In daily ordinary application monitoring system, often encounter some noise nuisance, didn't make the monitoring system can perhaps well stop, which affect things, expound the way to eliminate noise nuisance, above is monitoring system can smoothly.

Grounding things except for the front-end and back-end equipment and equipment to cut off the noise outside, also can perhaps line adopt steel pipe for the transmission line and ready to receive and pipe bit grounding and welding equipment disposition. But the noise and the disturbance of the ground is not to the disposal of the rules, but must be gradual stop to achieve the elimination of the consequences. As usual, the grounding of the circuit is not potential, the ground is stable, but it is actually the potential of the city, so it is necessary to pay attention to the ground size and the resistance value.

There are many methods of grounding, single point is only one of them. And application of low frequency circuit grounding wires to each unit circuit to connect to a point on the casing will not have a large loop, no large loop current loop is no big, no large loop current input and input their silence. There are many ways of grounding, and the detailed application of that method depends on the layout and efficacy of the system. The ground is the public loop. This is the first grounding. Now, in order to deal with this achievement, many of the success of the existence of the noise and disturbance of the grounding method, the method contains the following.

Single point grounding: single point grounding is a means of providing a common potential reference point for many of the circuits that are together, such as a flag signal that can be transmitted between circuits that are divided. Single point grounding requests that each circuit is grounded only once and is connected to the same point. Because there is only one point of reference, it is possible that trust does not exist in the ground loop, so there is no nuisance result;

Multi-point grounding: the circuit in the monitoring equipment is the ground reference point of the chassis, and the chassis of each equipment is the reference point. This kind of grounding arrangement may provide a low grounding impedance, which is due to the fact that each ground line may be very short when it is grounded. And multiple wire parallel may be low earth conductor's total inductance;

Hybrid grounding: hybrid grounding includes both single point earthing characteristics and multi-point earthing characteristics. , for example, the power of the system need to single point grounding, and radio frequency standard lights request multipoint earthing, dealing with dc, capacitance is open circuit, circuit is the single point grounding, dealing with radio frequency (rf), capacitance is conduction, circuit is the multipoint earthing.

When many equipment to connect each other bulky (physical size and connecting cables to the equipment and any nuisance of the existence of a standard light wavelength match a lot), there is a chassis and the influence of the cable through the process of the possibility of a nuisance. When this type of environment is produced, the disturbance current is usually present in the earth circuit of the system. It is necessary to pay attention to the following:

Safe ground: the application of ac equipment, it is necessary through the process of yellow-green safe ground wire grounding, or when the equipment in the power supply of the insulation resistance between the casing and variable hours, can cause electric shock damage;

Lightning protection grounding: the lightning protection system of the measures is a self-supporting system, which is composed of lightning rods, lower conductors and discussions connected with the grounding system;

Emc grounding: request for emc plan ground, including cut off grounding to avoid circuit for parasitic capacitance between nuisance, necessary to ground must stop cut off each other;

Filter grounding: filter in the same line usually contains a standard lamp or the power cord to the bypass capacitor, when the filter is not grounded, the capacitor is in suspended status, not bypass the influence.