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The next step “Device Training” makes use of the scanned PCB image and the XY CAD overlay to teach

device test parameters. The FA system will begin selecting and presenting devices to be trained, from the

information contained in the CXF data file. The operator then defines each “unique” device type by interactively

stepping through the components, drawing Region Of Interest (ROI) around key device features and checking

basic visual test parameters (i.e., color, polarity, markings, etc.). Common devices are taught once and all

matching devices are automatically verified. The system will stop if inconsistencies are found.

Best Practice: By checking the <Auto-Train Enable> check box the system will automatically verify the all

devices of the same type by using the operator selected inspection parameters defined for the first device of

this type (stored in the library). If left unchecked, the system will prompt the operator to step-thru every device

on the assembly. Auto-Train enabled is the preferred operating mode as it saves time and effort by automating

verifying that all XY designated devices are present and correctly placed on the board. This part of the process

is also known as, “First Article Inspection” and should be performed with <Auto-Train Enabled > to speed up

the inspection process.

NOTE: You may choose to interrupt the training process at any time and resume later, provided that you save

your work before exiting. See: Stop Device Training and Resume Device Training for additional information on

these topics.

1. After the first three devices are defined the very next component (#4) begins the process of training

devices.

2. Once the 4

component is presented, this is where the operator defines basic visual test parameters

(i.e., color, polarity, markings, etc.).

Best Practice: By drawing an ROI around laser labeling, this will verify: correct component, value

and orientation – as applicable. By drawing an ROI around the center of a small (non-labeled) chip

device; this will inspect for: device presence, absence, lot (color) and placement.

Device Training Dialog Box ROI Placement Example

3. When verifying device placement, the Region of Interest (ROI) or “search zone” position can be moved

using the <mouse> or keyboard <Arrow Keys>. Each control serves different functions of movement

explained below:

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AOpen AOI-702U Especificaciones Pagina 73