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1.4.1 Classification of commonly used electrical instruments

Electrical instruments can be divided into two categories according to different measurement methods: direct reading instruments and comparative instruments. The direct -reading instrument can directly indicate the size of the measured, and the comparison instrument needs to be measured with the same standard volume to obtain its size. Commonly used electrical instruments are mainly direct -reading instruments.

Basic knowledge

Direct -reading electrical instruments can be classified according to the principle of working principles, measurement objects, the type of instrument working current, the method of use of the instrument, and the accuracy level of the instrument.

Classified by the working principle of the instrument, it can be divided into magnetic appliances, electromagnetic, electric systems, electrostatic systems and rectification instruments.

Classified by measuring objects, it can be divided into current tables (ampere tables), voltage table (volt table), power table (Watt table), electric meter (kilowatt time), Ohm table, Zhao table, universal meter and other types.

Classification according to the type of operating current of the instrument, it can be divided into DC meter, AC meter, and cross -current instruments.

Classified by the instrumentation method, it can be divided into installation instruments and portable meters.

According to the accuracy level of the instrument, it can be divided into 7 levels of level 0.1, 0.2, level 0.5, level 1.0, level 1.5, level 2.5, and level 4.

Digital instrument is also a direct -reading instrument, which directly displays the meter instrument in the form of a digital form.

1. The model of the electrical instrument

The electric instrument is the same as other instruments, and the model represents its purpose, role and working principle. The models of various products are prepared in accordance with relevant regulations.

In the shape of the first place, the maximum size of the instrument panel shaped; the second position of the shape is compiled according to the size of the instrument shell; the series code is compiled according to the principle of the instrument working principle, such as the magnetic electrical instrument code C (the first letter of the Chinese character pinyin), the first letter of the Chinese character), the first letter of the Chinese character), the first letter of the Chinese character), and the first letter of the Chinese character), and the first letter of the Chinese character), the first letter of the Chinese character pinyin), and the first letter of the Chinese character), the first letter of the Chinese character), the first letter of the Chinese character), and the first letter of the Chinese character), and the first letter of the Chinese character. The electromagnetic instrument code is T, the electrical instrument code is D, the induction system instrument code is G, and the rectifier instrument code is L. Such as the 10T1 – A -type instrument: the shape code is "10"; "T" means the electromagnetic instrument; "1" is the design serial number; "A" represents the current table.

The model of the portable electrical instrument does not indicate the shape code part of the installation size, and the composition of the rest is the same as the installation instrument. Such as T62-V instrument: "T" indicates the electromagnetic instrument; "62" means the design serial number; "V" represents the voltage meter.

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