In our previous post, we explained some common definitions that are used in the manufacturing of prototype printed circuit boards. Here we continue our list:<\/p>\n
Glass transition temperature: this is the temperature at which an amorphous polymer changes from a hard and brittle condition to a rubbery consistency. When this transition happens, many changes occur to the physical properties of the prototype PCBs<\/a>, including hardness, brittleness, coefficiency of thermal expansion, and\/or specific heat.<\/p>\n Ground plane: A conductor layer, which is used mainly as a reference point for circuit returns, shielding, or heat sinking.<\/p>\n Hole density: the amount of holes per unit area.<\/p>\n Impedance: the total passive opposition offered to the flow of electrical current. Generally, this term is used to describe high frequency circuit boards.<\/p>\n Jumper wire: an electrical connection formed by a wire between two points on a printed circuit board prototype after the initial conductive pattern is created.<\/p>\n Laminate: the product that is made when two or more layers are bonded together.<\/p>\n Laminate thickness: thickness of the base material before processing, not including metal-clad.<\/p>\n Land: a portion of the conductive pattern used for connection and the attachment of components to the board.<\/p>\n Mask: the material applied to the board that helps adhere the solder.<\/p>\n Measling: a condition where there are small white spots or crosses show up between the surface of the laminate. If this is noticeable, there is a separation of fibers in the glass cloth at the weave intersection.<\/p>\n Minimum Annular Ring: the minimum metal width between the circumference of the hole and the outer circumference of the land.<\/p>\n Outer layer: the top and bottom sides of any prototype PCB.<\/p>\n Pad: the portion of the conductive pattern that is meant for the mounting of components on prototype PCBs.<\/p>\n Pattern: the configuration of the conductive and non-conductive materials on the printed PCBs. This term can also be used on related tools, drawings, and masters.<\/p>\n Schematic Diagram: the drawing that shows all the connections, circuits, components, and functions of the PCB’s electronic circuit.<\/p>\n Trace thickness: a PCB’s trace thickness is measured in ounces of copper. For perspective, many PCB designers use between one and two ounces of copper for traditional boards.<\/p>\n Want to learn more? Contact our professionals at PCB Unlimited today.<\/p>\n","protected":false},"excerpt":{"rendered":" In our previous post, we explained some common definitions that are used in the manufacturing of prototype printed circuit boards. Here we continue our list: Glass transition temperature: this is the temperature at which an amorphous polymer changes from a hard and brittle condition to a rubbery consistency. When this transition happens, many changes occur Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":296,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["entry","author-pcbunlimited","post-295","post","type-post","status-publish","format-standard","has-post-thumbnail","category-pcb-fabrication"],"_links":{"self":[{"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/posts\/295","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/comments?post=295"}],"version-history":[{"count":2,"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/posts\/295\/revisions"}],"predecessor-version":[{"id":301,"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/posts\/295\/revisions\/301"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/media\/296"}],"wp:attachment":[{"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/media?parent=295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/categories?post=295"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pcbunlimited.com\/blog\/wp-json\/wp\/v2\/tags?post=295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}