Continuous transmission harassment nominal measurement frequency range for household appliance products: 148.5kHz-30MHz (the actual value is 150kHz-30MHz).
The main source of the continuous transmission harassment:
The switching frequency of the switching source, the harmonic (Harmonic Analyzer) harassment, the rectifier noise of the power rectifier circuit, the running noise of AC machine, the brush noise of DC machine, electromagnetic disturbance of the electromagnetic induction heating equipment, crystals and digital circuit electromagnetic disturbance of the intelligent control equipment.
When we find the harassment source of the overweight point by the harassment location way, we can take the corresponding EMI control measures.
Household appliances intermittent conduction harassment nominal measure frequency range:148.5kHz-30MHz (the actual value is 150kHz-30MHz).
Measurement on the power terminal, the central frequency of the measurement is: 150kHz, 500kHz, 1.4MHz, 30MHz.
Switching manipulation of the temperature control instruments, the program mode machines and other electrical control or operating instruments can generate the intermittent harassment.
This operation can be realized through relay and SPC electronic/mechanical switch.
Such harassment is usually formed of the transient shock by the relay, the switch contacts wobble and impure resistance load switching.
We can take the corresponding EMI control measures for the above two aspects.
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