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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.
Summary of Contents for PENDVR-EL8M4K
Page 1: ...PENDVR EL8M4K ELITE SERIES...
Page 19: ...247 2 3 Connection Sample...
Page 127: ...363 restore original status Figure 4 115 Figure 4 116 4 9 1 3 1Upgrade Camera...
Page 150: ...386 Figure 4 137 Figure 4 138...
Page 165: ...401 Figure 4 153 Step 2 Draw the zone 1 Click Draw button to draw a zone See Figure 4 154...
Page 171: ...407 Figure 4 157 Figure 4 158...
Page 172: ...408 Figure 4 159 Figure 4 160...
Page 173: ...409 Figure 4 161 Figure 4 162...
Page 176: ...412 Figure 4 165 Figure 4 166...
Page 177: ...413 Figure 4 167 Figure 4 168...
Page 183: ...419 Figure 4 177 Figure 4 178 4 9 4 1 2 2 Trigger Snapshot...
Page 185: ...421 Figure 4 180 Figure 4 181 4 9 4 1 2 3 Priority...
Page 191: ...427 Figure 4 186 Figure 4 187...
Page 196: ...432 Figure 4 193 Figure 4 194...
Page 282: ...518 Figure 5 69 Figure 5 70...
Page 298: ...534 device Figure 5 86 Figure 5 87...
Page 304: ...540 Figure 5 94 Figure 5 95...
Page 305: ...541 Figure 5 96 Figure 5 97 Please refer to the following sheet for detailed information...
Page 332: ...568 Figure 5 136 Note For admin you can change the email information See Figure 5 137...
