{"id":36200,"date":"2026-09-17T16:40:51","date_gmt":"2026-09-17T08:40:51","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/?p=36200"},"modified":"2026-09-17T16:43:13","modified_gmt":"2026-09-17T08:43:13","slug":"pcb-test-coupons","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/","title":{"rendered":"PCB Test Coupons: Types, Testing &#038; IPC Guide"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#What_Is_a_PCB_Test_Coupon\" >What Is a PCB Test Coupon?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#Why_Are_Test_Coupons_Used_Instead_of_Testing_the_Production_PCB\" >Why Are Test Coupons Used Instead of Testing the Production PCB?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#What_Types_of_PCB_Test_Coupons_Are_Commonly_Used\" >What Types of PCB Test Coupons Are Commonly Used?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#What_Can_PCB_Test_Coupons_Verify\" >What Can PCB Test Coupons Verify?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#Where_Are_Test_Coupons_Located_on_a_PCB_Panel\" >Where Are Test Coupons Located on a PCB Panel?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#How_Are_Impedance_Test_Coupons_Tested_with_TDR\" >How Are Impedance Test Coupons Tested with TDR?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#How_Are_Test_Coupons_Used_for_Microsection_and_Via_Inspection\" >How Are Test Coupons Used for Microsection and Via Inspection?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#Who_Should_Design_PCB_Test_Coupons%E2%80%94the_Designer_or_the_Fabricator\" >Who Should Design PCB Test Coupons\u2014the Designer or the Fabricator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#What_Test_Coupon_Requirements_Should_You_Include_in_Your_PCB_RFQ\" >What Test Coupon Requirements Should You Include in Your PCB RFQ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#FAQ_About_PCB_Test_Coupons\" >FAQ About PCB Test Coupons<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/#Ready_to_Review_Your_PCB_Test_Coupon_Requirements\" >Ready to Review Your PCB Test Coupon Requirements?<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div><p><a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/\">PCB test coupons<\/a> are representative test structures placed on the same fabrication panel as the production boards. They are built with the same materials, copper plating, lamination, drilling, and other key processes so manufacturers can verify characteristics such as controlled impedance, plated-hole quality, via reliability, registration, and solderability without cutting into the finished PCB.<\/p>\n<p>Different PCB test coupons serve different purposes. Impedance coupons are commonly checked with TDR, while structural coupons can be microsectioned to inspect plating and internal alignment. The coupon design should reflect the actual production stackup and fabrication process.<\/p>\n<figure style=\"width: 100%; max-width: 600px; margin: 24px auto 28px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 600px; max-height: 400px; height: auto; object-fit: contain; display: block; margin: 0 auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/p243r3-pcb-test-coupons-1.jpg\" alt=\"PCB test coupons integrated into the panel rail of a production PCB panel\" data-first-enter-image=\"true\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_a_PCB_Test_Coupon\"><\/span>What Is a PCB Test Coupon?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A PCB test coupon is a dedicated test structure manufactured on the same panel as the production PCB to represent selected features of the finished board.<\/p>\n<p>Unlike the functional PCB, the coupon is created specifically for inspection or measurement. Depending on the requirement, it may reproduce:<\/p>\n<ul>\n<li>Controlled-impedance traces<\/li>\n<li>Plated through holes<\/li>\n<li>Microvias or blind vias<\/li>\n<li>Internal layer registration features<\/li>\n<li>Copper plating structures<\/li>\n<li>Solderability features<\/li>\n<\/ul>\n<p>The key point is representation. A useful coupon should experience the same relevant fabrication processes as the board it is intended to represent.<\/p>\n<p>PCB test coupons are commonly placed in the panel rail or other non-product area, so testing does not consume a usable PCB.<\/p>\n<p>At EBest Circuit, coupon requirements can be reviewed together with the production stackup during DFM. For controlled-impedance, HDI, RF, or high-reliability boards, this helps keep the test structure aligned with the <a href=\"https:\/\/www.bestpcbs.com\/manufacturing\/pcb-manufacturing.htm\">actual PCB manufacturing conditions<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_Are_Test_Coupons_Used_Instead_of_Testing_the_Production_PCB\"><\/span>Why Are Test Coupons Used Instead of Testing the Production PCB?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCB test coupons allow measurements and destructive inspections to be performed without damaging the production board.<\/p>\n<p>Some verification methods cannot be carried out conveniently on a finished PCB. Microsection analysis, for example, requires the sample to be cut, mounted, polished, and inspected under magnification.<\/p>\n<p>Coupons also provide a more consistent structure for tests such as TDR because production routing may contain:<\/p>\n<ul>\n<li>Vias<\/li>\n<li>Pads<\/li>\n<li>Connectors<\/li>\n<li>BGA breakouts<\/li>\n<li>Plane changes<\/li>\n<li>Short trace segments<\/li>\n<\/ul>\n<p>These features can make measurement results harder to interpret.<\/p>\n<p>A dedicated coupon can reproduce the required stackup and trace geometry while providing enough length and accessible test points for repeatable measurement.<\/p>\n<p>The coupon therefore does not replace electrical or functional testing of the PCB. It provides process evidence for specific fabrication characteristics.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Types_of_PCB_Test_Coupons_Are_Commonly_Used\"><\/span>What Types of PCB Test Coupons Are Commonly Used?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCB test coupon types are usually selected according to what needs to be verified rather than by using one universal coupon design.<\/p>\n<div class=\"wp-block-table\" style=\"max-width: 100%; overflow-x: auto;\">\n<table>\n<thead>\n<tr>\n<th>Coupon \/ Test Structure<\/th>\n<th>What It Checks<\/th>\n<th>Typical Test Method<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Impedance coupon<\/td>\n<td>Single-ended or differential impedance<\/td>\n<td>TDR<\/td>\n<\/tr>\n<tr>\n<td>PTH structural coupon<\/td>\n<td>Hole wall plating and registration<\/td>\n<td>Microsection<\/td>\n<\/tr>\n<tr>\n<td>Via reliability coupon<\/td>\n<td>Via or interconnect integrity<\/td>\n<td>Thermal stress \/ resistance monitoring<\/td>\n<\/tr>\n<tr>\n<td>Microvia coupon<\/td>\n<td>HDI microvia quality and stacking<\/td>\n<td>Microsection \/ reliability test<\/td>\n<\/tr>\n<tr>\n<td>Solderability coupon<\/td>\n<td>Solder wetting performance<\/td>\n<td>Solderability test<\/td>\n<\/tr>\n<tr>\n<td>Peel-strength coupon<\/td>\n<td>Copper adhesion<\/td>\n<td>Peel test<\/td>\n<\/tr>\n<tr>\n<td>SIR coupon<\/td>\n<td>Surface insulation resistance<\/td>\n<td>Electrical resistance testing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Some IPC qualification and conformance structures use letter-based coupon designations. However, for most PCB buyers and engineers, the more useful question is not the letter itself but what manufacturing characteristic the coupon is intended to verify.<\/p>\n<figure style=\"width: 100%; max-width: 600px; margin: 24px auto 28px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 600px; max-height: 400px; height: auto; object-fit: contain; display: block; margin: 0 auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/p243r3-pcb-test-coupon-types.jpg\" alt=\"Common PCB test coupon types including impedance plated through-hole microvia via reliability solderability and SIR coupons\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_Can_PCB_Test_Coupons_Verify\"><\/span>What Can PCB Test Coupons Verify?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCB test coupons can verify several manufacturing characteristics that are difficult to confirm from visual inspection alone.<\/p>\n<p>Common checks include:<\/p>\n<ul>\n<li>Controlled impedance<\/li>\n<li>Copper plating thickness<\/li>\n<li>Plated through-hole integrity<\/li>\n<li>Microvia quality<\/li>\n<li>Annular ring condition<\/li>\n<li>Internal layer registration<\/li>\n<li>Solderability<\/li>\n<li>Copper adhesion<\/li>\n<li>Interconnect reliability<\/li>\n<\/ul>\n<p>For example, an impedance coupon can confirm whether a nominal 50 \u03a9 or 100 \u03a9 structure is within tolerance after lamination, plating, and etching.<\/p>\n<p>A microsection coupon serves a different purpose. It allows the manufacturer to inspect the actual cross-section of a plated hole or via and evaluate conditions such as copper distribution, registration, and interface quality.<\/p>\n<figure style=\"width: 100%; max-width: 600px; margin: 24px auto 28px;\"><img loading=\"lazy\" decoding=\"async\" style=\"width: 100%; max-width: 600px; max-height: 400px; height: auto; object-fit: contain; display: block; margin: 0 auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/p243r3-pcb-test-coupon-verification.jpg\" alt=\"PCB test coupon illustrating impedance trace geometry plating via quality and layer registration verification\" width=\"600\" height=\"400\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Where_Are_Test_Coupons_Located_on_a_PCB_Panel\"><\/span>Where Are Test Coupons Located on a PCB Panel?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCB test coupons are usually placed in the panel rail or another non-functional area of the production panel.<\/p>\n<p>This position allows the coupon to travel through the same major fabrication processes as the PCBs while remaining separate from the customer\u2019s usable board outline.<\/p>\n<p>A useful coupon should be positioned so that it represents the production process as closely as practical, especially for:<\/p>\n<ul>\n<li>Lamination<\/li>\n<li>Drilling<\/li>\n<li>Copper plating<\/li>\n<li>Etching<\/li>\n<li>Surface treatment<\/li>\n<\/ul>\n<p>Coupon placement also needs to leave enough room for test access, sectioning, or removal from the panel.<\/p>\n<p>For controlled-impedance production, the coupon is typically designed around the same layer pair, dielectric thickness, copper condition, and trace geometry used by the actual impedance-controlled routing.<\/p>\n<figure style=\"width: 100%; max-width: 600px; margin: 24px auto 28px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 600px; max-height: 400px; height: auto; object-fit: contain; display: block; margin: 0 auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/p243r3-pcb-test-coupon-location-panel.jpg\" alt=\"PCB panel showing test coupons located in the top and bottom panel rails\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"How_Are_Impedance_Test_Coupons_Tested_with_TDR\"><\/span>How Are Impedance Test Coupons Tested with TDR?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>An impedance test coupon reproduces the controlled-impedance structure of the production PCB so its characteristic impedance can be measured with time-domain reflectometry, or TDR.<\/p>\n<p>The coupon normally represents the same:<\/p>\n<ul>\n<li>Signal layer<\/li>\n<li>Reference plane<\/li>\n<li>Dielectric thickness<\/li>\n<li>Copper thickness<\/li>\n<li>Trace width<\/li>\n<li>Differential spacing, where applicable<\/li>\n<li>Material system<\/li>\n<\/ul>\n<p>During TDR testing, a fast electrical edge is launched into the coupon. The instrument measures reflections along the transmission line and converts them into an impedance profile.<\/p>\n<p>The result is then compared with the specified target, such as:<\/p>\n<ul>\n<li>50 \u03a9 single-ended<\/li>\n<li>90 \u03a9 differential<\/li>\n<li>100 \u03a9 differential<\/li>\n<\/ul>\n<p>A typical tolerance may be \u00b110%, although tighter limits can be specified.<\/p>\n<p>The coupon should be based on the final production stackup rather than only the original CAD trace width. Plating, etching, dielectric thickness, and manufacturing compensation can all change the finished impedance.<\/p>\n<figure style=\"width: 100%; max-width: 600px; margin: 24px auto 28px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 600px; max-height: 400px; height: auto; object-fit: contain; display: block; margin: 0 auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/p243r3-pcb-impedance-coupon-tdr-testing.jpg\" alt=\"PCB impedance test coupon connected to TDR equipment for controlled impedance verification\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"How_Are_Test_Coupons_Used_for_Microsection_and_Via_Inspection\"><\/span>How Are Test Coupons Used for Microsection and Via Inspection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Microsection coupons are cut and polished so the internal PCB structure can be inspected directly under magnification.<\/p>\n<p>This method is commonly used to evaluate plated through holes, blind vias, microvias, and multilayer registration.<\/p>\n<p>A typical microsection can reveal:<\/p>\n<ul>\n<li>Hole-wall copper thickness<\/li>\n<li>Copper distribution<\/li>\n<li>Annular ring condition<\/li>\n<li>Layer-to-hole registration<\/li>\n<li>Resin condition<\/li>\n<li>Via interfaces<\/li>\n<li>Microvia geometry<\/li>\n<li>Lamination quality<\/li>\n<\/ul>\n<p>Because the coupon is intentionally sacrificed, the production PCB remains intact.<\/p>\n<p>For HDI boards, microsection inspection is especially useful because microvias, stacked structures, and thin dielectric layers can create manufacturing risks that are not visible from the board surface.<\/p>\n<p>Microsection results should be interpreted against the relevant drawing, customer specification, and applicable IPC acceptance requirements rather than treated as a generic pass\/fail image.<\/p>\n<figure style=\"width: 100%; max-width: 600px; margin: 24px auto 28px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 600px; max-height: 400px; height: auto; object-fit: contain; display: block; margin: 0 auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/p243r3-pcb-microsection-via-inspection.jpg\" alt=\"PCB microsection showing plated through hole microvia copper layers annular ring and resin\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Who_Should_Design_PCB_Test_Coupons%E2%80%94the_Designer_or_the_Fabricator\"><\/span>Who Should Design PCB Test Coupons\u2014the Designer or the Fabricator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCB test coupon design is typically a shared responsibility: the PCB designer defines the electrical and reliability requirements, while the fabricator finalizes the coupon structure for the actual production process.<\/p>\n<p>The customer should provide requirements such as:<\/p>\n<ul>\n<li>Target impedance<\/li>\n<li>Impedance tolerance<\/li>\n<li>Stackup constraints<\/li>\n<li>Material requirement<\/li>\n<li>Via structure<\/li>\n<li>Reliability requirement<\/li>\n<li>Required reports or inspection records<\/li>\n<\/ul>\n<p>The fabricator then knows the actual production details, including dielectric availability, drill size, finished copper thickness, plating allowance, and etching compensation.<\/p>\n<p>For that reason, it is often better for the PCB manufacturer to create or adjust the coupon after the production stackup is confirmed.<\/p>\n<p>If a customer-supplied coupon is included in the fabrication data, it should still be reviewed during DFM to make sure it matches the manufacturing stackup and test method.<\/p>\n<figure style=\"width: 100%; max-width: 600px; margin: 24px auto 28px;\"><img decoding=\"async\" style=\"width: 100%; max-width: 600px; max-height: 400px; height: auto; object-fit: contain; display: block; margin: 0 auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/p243r3-pcb-test-coupon-dfm-review.jpg\" alt=\"Engineer reviewing PCB stackup impedance and test coupon requirements during DFM\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_Test_Coupon_Requirements_Should_You_Include_in_Your_PCB_RFQ\"><\/span>What Test Coupon Requirements Should You Include in Your PCB RFQ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A PCB RFQ should clearly state what needs to be verified rather than simply asking for \u201ctest coupons.\u201d<\/p>\n<p>For controlled-impedance or high-reliability projects, provide:<\/p>\n<ul>\n<li>Gerber or ODB++ files<\/li>\n<li>PCB stackup or stackup constraints<\/li>\n<li>Material grade<\/li>\n<li>Finished board thickness<\/li>\n<li>Copper weight<\/li>\n<li>Target impedance<\/li>\n<li>Single-ended or differential requirement<\/li>\n<li>Impedance tolerance<\/li>\n<li>Critical routing layers<\/li>\n<li>Via or microvia structure<\/li>\n<li>Required test reports<\/li>\n<li>Whether physical coupons should be returned<\/li>\n<\/ul>\n<p>For example, \u201c50 \u03a9 controlled impedance required\u201d is less useful than specifying the routing layer, reference plane, stackup requirement, and tolerance.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ_About_PCB_Test_Coupons\"><\/span>FAQ About PCB Test Coupons<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>1. Is a PCB test coupon part of the finished PCB?<\/strong> No. It is normally placed in the panel rail or another non-product area and removed from the production panel.<\/p>\n<p><strong>2. Do I need to include a test coupon in my Gerber files?<\/strong> Not always. In many projects, the customer provides the test requirement and the PCB manufacturer creates the coupon based on the final production stackup.<\/p>\n<p><strong>3. What is an impedance test coupon?<\/strong> It is a representative transmission-line structure used to measure the finished PCB impedance, commonly with TDR.<\/p>\n<p><strong>4. Can a test coupon prove that every PCB on the panel is good?<\/strong> No. A coupon provides representative process evidence for specific characteristics. It does not replace board-level inspection or electrical testing.<\/p>\n<p><strong>5. Are PCB test coupons normally sent to the customer?<\/strong> They can be. Whether physical coupons, TDR reports, microsection images, or other records are supplied should be defined in the order or quality requirement.<\/p>\n<p><strong>6. What information should I provide for controlled-impedance coupon testing?<\/strong> Provide the target impedance, tolerance, routing layer, reference plane, stackup, material, copper weight, and any special coupon or reporting requirements.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Ready_to_Review_Your_PCB_Test_Coupon_Requirements\"><\/span>Ready to Review Your PCB Test Coupon Requirements?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCB test coupons are most useful when they are tied to a specific manufacturing risk, whether that is impedance, plating, microvia quality, registration, or another measurable characteristic. Defining the test requirement before production makes the coupon more representative and the resulting data more useful.<\/p>\n<p>EBest Circuit supports controlled-impedance, HDI, RF, multilayer PCB manufacturing, <a href=\"https:\/\/www.bestpcbs.com\/products\/pcba.htm\">PCBA<\/a>, DFM review, TDR testing, and microsection inspection. For projects that require coupon-based verification, send your <strong>Gerber files and PCB specifications<\/strong> to <a href=\"mailto:sales@bestpcbs.com\">sales@bestpcbs.com<\/a>. Our engineering team can review the stackup, test requirements, and coupon approach before fabrication.<\/p>\n<p>After coupon results are approved, our <a href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/04\/smt-pcb-manufacturer\/\">SMT assembly<\/a> workflow can also coordinate <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/06\/circuit-board-stencil\/\">circuit board stencil<\/a> requirements with the released fabrication data.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn PCB test coupon types, locations, TDR impedance testing, microsection inspection, design responsibility, and RFQ requirements for reliable fabrication.<\/p>\n","protected":false},"author":623,"featured_media":36314,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[175,5789,16,5233],"tags":[8446,8443,8445,8444,8442],"class_list":["post-36200","post","type-post","status-publish","format-standard","hentry","category-best-pcb","category-pcb-design","category-pcb-technology","category-quality","tag-impedance-coupons","tag-pcb-test-coupon","tag-pcb-test-coupon-design","tag-pcb-test-coupon-types","tag-pcb-test-coupons"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Learn PCB test coupon types, locations, TDR impedance testing, microsection inspection, design responsibility, and RFQ requirements for reliable fabrication.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Love PCB\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/pcb-test-coupons\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"PCB &amp; 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