During The Design Phase; Checking The Prototype; Before The Emc Test; Should Things Go Wrong - 3M ScanEM-QC CTK019 User Manual

During the Design Phase

This is the time to ensure agency compliance for your product at the lowest
cost and with minimum impact on your schedule. The 3M
Electromagnetic Near-Field Probe can help you:
‰ Check your first fully or even partially working PCB assembly for "hot"
EMI areas. Look at the schematic and the PC layout to see if anything
can be done: shorten the traces, buffer some lines with resistors, for
example.
‰ If nothing can be done to a PCB area in the way of prevention, an
EMI map of the board should help mechanical engineering design the
enclosure so that it provides EM shielding right where it is needed. This
can save your company thousands of dollars in a corrective redesign
later.

Checking the Prototype

Scan the entire surface of your first finished prototype. If your product has
a metal enclosure, pay special attention to openings, areas around buttons,
LEDs, LCDs, connectors or vents. If the enclosure is made of plastic, it is
essentially transparent to electromagnetic emissions. Connect all cables that
are normally connected to the device and attach all the specified peripherals
(in printers, monitors). Scan the full length of each cable.

Before the EMC Test

Perform the complete scan as described above. Make sure that you identify
the hot spots. Prepare remedies to take with you to the FCC lab in case your
product has trouble passing.

Should Things Go Wrong

Knowledge of where the EMI hot spots are is your most powerful tool in
countering excessive emission levels.
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