Goto Section: 15.31 | 15.33 | Table of Contents
FCC 15.32
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 15.32 Test procedures for CPU boards and computer power supplies.
Power supplies and CPU boards used with personal computers and for which
separate authorizations are required to be obtained shall be tested as
follows:
(a) CPU boards shall be tested as follows:
(1) Testing for radiated emissions shall be performed with the CPU board
installed in a typical enclosure but with the enclosure's cover removed so
that the internal circuitry is exposed at the top and on at least two sides.
Additional components, including a power supply, peripheral devices, and
subassemblies, shall be added, as needed, to result in a complete personal
computer system. If the oscillator and the microprocessor circuits are
contained on separate circuit boards, both boards, typical of the
combination that would normally be employed, must be used in the test.
Testing shall be in accordance with the procedures specified in § 15.31.
(i) Under these test conditions, the system under test shall not exceed the
radiated emission limits specified in § 15.109 by more than 6 dB. Emissions
greater than 6 dB that can be identified and documented to originate from a
component(s) other than the CPU board being tested, may be dismissed.
(ii) Unless the test in paragraph (a)(1)(i) of this section demonstrates
compliance with the limits in § 15.109, a second test shall be performed
using the same configuration described above but with the cover installed on
the enclosure. Testing shall be in accordance with the procedures specified
in § 15.31. Under these test conditions, the system under test shall not
exceed the radiated emission limits specified in § 15.109.
(2) In lieu of the procedure in (a)(1) of this section, CPU boards may be
tested to demonstrate compliance with the limits in § 15.109 using a
specified enclosure with the cover installed. Testing for radiated emissions
shall be performed with the CPU board installed in a typical system
configuration. Additional components, including a power supply, peripheral
devices, and subassemblies, shall be added, as needed, to result in a
complete personal computer system. If the oscillator and the microprocessor
circuits are contained on separate circuit boards, both boards, typical of
the combination that would normally be employed, must be used in the test.
Testing shall be in accordance with the procedures specified in § 15.31.
Under this procedure, CPU boards that comply with the limits in § 15.109 must
be marketed together with the specific enclosure used for the test.
(3) The test demonstrating compliance with the AC power line conducted
limits specified in § 15.107 shall be performed in accordance with the
procedures specified in § 15.31 using an enclosure, peripherals, power supply
and subassemblies that are typical of the type with which the CPU board
under test would normally be employed.
(b) The power supply shall be tested installed in an enclosure that is
typical of the type within which it would normally be installed. Additional
components, including peripheral devices, a CPU board, and subassemblies,
shall be added, as needed, to result in a complete personal computer system.
Testing shall be in accordance with the procedures specified in § 15.31 and
must demonstrate compliance with all of the standards contained in this
part.
[ 61 FR 31048 , June 19, 1996, as amended at 62 FR 41881 , Aug. 4, 1997]
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Goto Section: 15.31 | 15.33
Goto Year: 2014 |
2016
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