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ATX12V Power Supply Design Guide
Version 2.0 Final Review Copy
39
6. Electromagnetic Compatibility
The following subsections outline sample product regulations requirements for a typical
power supply. Actual requirements will depend on the design, product end use, target
geography, and other variables. Consult your company’s Product Safety and Regulations
department for more details.
6.1. Emissions
The power supply shall comply with FCC Part 15, EN55022: 1998 and CISPR 22: 1997,
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.
6.2. Immunity
The power supply shall comply with EN 55024:1998.