IC Realtime HDVR-MX0402-1U5MP-AI2-WEB Product Manual - Page 247

Appendix 7.3 Thunder Proof Ground Method in the Monitor System

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cable connection can reduce the total conductance of the ground conductor. In the high-frequency circuit, you need to use the multiple-point ground mode and each cable needs to connect to the ground. The length shall be less than the 1/20 of the signal wavelength. ● Mixed ground: The mix ground consists of the feature of the one-point ground and multiple-point ground. For example, the power in the system needs to use the one-point ground mode while the radio frequency signal requires the multiple-point ground. So, you can use the following figure to earth. For the direct current (DC), the capacitance is open circuit and the circuit is one-point ground. For the radio frequency signal, the capacitance is conducive and the circuit adopts multiple-point ground. When connecting devices of huge size (the device physical dimension and connection cable is big comparing with the wave path of existed interference), then there is possibility of interference when the current goes through the chassis and cable. In this situation, the interference circuit path usually lies in the system ground circuit. When considering the earthing, you need to think about two aspects: One is the system compatibility, and the other is the external interference coupling into the earth circuit, which results in system error. For the external interference is not regular, it is not easy to resolve. Appendix 7.3 Thunder Proof Ground Method in the Monitor System ● The monitor system shall have sound thunder proof earthing to guarantee personnel safety and device safety. ● The monitor system working ground resistance shall be less than 1Ω. ● The thunder proof ground shall adopt the special ground cable from the monitor control room to the ground object. The ground cable adopts copper insulation cable or wire and its ground section 2 shall be more than 20mm . ● The ground cable of the monitor system cannot short circuit or mixed connected with the strong alternative current cable. ● For all the ground cables from the control room to the monitor system or ground cable of other monitor 2 devices, please use the copper resistance soft cable and its section shall be more than 4 mm . ● The monitor system usually can adopt the one-point ground.

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cable connection can reduce the total conductance of the ground conductor. In the high-frequency
circuit, you need to use the multiple-point ground mode and each cable needs to connect to the
ground. The length shall be less than the 1/20 of the signal wavelength.
●
Mixed ground:
The mix ground consists of the feature of the one-point ground and multiple-point
ground. For example, the power in the system needs to use the one-point ground mode while the
radio frequency signal requires the multiple-point ground. So, you can use the following figure to
earth. For the direct current (DC), the capacitance is open circuit and the circuit is one-point
ground. For the radio frequency signal, the capacitance is conducive and the circuit adopts
multiple-point ground.
When connecting devices of huge size (the device physical dimension and connection cable is big
comparing with the wave path of existed interference), then there is possibility of interference when
the current goes through the chassis and cable. In this situation, the interference circuit path usually
lies in the system ground circuit.
When considering the earthing, you need to think about two aspects: One is the system compatibility,
and the other is the external interference coupling into the earth circuit, which results in system error.
For the external interference is not regular, it is not easy to resolve.
Appendix 7.3 Thunder Proof Ground Method in the Monitor System
●
The monitor system shall have sound thunder proof earthing to guarantee personnel safety and
device safety.
●
The monitor system working ground resistance shall be less than 1Ω.
●
The thunder proof ground shall adopt the special ground cable from the monitor control room to
the ground object. The ground cable adopts copper insulation cable or wire and its ground section
shall be more than 20mm
2
.
●
The ground cable of the monitor system cannot short circuit or mixed connected with the strong
alternative current cable.
●
For all the ground cables from the control room to the monitor system or ground cable of other monitor
devices, please use the copper resistance soft cable and its section shall be more than 4 mm
2
.
●
The monitor system usually can adopt the one-point ground.