Do you know what the EMC Six-Step Approach to Rectification is?
Step 1: The methods of finding and confirming the radiation source include the elimination method, the frequency search method of the spectrum analyzer, and the natural frequency analysis method of the component. The exclusion method includes the wire pulling method, the partition work exclusion method, the human touch method with low voltage and low current, and the area shielding elimination method. The natural frequency analysis method of components refers to the analysis and classification of the fixed frequency and its doubling frequency of some components, such as crystal oscillator and DDR and other components The operating frequency is fixed.
Step 2: Filtering is generally divided into capacitive filtering, RC filtering and LC filtering.
Step 3: The methods of absorbing electromagnetic waves include circuit series magnetic bead method, magnetic ring winding method and absorbing material method. Special attention should be paid to the use of the absorption method: the frequency of the electromagnetic wave that exceeds the standard must be within the frequency range of the electromagnetic wave absorbed by the absorbing material used, otherwise the absorption method will fail.
Step 4: The grounding method is generally divided into single-point grounding method and multi-point grounding method.
Step 5: The shielding method generally includes the shielding cover shielding method, the shell shielding method and the PCB wiring layout shielding method.
Step 6: Energy dispersion method means that the control software of some measured objects can use technologies such as spread spectrum and frequency hopping to broaden the frequency bandwidth and jump frequency of the energy concentration to disperse the energy of the frequency band, so that the energy attached to the single point frequency is reduced, that is, the electromagnetic wave intensity of the single point frequency radiation is reduced. Therefore, this method will have a significant effect on the frequency radiation exceeding the standard of the spike burr-shaped waveform, but will not play a significant role in the frequency radiation exceeding the standard of the envelope waveform.
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