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What is IEC 61000-6-4?

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What is IEC 61000-6-4?

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Editorial Team - EMC Directory

Jul 18, 2022

The IEC 61000-6-4 is an EMC standard by the International Electrotechnical Commission on generic emission limits of electronic or electrical equipment intended to use in industrial or light-industrial environments. This standard applies to equipment intended to be connected to a power network supplied from a high or medium voltage transformer dedicated to the supply of a manufacturing or similar plant and intended to operate in industrial locations. This standard also covers battery-operated equipment intended for industrial use.

This standard specifies the emission test requirements for devices with continuous, transient, conducted, and radiated disturbances. The emission limits ensure that disturbances generated by apparatus in a normal operation do not exceed a level that could prevent other apparatus from operating as intended. Fault conditions of apparatus are not taken into account.

The standard has three editions now with the most recent and valid edition published in 2018. Some of the technical changes done in the most recent edition are:

  • Possible future requirements on DC ports;
  • Possible future radiated polarity specific emission limits within a FAR;
  • The definition of average detector used for emission measurements at frequencies above 1 GHz and results using a peak detector are acceptable for all measurements;
  • The definition of different EUT test arrangements.

For radiated emission measurements, the following table shows the highest frequency up to which radiated emission measurements shall be performed based on the value of Fx.

Highest Internal Frequency (fx)
Highest Measured Frequency
Fx ≤ 108 MHz
1 GHz
108 MHz < Fx ≤ 500 MHz
2 GHz
500 MHz < Fx ≤ 1 GHz
5 GHz
Fx > 1 GHz
5 × Fx up to a maximum of 6 GHz

The standard also states that:

  1. For emission measurements above 1 GHz, the peak detector limits shall not be applied to disturbances produced by arcs or sparks that are high voltage breakdown events. Such disturbances arise when devices have mechanical switches that control current in inductors, or when devices contain or control subsystems that create static electricity. The average limits apply to disturbances from arcs or sparks, and both peak and average limits will apply to other disturbances from such devices.
  2. For radiated emission measurements using a free space open area test site (FSOATS), fully anechoic room (FAR), or semi-anechoic chamber (SAC), the measurement distance is the horizontal distance between the vertical projections of the calibration point of the receiving antenna and the boundary of the EUT. The boundary of the EUT is the smallest imaginary circular periphery around the most compact arrangement of the EUT, using typical spacing.
  3. The linear average detector defined in Clause 6 of CISPR 16-1-1:2015 shall be used where the use of an average detector is specified.

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