Category:PCB PCB Manufacturing

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PCB manufacturing consists of many steps, such as PCB CAM, Panelization, Copper patterning, etc. This group is mainly talked about the problems during PCB manufacturing!

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How does E-Test at a PCB Fab work? Reply 2016-11-18 15:50:53
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bankroot

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When I choose a PCB fab house, there often comes the choice of E-testing, so I gather it is an electrical test to test all the connections. But how do they do it? They test only by gerbers? And surely it is done by machine?
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Statement: This post is only the personal view of the author and does not represent the opinions of ALLPCB.com.

Micha.R

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"Bed of nails" is also a kind of testing way. This measures the resistance or conductance from locations on the PCB board surface to other points on the surface. From the Gerber files they know where there should be conductance and where there should be opens.

Jan Cwiecek

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The PCB fab extract a pad-list and netlist from the gerbers, and then have a machine with robotic arms carrying test-probes, which is called Flying Probes to manually ohm-out all the connected nets.

rlb-designs

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E-testing is primarily used to detect bad plated holes, as this is the most common failure as it's more process-sensitive.

Jana Velicova

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Great work. I really appreciate it.
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