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Intel ATX Power Supply Design Guide
Version 0.9
Page 28
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
EN61000-3-2 Class D and the Guidelines for the Suppression of Harmonics in Appliances
and General Use Equipment Class D for harmonic line current content at full rated power.
6.3 Magnetic Leakage Fields
A PFC choke magnetic leakage field shall not cause any interference with a high-resolution
computer monitor placed next to or on top of the end use chassis. Final acceptable leakage
field strength will be determined by the end system vendor during system level testing in
the end use chassis.