Panasonic CJ-HDR216 User Manual

Also see for CJ-HDR216: Quick start guide

201conductance of the ground conductor. In the high-frequency circuit, you need to use themultiple-point ground mode and each cable needs to connect to the ground. The lengthshall be less than the 1/20 of the signal wavelength.Mixed ground: The mix ground consists of the feature of the one-point ground andmultiple-point ground. For example, the power in the system needs to use the one-pointground 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 isopen circuit and the circuit is one-point ground. For the radio frequency signal, thecapacitance is conducive and the circuit adopts multiple-point ground.When connecting devices of huge size (the device physical dimension and connectioncable is big comparing with the wave path of existed interference), then there arepossibility of interference when the current goes through the chassis and cable. In thissituation, 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 thesystem compatibility, and the other is the external interference coupling into the earthcircuit, which results in system error. For the external interference is not regular, it is noteasy to resolve.3. Thunder proof ground method in the monitor system The monitor system shall have sound thunder proof earthing to guarantee personnelsafety and device safety. The monitor system working ground resistance shall be less than 1Ω.

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