The ratio of the board thickness to the smallest drilledhole. The ratio of the PCB thickness to the diameter of thesmallest hole. The photographic image of the PCB pattern on film used toproduce the circuit board, usually on a 1:1 scale.
(Acceptance Quality Level): The maximum number of defectiveslikely to exist within a population (lot)that can be considered to becontractually tolerable, normally associated with statistically derived sampling plans.Ī group of elements or circuits arranged in rows and columnson a base material. Instrumental in locating"open" traces, missing features or "shorts". The machine uses cam data to verify copper feature positioning, size and shape. (Automated Optical Inspection): Automatic laser/videoinspection of traces and pads on the surface of inner layer cores or outerlayer panels. Assembly File: A drawingdescribing the locations of components on a PCB. This report is not necessary if your files are saved as Extended Gerber with embedded Apertures(RS274X).Ī list of the shapes and sizes for describing the pads and tracks used to create a layer of a circuit board. This is a text file describing the size and shape of each element on the board. This process issubject to human error and is one of theĭisadvantages of vector photoplotter as compared with laser photoplotter. In preparation for a photoplotting, the aperture wheel is set up by a technician who reads a printedaperture list, selects the correct aperture from a set of them stored in a box with compartments and, using a small screw driver, installs the aperture on to the position on the wheel which is called for on the list.
DIPTRACE LAY OUT TRACE STRAIGHT CODE
When a D code denoting aparticular position on the wheel is retrieved from a Gerber file by thephotoplotter, the wheel is caused to rotate so that the aperture in thatpositionis placed between the lamp and the film. Its center hole is attached to a motorized spindle on the lamp head of the photoplotter.
The index of the apertureis its Position (a number used in an aperture list to identify an aperture) orD code.Ī component of a vector photoplotter, it is a metal disk having cut outs with brackets and screw holes arranged near its rim for attaching apertures. 002ö) annularring, at trace junction (required by IPC: A: 600).Īn electrical circuit that provides a continuous quantitative output as a response from its input.Īn indexed shape with a specified x and y dimension, or line type with a specified width, used as a basic element or object by a photoplotter in plotting geometric patterns on film. They allow for any drill wander and / or Image shift during manufacturing and will help keep a healthy (over. Designer tip: Try using teardrop shaped pads. The pad area that remains after a hole is drilled through the pad. The surrounding environment coming into contact with the system or component in question Annular Ring: The width of the conductor pad surrounding a drilled hole. It can withstandĬontinuously with high temperatures and has a low dielectricloss over a wide frequency range. The minimum distance between features pad - pad, pad - traces and trace - traceĪ ceramic used for insulators in electron tubes or substrates in thin film circuits. Examples ofĪctive devices: transistors, rectifiers, diodes, amplifiers,oscillators, mechanical relays.ĭeposition or addition of conductive material on clad or unclad base material.Īluminum Nitride, a compound of aluminum with nitrogen. A treatment that renders non-conductive material receptive to electroless deposition.Ī device that requires an external source of power to operate up on its input signal(s).
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