Hello!Welcome to www.5pcb.com
    Add favourite     Site map
                            
sales@5pcb.com               FAQs              Sign in               Create account

Drilling

Date:August 2011

 

Unpopulated boards may be subjected to a bare-board test where each circuit connection (as defined in a netlist) is verified as correct on the finished board. For high-volume production, a Bed of nails tester, a fixture or a Rigid needle adapter is used to make contact with copper lands or holes on one or both sides of the board to facilitate testing. A computer will instruct the electrical test unit to apply a small voltage to each contact point on the bed-of-nails as required, and verify that such voltage appears at other appropriate contact points. A "short" on a board would be a connection where there should not be one; an "open" is between two points that should be connected but are not. For small- or medium-volume boards, flying probe and flying-grid testers use moving test heads to make contact with the copper/silver/gold/solder lands or holes to verify the electrical connectivity of the board under test. Another method for testing is industrial CT scanning, which can generate a 3D rendering of the board along with 2D image slices and can show details such a soldered paths and connections.

 

--This article excerpt from“Wikipedia”

 

 

【Back】

        Quote Online   Capability   The company           PCB knowledge  
           Rigid PCB
          SMD-Stencils
 

Capability
Quality Guarantee

Cases

  Factory  &   Contact us
Careers  &  Payments account
Terms   &  Privacy policy
            PCB knowledge
          Links
 

Copyright © D.M.Electronic International Limited       E-mail:sales@5pcb.com    Tel:+86-755-27269685    Fax:+86-755-27220690

PC board prototype | Quote Online | custom pcb boardspcb prototyping board | Mulitlayer printed circuit board | Mulitlayer prited wiring board | Rigid printed board
Flexible printed board | PCB Online | PCB prototypes |Turnkey PCBA