... and should contain the following information to ensure that the finished board is to your requirements. - Always required even when a drill file | MULTILAYER CIRCUIT BOARDS SUPPLIERS | is supplied, to enable inspection of panels immediately after drilling and finished boards prior to despatching. Hole sizes must be clearly represented with distinct differences | MULTILAYER CIRCUIT BOARDS SUPPLIERS | between each size. Tolerances are not required unless different to our standard of +0.1 / -0.05 mm. - Preferred with overall mechanical dimensions including notches, | MULTILAYER CIRCUIT BOARDS SUPPLIERS | cutouts and slots. Also preferred is a positioning (datum) dimension (drilled hole is best). Tolerances are not required unless different to our standard of + | MULTILAYER CIRCUIT BOARDS SUPPLIERS | / -0.25 mm. Other information required for all boards includes: board thickness (standard = 1.6mm) base copper thickness (std = 18mm) solder mask colour (std | MULTILAYER CIRCUIT BOARDS SUPPLIERS | = green) solder mask type (std = liquid photoimageable) component legend colour (std = white) bare board testing requirement (std for multilayer and fine line | MULTILAYER CIRCUIT BOARDS SUPPLIERS | production runs) Extra ...
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... | Breakdown A complete failure of a dielectric material characterized by a disruptive electrical discharge through the material due to a sudden and large | MULTILAYER CIRCUIT BOARDS SUPPLIERS | increase in voltage. | DIELECTRIC STRENGTH | The maximum voltage that an insulating material can withstand before breakdown occurs. | DIGITAL CIRCUIT | A circuit | MULTILAYER CIRCUIT BOARDS SUPPLIERS | comprised of mostly integrated circuits which operates like a switch(i.e., it is either "ON" or "OFF"). | DIGITIZING | The process of reducing feature locations | MULTILAYER CIRCUIT BOARDS SUPPLIERS | on a flat plane to digital representation of X-Y coordinates. | DIMENSIONAL HOLE | A hole in a printed board where the means of determining | MULTILAYER CIRCUIT BOARDS SUPPLIERS | location is by coordinate values not necessarily coinciding with the stated grid. | DIMENSIONAL STABILITY | A freedom from distortion caused by such factors as | MULTILAYER CIRCUIT BOARDS SUPPLIERS | temperature, humidity, chemical treatment, age, or stress. | DIP SOLDERING | A process whereby printed boards are brought in contact with the surface of a | MULTILAYER CIRCUIT BOARDS SUPPLIERS | static pool of molten solder for the purpose of ...
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... synthetic sheets positioned above each other and fitted with control pins. An adaptor programme must be written to reflect the actual holes in each | MULTILAYER CIRCUIT BOARDS SUPPLIERS | individual synthetic layer of the adaptor. The pin positions are identical to the control points enabling an overall PCB test within seconds. The control adaptors | MULTILAYER CIRCUIT BOARDS SUPPLIERS | are all the more expensive the higher the density and the lower the grid distances between control points. The adaptors can also only be used | MULTILAYER CIRCUIT BOARDS SUPPLIERS | for one specific type of PCB which explains the high set-up costs for the test. FLYING PROBE TEST: As PCB series are not always produced | MULTILAYER CIRCUIT BOARDS SUPPLIERS | in mass, the flying probe test was developed as an alternative solution for small or medium-sized series. Manoeuverable probes move to the control points without | MULTILAYER CIRCUIT BOARDS SUPPLIERS | necessitating an adaptor. As the points are checked individually, the time required for a complete check depends on the number of test points. In extremely | MULTILAYER CIRCUIT BOARDS SUPPLIERS | complex layouts the test can take up to 30 minutes. Electrical testing of PCBs is ...
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