ELECTROMAGNETIC MEASUREMENT

We are a high-tech joint-stock enterprise specializing in the research, development, and production of electromagnetic measuring instruments. Here is a brief introduction to electromagnetic measurement.

　　Research the technical science of electrical quantities, magnetic quantities and various non-electrical quantities that can be converted into electrical quantities. Measurement refers to the process of comparing the measurand (unknown quantity) with a known standard quantity by experimental methods to achieve quantitative understanding. The laws of natural phenomena can only be deeply understood when it is possible to describe them quantitatively, and they can only be widely recognized after they are continuously confirmed by experiments and practice. At the same time, people use various phenomena that have mastered their laws to develop new measurement methods and tools, creating conditions for the further development of science and revealing new laws.

　　Among the numerous phenomena and laws in nature, electromagnetic laws have extensive connections with other physical phenomena, such as electrical or magnetic mechanical effects, thermal effects, light effects, chemical effects, etc. This provides a variety of methods and means not only for the measurement of electrical and magnetic quantities, but also for almost all non-electrical measurements. In fact, as long as a suitable detection device is provided, various measurement information obtained in different ways can be easily processed electrically. At the same time, because electrical signals are easier to convert, amplify, and transmit than other types of signals, the most effective tool for data processing in the 1980s, the electronic computer, also requires the input of electrical signals. Therefore, electromagnetic measurement has a very important role in the field of technology and science. status.

　　Measurement is the process of comparing an unknown quantity to a standard quantity. In electromagnetic measurement, the standard quantity provided by the standard device does not necessarily have the same property as the unknown quantity. Even if they have the same property, their magnitudes may be quite different. To this end, the unknown quantity and the standard quantity need to be transformed into comparable quantities in the same nature and quantity before comparison. For example, a mechanical indicating electric meter usually first converts the standard quantity into torque and stores it in the tension wire or hairspring of the electric meter, while the unknown quantity is also converted into a torque of the same order of magnitude by using electromagnetic or electrostatic mechanical force effects for comparison. Displayed as an offset of the pointer or blip. Another example is a comparison instrument, which mostly converts unknown quantities and standard quantities into voltages (or currents) in the measurement circuit for comparison. When the two voltages are equal, the detection instrument points to zero. For a mechanical indicating meter, the measurement result can be read directly according to the position of the pointer or the light spot on the dial. The comparison instruments, such as bridges, also need to calculate the measurement results through data processing. This step can be done automatically if automated measurements are used.

　　Every link that makes up the measurement process, whether hard equipment (various meters, instruments, electrical benchmarks, etc.) or soft measures (such as different electromagnetic measurement methods, data processing, etc.), is not absolutely ideal and perfect, and will exist. due to electromagnetic measurement errors. In addition, various disturbances and undesired interactions between the outside and inside of the measurement system will also introduce various measurement errors. In order to reduce and eliminate these error sources, it is necessary to set up electromagnetic shielding in the meter and instrument or take measures to prevent interference in the measurement line.