Electromagnetic shielding rooms are all grounded. Why do electromagnetic shielding rooms need to be grounded? This is of course inseparable from its requirements. What is required for electromagnetic shielding rooms to be grounded? Let the manufacturer’s technicians tell you about it. .
1. Floating ground A. The equipment ground wire is electrically insulated from the reference ground and other conductors, that is, the equipment floating ground; B. In order to prevent the disturbance current on the chassis from directly coupling to the signal circuit, the signal ground is intentionally insulated from the chassis, that is, the unit circuit Suspended ground.
2. Single-point grounding Single-point grounding provides a common reference point for many circuits connected together. Parallel single-point grounding is the simplest. It does not have the problems of common impedance coupling and low-frequency ground loops, so there is no disturbance.
3. Multi-point grounding Multi-point grounding can avoid the problem of single-point grounding at high frequencies. Multi-point grounding must be used in digital circuits and high-frequency large-signal circuits. The module and the circuit are connected through many short wires (<0.1λ) to reduce the common mode voltage generated by the ground impedance.
4. Mixed grounding. Mixed grounding includes the characteristics of single-point grounding and multi-point grounding. For example, the power supply in the system needs to be grounded at a single point, while the radio frequency part needs to be grounded at multiple points. Mixed grounding uses reactive devices to make the grounding system show different characteristics at low frequency and high frequency, which is necessary in broadband sensitive circuits.
The grounding of the electromagnetic shielding machine room plays such a role, so when the electromagnetic shielding machine room is built, it will be grounded. This is why the electromagnetic shielding room needs to be grounded.