Electronic measuring instruments are roughly classified into the following categories according to their working principles and uses. To

1. Multi-meter

Analog voltmeter, analog multimeter (that is, analog multimeter VOM), digital voltmeter, and digital multimeter (that is, digital multimeter DMM) belong to this category. This is a frequently used meter. It can be used to measure AC/DC voltage, AC/DC current, resistance value, capacitor capacity, inductance, audio level, frequency, transistor NPN or PNP current amplification factor β value, etc. To

2. Oscilloscope

An oscilloscope is an electronic instrument for measuring voltage waveforms. It can graphically display the law of the measured voltage signal changing with time. Using an oscilloscope can not only visually observe the overall change of the measured physical quantity, but also measure the voltage and current, compare the frequency and phase, and draw the characteristic curve through the displayed waveform. To

3. Signal generator

Signal generators (including function generators) provide signal sources for maintenance and debugging of electronic equipment and instruments. It is an oscillator that can generate a certain waveform, frequency and amplitude. For example: generate sine wave, square wave, triangle wave, ramp wave and rectangular pulse wave. To

4. Transistor characteristic diagram instrument

The transistor characteristic graph instrument is a special oscilloscope, which can directly observe various transistor characteristic curves and curvature clusters. For example: the input, output characteristics and feedback characteristics of the three connection methods of common emitter, common base and common collection of transistors; forward and reverse characteristics of diodes; voltage stabilization or Zener characteristics of zener tubes; it can measure the impact of transistors Through voltage, saturation current, β or α parameters, etc. To

5.Megger

A megohmmeter (commonly known as a shaker) is a simple, direct-reading instrument for checking electrical equipment and measuring high resistance. It is usually used to measure the insulation resistance of circuits, motor windings, and cables. Most of the megohmmeters are powered by hand-cranked generators, so they are called shaking meters. Since its scale is in megaohms (MΩ), it is called a megohmmeter. To

6. Infrared tester

Infrared tester is a non-contact temperature measuring instrument, which includes optical system and electronic circuit, which achieves the purpose of indication, display and control after information is modulated and linearized. At present, there are two types of infrared thermometers in use: photon temperature measurement and thermal temperature measurement. They are mainly used for temperature measurement of electric furnaces, crops, railway rails, deep-buried underground ultra-high voltage cable joints, fire protection, gas analysis, laser reception, etc. Control occasions. To

7. Integrated circuit tester

This type of instrument can test the functions and parameters of TTL, PMOS, and CMOS digital integrated circuits, as well as judge the chip models that have been erased, and perform online function tests and online status tests on integrated circuits. To

8.LCR parameter tester

The inductance, capacitance, and resistance parameter measuring instrument can not only automatically determine the nature of the component, but also display the symbol graphic and display its value. It can also measure parameters such as Q, D, Z, Lp, Ls, Cp, Cs, Kp, Ks, and display equivalent circuit graphics. To

9. Spectrum analyzer

Spectrum analyzers are widely used in frequency domain signal analysis, testing, research, and maintenance. It can measure the amplitude and frequency of the signal at the same time, test and compare the composition of multiple signals and analyze the signal. It can also test the signals of mobile phone logic and radio frequency circuits. For example: control signal, baseband signal of logic circuit, local oscillator signal, intermediate frequency signal, transmission signal of radio frequency circuit, etc. To

In addition to the above commonly used electronic measuring instruments, there are also time measuring instruments, bridges, phase meters, dynamic analyzers, optical measuring instruments, strain gauges, flow meters, etc.