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Grounding allows all unit circuits in the entire circuit system

20-09-2019

Grounding allows all unit circuits in the entire circuit system to have a common reference zero potential; that is, there is no potential difference between the grounds of each circuit; ensuring that the circuit system can operate stably.

Prevent external electromagnetic field interference; the chassis ground provides a bleed passage for transient interference; it can also discharge a large amount of charge accumulated on the casing due to static induction through the earth; otherwise, the high voltage formed by these charges may cause internal equipment Spark discharge; causing interference; in addition; for the shield of the circuit; if a suitable grounding is selected, a good shielding effect can also be obtained.

Ensure safe operation; when electromagnetic induction of direct lightning occurs; avoid damage to electronic equipment; when the input voltage of power frequency AC power is directly connected to the casing due to poor insulation or other reasons; avoid operator's electric shock; The medical device is directly connected to the patient's human body; when the case has a voltage of 110V or 220V, a fatal danger will occur.

Grounding is the main method to suppress noise and prevent interference; grounding can be understood as an equipotential point or equipotential surface; it is the reference potential of a circuit or system; but not necessarily earth potential; to prevent damage and protect workers from lightning Personal safety; the casing of the electronic equipment and the metal components of the equipment room; must be connected to the earth; and the grounding resistance is generally small; it cannot exceed the specified value.