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Atg delivers flying probe tester for substrates

Posted: 02 Apr 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Printed circuit board? substrate tester?

Atg Luther & Maelzer distributed its flying probe system for substrate test to a major customer in Korea. The S3 10?m Substrate Tester enables positioning accuracy and high number of contact points through flying probe technology.

Substrates are used to enable a connection between a semiconductor and a printed circuit board. A characteristic test panel consists of about 50-100 single substrates and is approximately 250mm x 80mm in size. For electrical testing, it is necessary to contact all end points of the product. Each substrate has about 1,000-2,000 test points. So on one product about 100,000 pads need to be contacted. For testing substrates on the semiconductor side, structures down to 10?m have to be reliably contacted.

S3 10?m Substrate Tester

The S3 deploys four freely moveable test heads and achieves a test rate of 100 measurements per second. The test heads contact the test product from above and execute a capacitance measurement against a vacuum table. The capacitance result indicates opens and shorts in the substrates.

Prior to electrical test, an optical alignment of the test sample correlates the shrinkage and offset of the finished product with the testing data and adjusts automatically. A 5Mpx colour camera with a resolution of 1.2?m ensures positioning accuracy of 1.5?m.

The S3 works with a micro needle. The contacting pressure of this micro needle can be adjusted from 0.3g up to 2.5g to ensure best test yield and repeatability without damaging the contact pads. The maximum test area of the substrate tester S3 is 310mm x 300mm.

"Today's established systems work with two test heads and achieve test rates of around 30 measurements per second. With its four test heads architecture the S3 achieves more than three times this speed. We expect that this high throughput capability will enable testing of higher quantities of substrate boards with flying probe test systems in the future," said Jochen Kleinertz, vice president PCB Test Group at Xcerra.

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