VI User Manual - 第312页

Production 11 - 12 Vision 2007 4.10 User Manual Re v 01 11.3.1.3 Variable selection to anal yze with the SPC engi ne Editing the .tst file, the users can specif y which componen t, paste or feeder they want to study. Sel…

Production

Vision 2007 4.10 User Manual Rev 01 11 - 11

11.3 Embedded SPC

In order to prevent problems during production, Vision 2007 software can analyze the inspection re-

sults using an optional embedded SPC engine.

SPC is Statistical Process Control.

This SPC engine can generate, during the production, several types of warnings which will help the

operator to prevent the problems.

The analysis proposed is a short term analysis. Typically, for each followed variable, it works with 30

points which are themselves the average of 5 consecutive measures (the values 30 and 5 can be

configured). So it works with the measures concerning the last 150 inspections.

11.3.1 Installation and activation

A dongle is required for use of the SPC engine. Below, we assume that E is the CDROM

drive letter.

11.3.1.1 Installation of the SPC component and dongle

On the AOI system:

1. Log on Windows NT with the administrator rights.

2. Put the SPC dongle on the parallel port.

3. Put the Vision 2007 software installation disk into the CDROM drive.

4. Go to the directory E:\SPC.

5. Execute the tool SetupSPC.exe.

6. Restart the computer.

11.3.1.2 Activation of the embedded SPC in Vision 2007

You will have unlock the SPC Embedded VIT option key.

The presence of the DLL AVSPCControl.dll in the same directory as

Vision2007.exe is sufficient to activate the embedded SPC. This DLL is automati-

cally installed with Vision System setup.

To uninstall it, execute the tool SetupSPC.exe or go to the add/remove

program and select SPC for Vision 2007.

Production

11 - 12 Vision 2007 4.10 User Manual Rev 01

11.3.1.3 Variable selection to analyze with the SPC engine

Editing the .tst file, the users can specify which component, paste or feeder they

want to study.

Selection of the components to analyze with the SPC engine.

 If the user chooses a component, the SPC engine will study the evolution of its

position deviation (3 variables: X, Y, Theta).

 If the user chooses a paste pad, the SPC engine will study the evolution of its

surface.

 You can study the serigraphic mask evolution by selecting the X, Y and/or theta

evolution (screenshot TSTeditPaste.bmp). It calculate the general deviation off

all past pad.

 If the user chooses a feeder, the SPC engine will study the evolution of the posi-

tion deviation for all the components associated to this feeder (3 variables: aver-

age X, Y, Theta of the corresponding components).

Components and paste pads are identified by their topology followed by

their board number.

The SPC engine studies each variable with the following tests (also called SPC functions).

Each of them can generate a warning.

 1 point outside 3 sigma

 2 out of 3 points outside 2 sigma

 4 out of 5 points outside 1 sigma

 8 points on the same side of the average

 Trend of 7 points

 15 consecutive points in the 1 sigma zone

 Too few or too many runs

 8 consecutive points with none in the 1 sigma zone – either side

 Runs crossing the average line.

Embedded SPC

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11.3.2 SPC option in production screen

A SPC toobar.

B SPC charts display area.

11.3.2.1 SPC toolbar

Function of each button:

Activate/deactivate the analysis. The user can come back to the classical

Production screen.

Reset the analysis.

Display the list of the warn-

ings found. The red button

SPC WARNING allows to clear it.

The charts correspond to the se-

lected warning.

Display the curves or the group of dots.

Select the graphs type to display.

Embedded SPC