{"id":4732,"date":"2026-02-27T06:10:50","date_gmt":"2026-02-27T06:10:50","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4732"},"modified":"2026-02-27T06:10:54","modified_gmt":"2026-02-27T06:10:54","slug":"how-to-select-pcb-copper-thickness","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/fi\/how-to-select-pcb-copper-thickness\/","title":{"rendered":"Miten valita PCB-kuparin paksuus"},"content":{"rendered":"<h2 class=\"wp-block-heading\">1. Mit\u00e4 kuparifolio on?<\/h2>\n\n\n\n<p>Kuparifolio on ohut, yhten\u00e4inen metallilevy. Se on s\u00e4hk\u00f6pinnoitettua, negatiivista materiaalia. Kalvo pinnoitetaan piirilevyn pohjalle. Se toimii levyn johtimena. Se kiinnittyy hyvin eristekerroksiin. Se kest\u00e4\u00e4 juotosmaskia ja muita suojakerroksia. Sy\u00f6vytyksen j\u00e4lkeen j\u00e4ljelle j\u00e4\u00e4v\u00e4 kupari muodostaa piirikuvion. Varhaisessa tuotannossa k\u00e4ytettiin rullattua kuparifoliota. Se tarkoittaa, ett\u00e4 kuparilohkot litistet\u00e4\u00e4n ohuiksi levyiksi.<\/p>\n\n\n\n<p>Kuinka paksu on piirilevyn kuparifolio?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Kuparin paksuuden yksikk\u00f6: oz<\/h2>\n\n\n\n<p>PCB-kuparin paksuus ilmoitetaan yleens\u00e4 oz (unssina). Unssia on painoyksikk\u00f6. Unssin ja gramman suhde on:<br>1 oz \u2248 28,35 g.<\/p>\n\n\n\n<p>Piirilevyteollisuudessa 1 oz tarkoittaa 1 oz kuparin painoa tasaisesti levitettyn\u00e4 1 neli\u00f6jalalle (ft\u00b2). Tasaisella kerroksella on tietty paksuus. T\u00e4m\u00e4 paksuus on noin 35 \u03bcm. Kaavaa k\u00e4ytt\u00e4en:<br>1 oz = 28,35 g \/ ft\u00b2.<\/p>\n\n\n\n<p>Alla n\u00e4yt\u00e4n laskennan vaihe vaiheelta, jotta tulos on selke\u00e4:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ota 1 unssin massa: 28,35 g.<\/li>\n\n\n\n<li>Kuparin tiheys: 8,93 g\/cm\u00b3.<\/li>\n\n\n\n<li>1 ft\u00b2 = 929,03 cm\u00b2.<\/li>\n<\/ul>\n\n\n\n<p>Paksuus cm:n\u00e4 = massa \/ (tiheys \u00d7 pinta-ala)<br>= 28,35 \/ (8,93 \u00d7 929,03) cm.<br>= 28,35 \/ 82973,558 \u2248 0,00341721 cm.<\/p>\n\n\n\n<p>Muunna mikrometreiksi (\u03bcm): 0,00341721 cm = 0,00341721 \u00d7 10 000 \u03bcm = 34,17 \u03bcm.<\/p>\n\n\n\n<p>Joten 1 oz kuparifoliota \u2248 <strong>34,17 \u03bcm<\/strong>. T\u00e4m\u00e4 arvo py\u00f6ristet\u00e4\u00e4n yleens\u00e4 ja ilmoitetaan muodossa <strong>35 \u03bcm<\/strong>. Englannin kruunun yksik\u00f6iss\u00e4 34,17 \u03bcm = 0,03417 mm. Yksi mil = 0,0254 mm, joten paksuus \u2248 1,345 mil. Usein sanotaan <strong>1 oz \u2248 35 \u03bcm \u2248 1,35 mil (millimetri\u00e4)<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Yleiset kuparin paksuuden arvot<\/h2>\n\n\n\n<p>PCB:ss\u00e4 k\u00e4ytetyt yleiset kuparin paksuusarvot ovat:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>0.5 oz \u2248 17.5 \u03bcm<\/li>\n\n\n\n<li>1 oz \u2248 35 \u03bcm<\/li>\n\n\n\n<li>2 oz \u2248 70 \u03bcm<\/li>\n\n\n\n<li>3 oz \u2248 105 \u03bcm<\/li>\n<\/ul>\n\n\n\n<p>Tyypilliset yhden ja <a href=\"https:\/\/flj-pcb.com\/fi\/pcb-manufacturer\/multilayer-pcb\/\" data-type=\"link\" data-id=\"https:\/\/flj-pcb.com\/pcb-manufacturer\/multilayer-pcb\/\">kaksipuoliset piirilevyt<\/a> k\u00e4yt\u00e4 noin <strong>35 \u03bcm (1 oz)<\/strong> kupari. Joissakin levyiss\u00e4 k\u00e4ytet\u00e4\u00e4n <strong>50 \u03bcm<\/strong> tai <strong>70 \u03bcm<\/strong> my\u00f6s kuparia. Monikerroksisissa levyiss\u00e4 ulommat kerrokset ovat usein <strong>35 \u03bcm (1 oz)<\/strong>. Sis\u00e4kerrokset ovat usein <strong>17,5 \u03bcm (0,5 oz)<\/strong>.<\/p>\n\n\n\n<p>Paksut kuparilevyt alkavat noin <strong>3 oz<\/strong> ja sit\u00e4 suuremmat. N\u00e4it\u00e4 levyj\u00e4 k\u00e4ytet\u00e4\u00e4n suurivirtaisissa tai suurj\u00e4nnitetuotteissa, kuten virtal\u00e4hteiss\u00e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Virransietokyky eri kuparin paksuuksilla<\/h2>\n\n\n\n<p>Alla on k\u00e4yt\u00e4nn\u00f6nl\u00e4heinen taulukko, josta k\u00e4y ilmi paksuudeltaan ja leveydelt\u00e4\u00e4n eripaksuisten kupariliuskojen tyypillinen virrankapasiteetti. Taulukossa on lueteltu virta (A) ja tarvittava leveys (mm) seuraaville kuparipaksuuksille <strong>70 \u03bcm<\/strong>, <strong>50 \u03bcm<\/strong>, ja <strong>35 \u03bcm<\/strong>. Taulukon testipaksuusparametrina on t = 10 (t\u00e4m\u00e4 on l\u00e4hdetaulukossa k\u00e4ytetty viitearvo).<\/p>\n\n\n\n<p><strong>Huom:<\/strong> Kun kuparifoliota k\u00e4ytet\u00e4\u00e4n suuren virran johtimena, on tavallista, ett\u00e4 taulukkoarvoja alennetaan seuraavasti <strong>50%<\/strong> turvallinen valinta. T\u00e4m\u00e4 tarkoittaa, ett\u00e4 valitse leveys, joka vastaa noin puolta luetellusta virrasta, jos haluat varmuusmarginaalin.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Virta (A) \/ leveys (mm) 70 \u03bcm:n osalta.<\/th><th>Virta (A) \/ leveys (mm) 50 \u03bcm:n osalta.<\/th><th>Virta (A) \/ leveys (mm) 35 \u03bcm:n osalta.<\/th><\/tr><\/thead><tbody><tr><td>6,00 A - 2,50 mm<\/td><td>5,10 A - 2,50 mm<\/td><td>4,50 A - 2,50 mm<\/td><\/tr><tr><td>5,10 A - 2,00 mm<\/td><td>4,30 A - 2,00 mm<\/td><td>4.00 A - 2.00 mm<\/td><\/tr><tr><td>4,20 A - 1,50 mm<\/td><td>3,50 A - 1,50 mm<\/td><td>3,20 A - 1,50 mm<\/td><\/tr><tr><td>3,60 A - 1,20 mm<\/td><td>3,00 A - 1,20 mm<\/td><td>2,70 A - 1,20 mm<\/td><\/tr><tr><td>3,20 A - 1,00 mm<\/td><td>2,60 A - 1,00 mm<\/td><td>2,30 A - 1,00 mm<\/td><\/tr><tr><td>2,80 A - 0,80 mm<\/td><td>2,40 A - 0,80 mm<\/td><td>2,00 A - 0,80 mm<\/td><\/tr><tr><td>2,30 A - 0,60 mm<\/td><td>1,90 A - 0,60 mm<\/td><td>1,60 A - 0,60 mm<\/td><\/tr><tr><td>2,00 A - 0,50 mm<\/td><td>1,70 A - 0,50 mm<\/td><td>1,35 A - 0,50 mm<\/td><\/tr><tr><td>1,70 A - 0,40 mm<\/td><td>1,35 A - 0,40 mm<\/td><td>1,10 A - 0,40 mm<\/td><\/tr><tr><td>1,30 A - 0,30 mm<\/td><td>1,10 A - 0,30 mm<\/td><td>0,80 A - 0,30 mm<\/td><\/tr><tr><td>0,90 A - 0,20 mm<\/td><td>0,70 A - 0,20 mm<\/td><td>0,55 A - 0,20 mm<\/td><\/tr><tr><td>0,70 A - 0,15 mm<\/td><td>0,50 A - 0,15 mm<\/td><td>0,20 A - 0,15 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Valitse j\u00e4lleen turvallinen marginaali. Yleinen s\u00e4\u00e4nt\u00f6 on v\u00e4hent\u00e4\u00e4 n\u00e4it\u00e4 taulukkoarvoja 50%:ll\u00e4, kun suunnittelet tuotantoa varten.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. Muita k\u00e4yt\u00e4nn\u00f6n huomioita kuparista johtimena<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Jos k\u00e4yt\u00e4t kuparifoliota pitk\u00e4n\u00e4 nauhajohtimena, sinun on tarkistettava sen virtakapasiteetti. Otetaan esimerkiksi tyypillinen paksuus <strong>0,03 mm (30 \u03bcm)<\/strong>. Jos kupariliuskan leveys on W (mm) ja pituus L (mm), tasavirtavastus voidaan arvioida likim\u00e4\u00e4r\u00e4isesti seuraavasti: R \u2248 0,0005 \u00d7 L \/ W (ohmia) T\u00e4m\u00e4 kaava antaa nopean arvion suunnittelun tarkastuksia varten.<\/li>\n\n\n\n<li>Kuparivirtakapasiteetti riippuu my\u00f6s piirilevyn osista, osien m\u00e4\u00e4r\u00e4st\u00e4 ja tyypist\u00e4 sek\u00e4 j\u00e4\u00e4hdytyksest\u00e4. Todellinen virtakapasiteetti riippuu siis sek\u00e4 kuparin geometriasta ett\u00e4 l\u00e4mp\u00f6olosuhteista.<\/li>\n\n\n\n<li>K\u00e4yt\u00e4nn\u00f6n nyrkkis\u00e4\u00e4nt\u00f6 on: virran kapasiteetti \u2248 0,15 \u00d7 W (A). T\u00e4m\u00e4 on empiirinen arvio, jota k\u00e4ytet\u00e4\u00e4n joissakin tapauksissa. Se on yksinkertainen ja konservatiivinen monille levyille.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">6. Esimerkki: pinta-ala ja virrantiheys<\/h2>\n\n\n\n<p>Otetaan yleinen tapaus: kuparin paksuus <strong>35 \u03bcm<\/strong> ja j\u00e4ljen leveys <strong>1 mm<\/strong>. Poikkipinta-ala on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pinta-ala = paksuus \u00d7 leveys = 0,035 mm \u00d7 1 mm = 0,035 mm\u00b2.<\/li>\n<\/ul>\n\n\n\n<p>Jos k\u00e4ytet\u00e4\u00e4n virrantiheyden s\u00e4\u00e4nt\u00f6\u00e4 <strong>30 A\/mm\u00b2<\/strong>, niin virta 1 mm:n leveytt\u00e4 kohti \u2248 30 \u00d7 0,035 = 1,05 A. Eli suurin piirtein 1 A mm:n j\u00e4ljen leveytt\u00e4 kohti t\u00e4m\u00e4n nyrkkis\u00e4\u00e4nn\u00f6n mukaan.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7. IPC-kaavat tarkempaa virran ja l\u00e4mp\u00f6tilan nousua varten.<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.electronics.org\/TOC\/IPC-2152.pdf\" target=\"_blank\" rel=\"noopener\">IPC-2152<\/a> ja <a href=\"https:\/\/standards.globalspec.com\/std\/155369\/ipc-d-275\" data-type=\"link\" data-id=\"https:\/\/standards.globalspec.com\/std\/155369\/ipc-d-275\" target=\"_blank\" rel=\"noopener\">IPC-D-275<\/a> antaa tarkempia malleja. Teksti sis\u00e4lt\u00e4\u00e4 IPC-D-275-kaavat yleisess\u00e4 muodossa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sis\u00e4isi\u00e4 j\u00e4lki\u00e4 varten: I = 0,0150 \u00d7 (\u0394T^0,5453) \u00d7 (A^0,7349)<\/li>\n\n\n\n<li>Ulkoisia j\u00e4lki\u00e4 varten: I = 0,0647 \u00d7 (\u0394T^0,4281) \u00d7 (A^0,6732)<\/li>\n<\/ul>\n\n\n\n<p>N\u00e4iss\u00e4 kaavoissa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>I on virta ampeereina.<\/li>\n\n\n\n<li>\u0394T on sallittu l\u00e4mp\u00f6tilan nousu \u00b0C:ssa.<\/li>\n\n\n\n<li>A on poikkipinta-ala millimetrein\u00e4\u00b2 (tai muissa yksik\u00f6iss\u00e4 riippuen siit\u00e4, miten kaavaa sovelletaan). K\u00e4yt\u00e4 kaavoja soveltaessasi johdonmukaisia yksik\u00f6it\u00e4.<\/li>\n<\/ul>\n\n\n\n<p>K\u00e4yt\u00e4 IPC-menetelmi\u00e4, jos tarvitset tarkan sallitun virran tietylle l\u00e4mp\u00f6tilan nousulle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8. Kuparin paksuus ja dielektrinen sovitus<\/h2>\n\n\n\n<p>PCB-suunnittelussa \u201ckuparin paksuus - dielektrinen sovitus\u201d tarkoittaa, ett\u00e4 valitset kuparin paksuuden ja levyn dielektrisen yhdess\u00e4. N\u00e4in vastataan s\u00e4hk\u00f6isiin, l\u00e4mp\u00f6- ja mekaanisiin tarpeisiin. T\u00e4rkeimm\u00e4t kohdat:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8.1 Kuparin paino (kuparin paksuus)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Yksikk\u00f6: oz\/ft\u00b2 (esimerkiksi 0,5 oz, 1 oz, 2 oz, 3 oz).<\/li>\n\n\n\n<li>1 oz \u2248 35 \u03bcm \u2248 1,35 mil.<\/li>\n\n\n\n<li>Vaikutukset:\n<ul class=\"wp-block-list\">\n<li>Virransieto: paksumpi kupari johtaa enemm\u00e4n virtaa.<\/li>\n\n\n\n<li>H\u00e4vi\u00f6: korkeilla taajuuksilla ihovaikutuksella on merkityst\u00e4. Paksumpi kupari voi joissakin tapauksissa v\u00e4hent\u00e4\u00e4 johtimen h\u00e4vi\u00f6it\u00e4.<\/li>\n\n\n\n<li>L\u00e4mp\u00f6: paksumpi kupari auttaa l\u00e4mm\u00f6n levi\u00e4mist\u00e4.<\/li>\n\n\n\n<li>Sy\u00f6vytys: paksumpi kupari vaikeuttaa hienosy\u00f6vytyst\u00e4. J\u00e4ljen v\u00e4himm\u00e4isleveys ja -v\u00e4li voivat kasvaa.<\/li>\n\n\n\n<li>Kustannukset: paksumpi kupari maksaa enemm\u00e4n.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.2 Dielektrinen materiaali<\/h3>\n\n\n\n<p>T\u00e4rkeimm\u00e4t dielektriset ominaisuudet:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dielektrisyysvakio (Dk tai \u03b5r): vaikuttaa signaalin nopeuteen ja impedanssiin.<\/li>\n\n\n\n<li>H\u00e4vi\u00f6tangentti (Df): vaikuttaa suurtaajuush\u00e4vi\u00f6ihin.<\/li>\n\n\n\n<li>Paksuus (H): kuparin paksuus, H ratkaisee impedanssin ja kapasitanssin.<\/li>\n\n\n\n<li>CTE ja Tg: terminen luotettavuus.<br>Yleiset materiaalit: <strong>fr4<\/strong> yleisk\u00e4ytt\u00f6\u00f6n, korkean Tg fr4:n ja erityisten korkeataajuuksisten materiaalien (esim. Rogers) k\u00e4ytt\u00f6\u00f6n.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.3 T\u00e4sm\u00e4ytyss\u00e4\u00e4nn\u00f6t<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Impedanssin s\u00e4\u00e4t\u00f6\u00e4 varten yleinen mikroliuska kaava on: Z0 \u2248 (87 \/ sqrt(\u03b5r_eff + 1,41)) * ln(5,98H \/ (0,8W + T)) miss\u00e4 Z0 on impedanssi, \u03b5r_eff on efektiivinen dielektrisyysvakio, H on dielektrisen materiaalin paksuus, W on johtimen leveys, T on kuparin paksuus.<\/li>\n\n\n\n<li>Jos kuparin paksuus kasvaa, impedanssi laskee samalla leveydell\u00e4 ja dielektrisell\u00e4. Sinun on siis kasvatettava leveytt\u00e4 tai kasvatettava dielektrisen paksuutta, jotta impedanssi pysyy samana.<\/li>\n\n\n\n<li>Korkeataajuisten signaalien osalta ihon syvyydell\u00e4 on merkityst\u00e4. Kuparin paksuuden tulisi olla v\u00e4hint\u00e4\u00e4n useita kertoja suurempi kuin ihon syvyys korkeimmalla kiinnostavalla taajuudella. Hyvin korkeilla taajuuksilla my\u00f6s pinnan karheudella on merkityst\u00e4. K\u00e4yt\u00e4 matalan karheuden omaavaa kuparia, jos tarvitset pieni\u00e4 h\u00e4vi\u00f6it\u00e4.<\/li>\n\n\n\n<li>K\u00e4yt\u00e4 tehotasojen ja suuren virran osalta paksumpaa kuparia (\u2265 2 oz) ja harkitse l\u00e4mp\u00f6\u00e4 johtavia dielektrisi\u00e4 tai metalliydinlevyj\u00e4 l\u00e4mm\u00f6nhallintaa varten.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.4 Valmistettavuus<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Paksu kupari (\u2265 3 oz) tarvitsee suurempia j\u00e4lki-\/v\u00e4lis\u00e4\u00e4nt\u00f6j\u00e4 sy\u00f6vytysongelmien v\u00e4ltt\u00e4miseksi.<\/li>\n\n\n\n<li>Ohuet dielektriset aineet edellytt\u00e4v\u00e4t kuparin paksuuden tiukkaa hallintaa. Vaihtelut vaikuttavat impedanssiin.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">9. Valintataulukko (lyhyt opas)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Sovellusskenaario<\/th><th>Suositeltu kuparin paino<\/th><th>Suositeltu dielektrinen materiaali<\/th><th>Vastaava syy<\/th><\/tr><\/thead><tbody><tr><td>Nopea digitaalinen (&gt;5 Gbps)<\/td><td>0,5 oz - 1 oz<\/td><td>low-Df FR4 \/ <a href=\"https:\/\/www.rogerscorp.com\/advanced-electronics-solutions\/ro4000-series-laminates\" target=\"_blank\" rel=\"noopener\">Rogers RO4000<\/a><\/td><td>Hieno reititys, alhainen h\u00e4vi\u00f6, helpompi impedanssin s\u00e4\u00e4t\u00f6.<\/td><\/tr><tr><td>Tehomoduulit \/ suuri virta<\/td><td>2 oz - 6 oz+<\/td><td><a href=\"https:\/\/flj-pcb.com\/fi\/fr-4-pcb-guide-properties-limits-material-choices\/\" data-type=\"post\" data-id=\"4641\">FR4<\/a> Korkean Tg:n \/ korkean l\u00e4mm\u00f6njohtavuuden materiaalit<\/td><td>Suurempi virtakapasiteetti ja parempi l\u00e4mm\u00f6nsiirto.<\/td><\/tr><tr><td>RF \/ mikroaallot (&gt;10 GHz)<\/td><td>0,5 oz (alhainen karheus)<\/td><td><a href=\"https:\/\/www.rogerscorp.com\/advanced-electronics-solutions\/ro3000-series-laminates\" target=\"_blank\" rel=\"noopener\">Rogers RO3000<\/a> \/ <a href=\"https:\/\/flj-pcb.com\/fi\/pcb-substrate-classification-and-material-properties\/\" data-type=\"post\" data-id=\"4685\">Teflon (PTFE)<\/a><\/td><td>Eritt\u00e4in alhainen h\u00e4vi\u00f6 ja optimoidut pintaefektit RF:lle.<\/td><\/tr><tr><td>Yleinen kulutuselektroniikka<\/td><td>1 oz<\/td><td>standardi FR4<\/td><td>Tasapainoiset kustannukset ja kyps\u00e4 prosessi.<\/td><\/tr><tr><td>Suuritiheyksiset HDI-levyt<\/td><td>0,5 oz - 1 oz<\/td><td>FR4 Korkean Tg:n \/ matalan CTE:n materiaalit<\/td><td>Hienot j\u00e4ljet ja luotettava laserin kautta suorituskyky.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">10. K\u00e4yt\u00e4nn\u00f6n neuvoja<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Ilmoita ensin tarpeesi: virta, signaalin nopeus, impedanssi, l\u00e4mp\u00f6.<\/li>\n\n\n\n<li>Suunnittele pinoaminen oikeilla ty\u00f6kaluilla.<\/li>\n\n\n\n<li>Tee impedanssisimulointi materiaalin Dk ja kuparin paksuuden kanssa.<\/li>\n\n\n\n<li>Kysy levyvalmistajalta sen kuparin paksuuden toleransseista ja dielektrisist\u00e4 vaihtoehdoista.<\/li>\n\n\n\n<li>Korkeataajuustapauksissa mitataan materiaalit Dk ja Df, jos mahdollista.<\/li>\n<\/ol>\n\n\n\n<p><strong>Huom:<\/strong> Kuparin nimellispaino (kuten 1 oz) on l\u00e4ht\u00f6paksuus ennen sy\u00f6vytyst\u00e4. Sy\u00f6vytyksen j\u00e4lkeen j\u00e4lki voi olla kapenevilla sivuilla. K\u00e4yt\u00e4 todellisia impedanssitarkastuksia varten joko keskim\u00e4\u00e4r\u00e4ist\u00e4 paksuutta tai levytalon ohjeistusta.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>1. What is copper foil? Copper foil is a thin, continuous metal sheet. It is an electro-deposited, negative-type material. The 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