Corsair HX1000 PSU Review

EMC Pre-Compliance Testing

EMC, EMI & EMS Acronyms

Electromagnetic Compatibility (EMC): The ability of a device to operate properly in its environment without disrupting the proper operation of other nearby devices.

Electromagnetic Interference (EMI): This represents the electromagnetic energy a device emits, which can cause problems in other nearby devices if it is too high.

Electromagnetic Immunity (EMS): The tolerance to electromagnetic emissions.

Equipment & Standards

To properly measure the EMI that a device emits, you need special equipment defined by the CISPR 16-1-1 specification. To learn more about our EMI testing equipment, please check out How We Test Power Supply Units.

The corresponding standards for minimizing EMI in IT products are CISPR 22 and its derivative EN 55022, which is for devices sold in the EU. There, every component featuring the "CE" marking has to comply with the EN 55022 standard. Both CISPR 22 and EN 55022 standards divide devices into two classes: A and B. B-class equipment is for domestic environments, so permitted EMI emissions are significantly lower than for A-class devices.

CISPR / EN55022 Limits
CISRP 22/ EN 55022 Class A Conducted EMI Limit
Frequency of Emission (MHz)Conducted Limit (dBuV)


0.15 - 0.5079


0.50 - 30.073


CISPR 22/ EN 55022 Class B Conducted EMI Limit
Frequency of Emission (MHz)Conducted Limit (dBuV)


0.15 - 0.5066 - 56

56 - 46

0.50 - 5.0056


5.00 - 30.0060


Conducted EMI Results

To conduct our EMC pre-compliance testing, we use the EMCView software kindly provided by TekBox Digital Solutions.

The conducted EMI emissions are low, and much lower than the corresponding CISPR / EN55022 limits.

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