Hi All,
I'm a technique supporter of fixture house.
Recently, we had more and more complains from our customers on VTEP applications.
The sensed value were very low to 5 around mostly, not only on BGAs, also on DIP connectors, TSSOP, SOT, QFN IC packages, etc. We have checked the sensor plates, mux cards, amplifiers, all of them were verified ok. This is really a headache problem, which was frequently happened in our application and service fields.
As I know, many factors may cause this problem, such as the noise of probes around DUT, electromagnetic effects, shapes of sensor plates, degree of coupling, even the wrong topology of board definition may lead IPG run incorrect testjet files. Besides all the hardwares and factors I mentioned above, what else may cause this problem? Any measures or techniques could be taken to avoid this happening? I appreciate your helps and discussions on this topic, thanks.
Bin
I'm a technique supporter of fixture house.
Recently, we had more and more complains from our customers on VTEP applications.
The sensed value were very low to 5 around mostly, not only on BGAs, also on DIP connectors, TSSOP, SOT, QFN IC packages, etc. We have checked the sensor plates, mux cards, amplifiers, all of them were verified ok. This is really a headache problem, which was frequently happened in our application and service fields.
As I know, many factors may cause this problem, such as the noise of probes around DUT, electromagnetic effects, shapes of sensor plates, degree of coupling, even the wrong topology of board definition may lead IPG run incorrect testjet files. Besides all the hardwares and factors I mentioned above, what else may cause this problem? Any measures or techniques could be taken to avoid this happening? I appreciate your helps and discussions on this topic, thanks.
Bin
Have you seen the documents they posted on the webpage http://www.agilent.com/see/vtep ?
There's a best practice doc i uploaded here. Also there're design files for a VTEP verifier too specially for fixture vendors to verify the hw prior to shipment w/o needing a 3070.