Analog signal isolator is an indispensable instrument, its role is to better solve these interference problems. First of all, the three elements of interference are sensitive source, interference source and coupling path, the lack of one of these three elements, electromagnetic compatibility problems will not exist. So start with these three elements. Find a convenient solution, usually the interference source and the sensitive source can not be solved, generally from the coupling path to find a way, is also commonly used. Such as filtering, shielding and other means.

All field equipment is not grounded, so that all process loops have only one ground point, can not form a loop, this method seems simple, but in practical applications are often difficult to achieve, because some equipment requires a certain ground to ensure measurement accuracy or ensure personal safety, some equipment may be due to long-term corrosion and wear or climate impact and form a new ground point. Signal isolator

The electric potential of the two ground points is the same, but because the resistance of the ground point is affected by many factors such as geological conditions and climate change, this scheme can not be completely achieved in practice. Signal isolator