For most devices, shielding is necessary. Especially with the increasing frequency of circuit operation, relying solely on circuit board design often cannot meet the requirements of electromagnetic compatibility standards. The shielding design of the chassis has many differences from traditional structural design. Generally, if the electromagnetic shielding requirements are not considered in the structural design, it is difficult to add shielding effects to the chassis. So, for modern electronic product design, shielding must be considered from the beginning
Inspection Items
The inspection items for electromagnetic emission (EMI) include:
① Conducted (CE) (150kHz~30MHz) ② Intermittent interference voltage (clicking sound) (150kHz, 500kHz, 1.4 MHz, and 30MHz) ③ Interference power (30MHz~300MHz)
④. Harmonic current (2-40 harmonics)
Flicker
The inspection items for electromagnetic immunity (EMS) include:
① Electrostatic discharge immunity ② Radiated electromagnetic field (80MHz~1000 MHz) immunity ③ Electrical fast transient/burst immunity ④ Surge (lightning) immunity ⑤ Injection current (150kHz~230MHz) immunity ⑥ Voltage dips and short-term interruptions immunity
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1. Telephone communication and confirmation of requirements
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