Hi Nic
Section 15.33b1 has the phrases "frequency signal generated or used in the
device". So it seems to me that highest frequency investigated will depend on
whether your device uses the pc clock directly or if it only uses its own
clock.
best regards
Tom
T.N. Cokenias Consulting
P.O. Box 1086
El Granada CA 94018
On Sep 29, 2011, at 7:42 AM, Nic Johnson wrote:
When testing a USB PC peripheral to FCC part 15, does anyone know if
you
need to go up to the 5th harmonic of the highest frequency of the PC or just
the highest frequency used in the peripheral? I can’t find any rules that
say this specifically.
Nic Johnson
Test Engineer
NCEE Labs
Product Compliance Solutions
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