Intel ATX 3.0, Руководство по конструкции, Страница: 62 / 89

Electromagnetic
Compatibility
62 336521
8 Electromagnetic Compatibility
The following subsections outline applicable product regulatory requirements for the
power supplies. Additional requirements may apply dependent upon the design,
product end use, target geography, and other variables.
8.1 Emissions – REQUIRED
The power supply shall comply with FCC Part 15, EN55023 and CISPR 22, 5th ed.,
meeting Class B for both conducted and radiated emissions with a 4 dB margin. Tests
shall be conducted using a shielded DC output cable to a shielded load. The load shall
be adjusted as follows for three tests: No load on each output; 50% load on each
output; 100% load on each output. Tests will be performed at 100 VAC 50Hz, 120
VAC 60 Hz, and 230 VAC 50 Hz power. Additionally, for FCC certification purposes, the
power supply shall be tested using the methods in 47 CFR 15.32(b) and authorized
under the Declaration of Conformity process as defined in 47 CFR 2.906 using the
process in 47 CFR 2.1071 through 47 CFR 2.1077.
8.2 Immunity - REQUIRED
The power supply shall comply with EN 55024 and CISPR 24 prior to sale in the EU
(European Union), Korea, and possibly other geographies.
8.3 Input Line Current Harmonic Content - OPTIONAL
Class D harmonic limits will be determined at the time of measurement based on the
actual power draw from the mains.
Table 8-1 is a partial list of countries and their current EMC requirements. Additional
requirements may apply dependent upon the design, product end use, target
geography, and other variables.
Table 8-1: EMC Requirement by Country
Country Requirements Document
EU (European Union) EN61000-3-2
Japan JEIDA MITI
China CCC and GB 17625.1
Russia GOST R 51317.3.2
8.4 Magnetic Leakage Field - REQUIRED
A PFC choke magnetic leakage field must not cause any interference with a high-
resolution computer monitor placed next to or on top of the end-use chassis.