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Intel ATX Power Supply Design Guide
Version 0.9
6. Electromagnetic Compatibility
6.1 EMI
The power supply shall comply with CISPR 22, 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; and 100% load on each output. Tests will be performed at 100 VAC 50 Hz, 120 VAC 60 Hz, and 220 VAC 50 Hz power.
6.2 Input Line Current Harmonic Content (Optional)
If applicable to sales in Japan or Europe, the power supply shall meet the requirements of
6.3 Magnetic Leakage Fields
A PFC choke magnetic leakage field shall not cause any interference with a
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