The objects measured by electricians mainly refer to current, voltage, electric power, electric energy, phase, frequency, power factor, resistance and so on. Instruments that measure various amounts of electricity (including magnetic quantities) are collectively referred to as electrical measuring instruments. There are many types of electrical measuring instruments, the most common of which is the meter that measures the basic power. Next, I will slowly introduce the basic knowledge and measurement methods of commonly used electrical instruments.
The so-called electrician measurement is to compare the measured electric quantity or magnetic quantity with the similar quantity. Depending on the method of comparison, the measurement method is different, so different measurement errors are taken. Therefore, in addition to the correct selection of instruments and instruments in the measurement, it is necessary to use appropriate measurement methods to master the measurement techniques to minimize the measurement error. To this end, before introducing various electrical instruments and measurements separately, we first introduce the symbols, models, construction principles of the instruments, the concept of error mechanics, and the technical indicators of electrical instruments.
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