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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 are
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: The first 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.
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.
Содержание XVR
Страница 1: ...Standalone XVR User s Manual V1 0 0...
Страница 84: ...75 Figure 3 73 Figure 3 74...
Страница 93: ...84 restore original status Figure 3 85 Figure 3 86 3 11 1 3 1 Upgrade Important...
Страница 117: ...108 Figure 3 109 Figure 3 110...
Страница 118: ...109 Figure 3 111 Figure 3 112...
Страница 132: ...123 Figure 3 129 Click draw button to draw the zone See Figure 3 130 Figure 3 130 Name Input customized rule name...
Страница 139: ...130 Figure 3 136 Figure 3 137...
Страница 140: ...131 Figure 3 138 Figure 3 139...
Страница 143: ...134 Figure 3 142 Figure 3 143...
Страница 144: ...135 Figure 3 144 Figure 3 145...
Страница 152: ...143 Figure 3 157 Figure 3 158...
Страница 170: ...161 Figure 3 180 For digital channel the interface is shown as below See Figure 3 181 Figure 3 181 3 11 5 6 ATM POS...
Страница 184: ...175 Figure 3 198...
Страница 222: ...213 Figure 4 58 Figure 4 59...
Страница 236: ...227 Figure 4 75 Figure 4 76...
Страница 241: ...232 Figure 4 83 Figure 4 84 Please refer to the following sheet for detailed information...
Страница 244: ...235 Figure 4 86 Figure 4 87 Figure 4 88 Please refer to the following sheet for detailed information...
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