Electronic measuring instruments are roughly classified into the following categories according to their working principles and uses.
Multimeters: Analog voltmeters, analog multimeters (that is, pointer multimeters VOM), digital voltmeters, and digital multimeters (that is, digital multimeters DMM) are all in 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.
Oscilloscope: It is an electronic instrument that measures the voltage waveform. It can display the law of the measured voltage signal changing with time in a graph. Using an oscilloscope can not only visually and visually observe the change of the measured physical quantity, but also use it to display the waveform, measure voltage and current, compare frequency and phase, and draw characteristic curves.
Signal generator: The signal generator (including function generator) provides a signal source for maintenance and debugging of electronic equipment and instruments. It is an oscillator that can produce a certain waveform, frequency and amplitude. For example: generating sine wave, square wave, triangle wave, ramp wave and rectangular pulse wave.
Transistor characteristic graph 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 connections of transistor common emitter, common base and common set; the forward and reverse characteristics of the diode; the voltage regulation or Zener characteristics of the voltage regulator; it can measure the impact of the transistor. Wear voltage, saturation current, self or a parameter, etc.
Megohmmeter: Commonly known as a shaking meter, it 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. Megohmmeters are mostly powered by hand-cranked generators, so they are called shakemeters. Because its scale is in units of megohms (MΩ), it is called a megohmmeter.
Infrared tester: It is a non-contact temperature measuring instrument. It includes an optical system and an electronic circuit. It modulates and linearizes information to achieve the purpose of indication, display and control. At present, the infrared thermometers that have been applied include photon temperature and thermal thermometers, which are mainly used for temperature measurement such as electric furnaces, crops, railway rails, deep underground ultra-high voltage cable joints, fire protection, gas analysis, laser reception, etc. Control occasions.
Integrated circuit tester: This type of instrument can test TI1, PM0S, CM0S digital integrated circuit functions and parameters, and can also determine the chip type of the erased word and the online functional test and online status test of the integrated circuit.
LCR parameter tester: Inductance, capacitance, resistance parameter tester, not only can automatically determine the nature of the component, but also can display the symbol graphics and display its value. It can also measure Q, D, Z, Lp, Ls, Cp, Cs, Kp, Ks and other parameters, and displays the equivalent circuit graph.
Spectrum analyzer: The spectrum analyzer has a wide range of applications in frequency domain signal analysis, testing, research, and maintenance. It can measure the amplitude and frequency of signals at the same time, test and compare the composition of multiple signals and analyze signals. It can also test the signal of mobile phone logic and RF circuit. For example: the control signal of the logic circuit, the baseband signal, the local oscillator signal of the radio frequency circuit, the intermediate frequency signal, the transmission signal and so on.
In addition to the above commonly used electronic measuring instruments, there are time measuring instruments, electric bridges, phase meters, dynamic analyzers, optical measuring instruments, strain gauges, flow meters, etc.
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