Electronics Forum | Wed Jun 09 11:38:20 EDT 1999 | Roseann
In past PCB designs I have cleared all traces from all layers (except pwr/gnd) from fiducial area. It has come to my attention that this is only necessary on the side where fud is placed. Which is the correct method of design using a fidicial?
Electronics Forum | Wed Oct 20 11:15:23 EDT 2010 | jax
Circuit and Local Fiducials are all the same. The difference is the amount of "Stretch and Skew" that is accounted for. Local fiducials apply "Stretch and Skew" to a single placement or area of the circuit, depending on Equipment used. Circuit fiduci
Electronics Forum | Mon Oct 25 05:52:34 EDT 2010 | sachu_70
In csae you use 2 fiducial recognition, ensure that board fiducials are oriented across a diagonal and spaced far apart. Also, maintain a prefered dia between 1-2 mm for the fiducial on board to have have a better correction factor recorded during fi
Electronics Forum | Wed Oct 20 08:40:48 EDT 2010 | xps
Hi everyone, here a question for the SMT production engineers... is possible today mount the fine pitch and ultrafine pitch devices (BGA, QFP, CSP), without using the local fiducials, but using the three standard fiducials of row card only? The corre
Electronics Forum | Thu Oct 28 00:01:55 EDT 2010 | emmanueldavid
XPS, Hope the information in the above thread may help to get You right. BTW, Local Fiducial Marks are meant for specific devices in the Circuit Cards & typically selected to overcome offset or precision placement issues faced from Global Fiducial
Electronics Forum | Thu Dec 09 14:10:42 EST 1999 | se
Fiducial recognition is based on finding the centroid of the gray scale density of the fiducial. Round fiducials are easier for the software to digest in most cases, but its more important what the camera sees. Gray scale or color contrast of the fi
Electronics Forum | Wed Jun 09 13:11:29 EDT 1999 | John Thorup
| In past PCB designs I have cleared all traces from all layers | (except pwr/gnd) from fiducial area. It has come to my attention that this is only necessary on the side where fud is placed. Which is the correct method of design using a fidicial?