Smart Gui - Algorithm Training Material_rev1.pdf - 第95页

Copyright © ViT rox All Rights Reserved . S-type Algorithm - Location Mode 95 1. Location Mode ● Use to set the location method for SOIC Algorithm. ● There are 4 different location modes a. V ector ➔ Uses the geometry of…

S-type Algorithm

It is not possible to omit one lead from one side for a 4 sided

device using No Mid Lead Mode. If there is a need to omit pins

in other patterns, then Error Masks must be used to mask joint

and bridge errors – Please refer to Action on Failure training

module.

S-type Algorithm - Location Mode

1. Location Mode

● Use to set the location method for SOIC Algorithm.

● There are 4 different location modes

a. Vector

➔ Uses the geometry of the component to create a template to search in the x and

y direction for the component.

➔ Bright pads, or vias close to the component may prevent it from locating correctly.

b. Correlation

➔ Correlation mode attempts to match the observed pattern of bright leads and dark

spaces between leads to a theoretical model of an ideal case

➔ Used selected image plane & image plane used for location that best correlates to

the theoretical location is taken as the location of the part.

c. Flexible lead

➔ Takes the best features of vector & correlation.

➔ It searches out from the center of the component,

➔ However it does have the ability to compensate for leads which are not exactly

equal in length.

➔ This should be used by default

d. Parallax Flexible lead

➔ The row of shoulders and the row of toes are located independently of one

another. This happens due to parallax and is worst with tall leads at the side of the

field of view

➔ This gives better results where toes and shoulders do not align

S-type Algorithm - Location Mode (Vector)

1. Lateral Location

● For Post Reflow, Tick this.

● For Pre Reflow, untick this.

● This can assist during joint inspection in location of the joints which having

nice toe fillets.

● There are occurrences when it does not correctly locate. (Bright Pad &

Wide pads)

2. Refine Location

● Tick this to help to locate the fillet.

● Recommend to on this.