What does faraday cage do?

Faraday cage is a cage made of metal or good conductor. Named after michael faraday, the founder of electromagnetism and a British physicist, it is a kind of equipment used to demonstrate the principles of equipotential, electrostatic shielding and high voltage live working. It consists of a cage, a high-voltage power supply, a voltage display and a control part. Its cage is connected to the earth, and the high voltage power supply delivers 654.38+ 1 100 million volts of DC high voltage to the discharge rod through the current limiting resistor. When the tip of the discharge rod is 654.38+00 cm away from the cage, discharge sparks appear. According to the condition of electrostatic balance of grounding conductor, the cage is an equipotential with zero internal potential and zero electric field, and the charge is distributed near the outer surface of the discharge rod.

Simply put,

Electromagnetic shielding room,

Students are required to sit inside to prevent them from cheating in the exam.

Foreign washing machine air conditioners are all placed inside to measure electromagnetic radiation, not to mention information products.

Some radars, communication stations and some encrypted transmission measurements are tested internally.

Some deep space exploration equipment should also be tested in it, which can attenuate the transmitted signal very weakly and the field strength is very accurate.

High anti-jamming communication equipment must be debugged in this electromagnetic "vacuum" environment in order to work in the battlefield of electronic countermeasures.