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Electromagnetic compatibility testing is best considered

  • A.only if the product is to be sold outside its own country of manufacture
  • B.as a formality that rarely affects the design
  • C.from the beginning, since layout and screening decisions are hard to change later
  • D.only after the firmware is complete

Answer: C

Track layout, ground planes, filtering and enclosure design all bear on it and all become expensive to alter once the board is committed. A failure discovered at the test house weeks before launch is one of the classic embedded disasters.

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