Classification of commonly used electrical instruments

*What is an electrical instrument?

In Electrical measurement, the various power, and the amount of the magnetic circuit parameters referred to as instrumentation electrical instruments.

* Simple classification of electrical instruments

There are many types of electrical instruments. According to the structure and purpose, they are mainly divided into four categories: indicating instruments, comparative instruments, digital instruments and smart meters.

Indicator

Features: It can convert the measured value into the mechanical deflection angle of the movable part of the instrument and directly indicate the measured size through the indicator. It is also called the direct reading instrument.

Classified by working principle: There are magnetoelectric meters, electromagnetic meters, electric meters and induction meters. In addition, there are rectifier instruments, ferromagnetic electric instrument and so on.

Typical instruments: instrument installation, portable instrumentation <br> <br> relatively meter

• Comparing the characteristics of the instrument: In the measurement process, the measured value is compared with the same standard quantity, and then the measured value can be determined based on the comparison result.

• Compare instrument classifications: DC comparators and AC comparators. DC bridges and potentiometers are DC comparators, and AC bridges are AC comparators.

• Typical instruments: comparative <br> <br> digital meters DC bridge

• The characteristics of digital instruments: The use of digital measurement technology, and directly display the measured size in the form of digital.

• Classification of digital instruments: Digital voltmeters, digital multimeters, and digital frequency meters are commonly used.

• Typical instrumentation: digital voltmeter <br> <br> smart meters

• The characteristics of smart meters: With the control and calculation functions of the microprocessor, this instrument can realize functions such as program control, memory, auto-calibration, self-diagnosis failure, data processing, and analysis and calculation.

• Classification of smart meters: Smart meters generally fall into two categories: one is a smart device with a microprocessor; the other is an automated test system.

• Typical Meter: Digital Storage Oscilloscope