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 EL Model Board Comparison
Model Board
ComparisonTM
(MBC) can identify defects on PCBAs (or individual electronic components) by
comparing their thermal behavior to a model. Models are created by
testing one or more known good boards (golden boards).
MBC can detect
very small temperature differences between functional and defective boards
that are nearly impossible to detect using any other temperature measurement
method. During an MBC test, a sequence of thermal images is captured
while the board is energized. Boards are energized by powering them or
by running a functional or diagnostic test. The I/O module provides
relay outputs to control power to the
board.
MBC can inspect
an entire board at one time, regardless of components density, and without
contacting the board. Thousands of detector elements in the InfraSight EL camera
act as virtual test probes.
Example
Step 1 -
Create Model
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Create a golden
board model by testing known good boards. The images below show
the temperature changes that occurred on the board during the
test. |
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Step 2 - Analyze
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Test a defective board so that its thermal profile can be compared
to the model. Areas on the board that are different from the
model are highlighted and may indicate defects. |
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Step 3 - Locate Defect
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Locate the
defect by overlaying a transparent visual picture of the board.
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Model Board Comparison
Settings
Models are
created by adding tests of known good boards to a group. Acceptance
Criteria determines how the board is compared to the model. Board
tests can be automatically saved to hard disk after each test.
Set the test
length and the rate at which images are evaluated during a Model Board
Comparison test.
Set the time
that each relay will be activated during the test. Only one relay is
needed when powering a board. Multiple relays can be used to perform
more sophisticated tests such as powering different board planes or applying
different loads at different times.
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