Dab tsi yog cov lus qhia rau kev qhia txog PCB qhov kam rau ua

Ib qho ntawm cov ntsiab lus tsis nco qab ntau hauv PCB tsim yog lub qhov rau mounting Cheebtsam. Tolerances ntawm lub qhov ntev yog teev nyob rau hauv PCB manufacturing kom zoo haum ntawm Plated Through Hole (PTH) Cheebtsam.

Altium Designer PCB tsim software tuaj yeem ntxiv qhov ua haujlwm siab rau koj cov ntaub qhwv thiab vias, uas yuav raug xa mus rau cov chaw tsim khoom los ntawm kev suav nrog hauv lub rooj xyaum. Nov yog tsib lub tswv yim los pab koj sai sai qhia qhov loj ntawm qhov hauv koj tus qauv PCB tom ntej.

Ua siab ntev

Cov ntaub ntawv cov ntaub ntawv sau npe ntxiv / rho tawm kom haum rau kev hloov pauv hauv kev laus, hnav, kub, plating, cov ntaub ntawv, machining, thiab lwm yam. Piv txwv li, 1/4 watt resistor cov chaw tsim khoom cov ntaub ntawv qhia txog kab kab ntawm 0. {4}}22 ± 0 {8}}03. Yog li, qhov tseeb txoj kab uas hla tuaj yeem sib txawv ntawm 0.019 txog 0.025.

Feem ntau cov tuam txhab PCB qhia txog qhov ua siab ntev ntawm ±{0}}.004. Cov hlau yuav tsum ib txwm haum rau hauv lub qhov, txawm tias nyob rau qhov loj lossis me kawg ntawm thaj tsam kam rau ua. Yog li, qhov tsawg kawg nkaus qhov loj yuav tsum ua kom haum rau qhov siab tshaj plaws resistor lead plus kam rau ua (0.{{10}}22 resistor lead ntxiv rau 0.003 resistor lead tolerance), ntxiv rau 0.004 PCB qhov kam rau ua. Yog li ntawd, 0.022 ntxiv rau 0.003 ntxiv rau 0.004=0.029 ntiv tes, qhov tsawg tshaj plaws qhov loj tso cai rau hauv lub rooj tsavxwm.

Thaum drilling, laum hnav tsawg dua. Xwb, lub laum yuav co los yog wobble me ntsis hauv lub qhov, uas ua rau lub qhov loj me ntsis. Lub qhov yog ces plated, thiab rau txhua batch los yog qhov chaw ntawm lub rooj tsavxwm, lub plating yuav thicker los yog nyias. Koj yuav tsum coj mus rau hauv tus account lub thermal expansion lossis contraction ntawm PCB substrate raws li nws undergoes processing. Yog li ntawd, qhov tolerances yog ib qho tseem ceeb nyob rau hauv tus txheej txheem tsim los xyuas kom meej qhov chaw ntawm PTH qhov chaw. Ib txoj cai ntawm tus ntiv tes xoo yog tias koj yuav tsum ua PCB qhov 0.007" loj dua li cov kab kab uas hla kom haum rau txhua qhov kev zam, laum hnav lossis wobble, thiab plating variations. Koj tuaj yeem hloov kho qhov kev kam rau lub qhov nyob hauv Pad thiab Properties dialog. Qhov qhov kam rau ua thiab qhov tseem ceeb kuj tuaj yeem tsim nyob rau hauv Pad Via Library vaj huam sib luag thiab Footprint Library.

5 Lub Tswv Yim rau Kev Qhia Txog PCB Qhov Kev Pom Zoo

Qhov qhov kam rau ua hauv Altium Designer tuaj yeem nkag mus thiab kho tau siv ntau txoj kev sib txawv, uas peb yuav tshuaj xyuas hauv qab no. Hauv txhua txoj kev, koj tuaj yeem teeb tsa qhov tsawg kawg nkaus (-) thiab qhov siab tshaj plaws (ntxiv rau ) qhov kam rau ua.

Qhov qhov kam rau ua hauv Altium Designer tuaj yeem nkag mus thiab kho tau siv ntau txoj kev sib txawv, uas peb yuav tshuaj xyuas hauv qab no. Hauv txhua txoj kev, koj tuaj yeem teeb tsa qhov tsawg kawg nkaus (-) thiab qhov siab tshaj plaws (ntxiv rau ) qhov kam rau ua.

Tswv yim 1 - Teem Lub Qhov Tolerance Properties for Specific Pads thiab Vias

Koj tuaj yeem teeb tsa lub ncoo / los ntawm kev kam rau ua raws li tus kheej cov khoom.

Right-click ib lub ncoo los ntawm thiab xaiv Properties. Nyob rau hauv Pad Properties dialog (Daim duab 1), kho lub qhov kam rau ua ntawm Qhov Cov Ntaub Ntawv.

Nyob rau hauv Cov Lus Qhia Los Ntawm Qhov Khoom, hloov lub qhov kam rau siab ntawm lub ces kaum sab laug "Kev Ua Siab ntev" hauv daim duab 2.

Daim duab 1 Teem lub qhov kam rau ua nyob rau hauv Pad Properties dialog Daim duab 2 Teem lub qhov kam rau ua nyob rau hauv Via Properties dialog

Tswv yim 2 - Siv Pad los yog Los Ntawm Qhov Ncauj Templates los teeb Qhov Qhov Tolerances

Koj tuaj yeem hais qhia lub qhov kam rau ua siv lub ncoo lossis cov qauv ntawm lub qhov.

Right-click Pad Via Library thiab xaiv Add Via Template lossis Add Pad Template. Qhov kev kam rau siab tuaj yeem teeb tsa ntawm "Cov Ntaub Ntawv Qhov".

Tswv yim 3 Teem Lub Qhov Tolerance Properties rau Ntau Pads lossis Vias ib zaug

Conneniently, koj tuaj yeem teeb lub qhov siab rau ntau lub ncoo lossis vias tib lub sijhawm.

Qhib "PCB Inspector" vaj huam sib luag, raws li qhia hauv daim duab 3. Xaiv cov ntaub qhwv los yog vias ntawm PCB los teeb tsa thiab nkag mus rau qhov tsim nyog qhov ntsuas qhov ntsuas nyob rau hauv kab sab xis hauv qab "Cov Khoom Tshwj Xeeb" vaj huam sib luag.

Table 1 Piv txwv lub rooj uas qhia tag nrho cov qhov kam rau ua ke

Koj tuaj yeem pab pawg lawv los ntawm qhov kam rau ua. Los ntawm Laum Symbols dialog (nias Configure Drill Symbols in the Drill Table dialog), nyem Grouping, thiab xaiv Qhov Kev Pom Zoo.

Nco ntsoov tias thaum ntxiv cov ntaub ntawv tiv thaiv lub qhov rau cov ntaub qhwv thiab vias, tshwj tsis yog tias tag nrho cov ntaub qhwv los yog vias pawg hauv qab "Count kem" kem muaj tib lub qhov kam rau ua tus cwj pwm, qhov qhov kam rau ua tus nqi yuav tshwm sim li * (Asterisk).

Nco tseg: Tom qab ntxiv cov ntaub ntawv rau lub rooj laum, koj yuav tsum nyem OK kom tawm ntawm Lub Rooj Sib Tham lossis koj cov kev hloov pauv yuav tsis raug cawm.

Hauv kev xaus

Kev ua kom zoo lub qhov kam rau ua yog qhov tseem ceeb rau kev txhim kho ntawm PTH cov khoom rau PCB. Altium Designer ua kom yooj yim cov ntaub ntawv ntawm koj lub qhov me me kam rau ua kom koj qhov kev zam txim tau yooj yim sib txuas lus rau koj cov chaw tsim khoom.