplifies tus tsim thiab los ua ke ntawm xov tooj cua-hluav taws xob. Nrog rau cov muaj peev xwm mus rau Mount lub Symptoms ntawm xov tooj cua Cheebtsam yog ua tau los tsim cov ntawv Circuit Court laug cam yog tsis tsuas ob sab sib dho, tab sis kuj multi-layered, outwardly li ib tug txheej ncuav mog qab zib.

ua los ntawm cov nram qab no txoj kev nyob rau hauv industrial qhuav soldering SMD-Cheebtsam: tus khiav board hu rau solder thov tshwj xeeb thermopaste (flux yog tov nrog solder hmoov), tom qab uas tus neeg hlau muaj ib qho chaw nyob rau hauv cov yam ntsiab xws li SMD-resistors. Paub meej ua raws li cov solder muab tshuaj txhuam yog ces muab tso rau hauv ib tug tshwj xeeb them nyiaj ib qhov cub nyob qhov twg nws yog rhuab mus rau lub yam kub uas tus solder melts nyob rau hauv lub tshuaj txhuam suab flux. Yog li lub ntsiab lus tau nyob rau hauv lub rooj zaum. Tom qab ntawd, cov PCB yog muab tshem tawm los ntawm lub cub tawg thiab txias.

Rau soldering SMD hom Cheebtsam nyob rau hauv lub tsev yuav tsum muaj cov nram qab no cov cuab yeej: ciaj tais, ib tug Awl, pliers, siab iav koob txhaj nrog ib tug tuab koob, ib tug soldering hlau nrog ib tug nplua nyiaj, kub huab cua soldering chaw nres tsheb. Ntawm consumables yuav tsum tau lo, kua flux. Nws yog ntshaw, ntawm chav kawm, siv lub soldering chaw nres tsheb, tab sis yog tias koj ua tsis tau, koj yuav tau txais los ntawm nrog ib tug soldering hlau. Thaum soldering lub tseem ceeb tshaj plaws - mus tiv thaiv kom txhob overheating ntawm Cheebtsam thiab lub PCB. Yuav kom lub ntsiab tsis txav thiab tsis daig rau txoj kev lwj siab ntawm ib tug soldering hlau, lawv yuav tsum tau nias rau lub koob board.

SMD-resistors pib heev ib tug ntau ntawm nominal qhov tseem ceeb ntawm ib tug mus peb caug Ohm megohm. Kev khiav hauj lwm kub ntawm lub resistors mas nws txawv ntawm -550 ° C rau + 1250 ° C. Fais fab SMD-resistor nce mus txog 1W. Los ua lub hwj chim kom lub zuag qhia tag nrho dimensions. Piv txwv li, resistors SMD hwj chim 0.05 W muaj qhov ntev 0.6 * 0.3 * 0.23 hli thiab ib lub hwj chim ntawm 1 W - 3.2 * 6.35 * 0.55 hli.

Npav cov resistors yuav ua tau ntawm peb yam: peb tug, plaub tug lej thiab peb cim:

- Cov thawj ob tug lej tom qab qhia tus nqi ntawm cov resistor nqi nyob rau hauv ohms, thiab lub xeem - lub xov tooj ntawm zeros. Piv txwv li, npav nyob rau resistor 102 yog 1000 ohms los yog 1K.

- Cov thawj peb tug lej tom qab ntawm lub resistor qhia lub nominal tus nqi nyob rau hauv ohms, thiab lub xeem - lub xov tooj ntawm zeros. Piv txwv li, npav lub resistor 5302 yog 53 kohm.

- Cov thawj ob cim qhia lub resistor nqi nyob rau hauv ohms nominal tus nqi, coj los ntawm cov lus saum toj no, thiab lub xeem ua cim qhia ib tug d nqi: S = 10-2; R = 10-1; B = 10; C = 102; D = 103; E = 104; F = 105. Piv txwv li, npav lub resistor 11C yog 12.7 kohm.