In laboratories, schools, factories, the military, and automobile manufacturing, commonly used instruments include multimeters, oscilloscopes, spectrum analyzers, logic analyzers, function signal generators, DC power supplies, and LCR testers. They cover a wide range of needs from basic electrical measurements to complex signal analysis and are essential tools in various fields.

A multimeter is a portable multifunctional instrument that can measure DC and AC voltage, current, and resistance. It also supports diode testing and continuity testing. It is easy to operate and is suitable for quickly detecting power supply voltage, determining whether components are damaged, and confirming whether circuit connections are normal. An oscilloscope is a dynamic signal analysis tool that can observe the changes of electrical signals over time in real time. It is suitable for measuring the amplitude, frequency, period, and rise/fall time of signals. It can intuitively display waveforms and is the preferred tool for analyzing the dynamic behavior of periodic signals (such as sine waves, square waves) and non-periodic signals.

A spectrum analyzer is mainly used for analyzing the characteristics of frequency domain signals. It is particularly suitable for testing radio frequency circuits and communication systems. It can detect the spectrum distribution, harmonic distortion, and interference of signals. Logic analyzers are specialized in capturing and analyzing digital signals. They are often used to debug microcontrollers, digital circuits, and embedded systems. By checking changes in logic levels, they help engineers discover data transmission errors or signal mismatch problems.

In addition, function signal generators can generate a variety of waveform signals such as sine waves, square waves, and triangle waves, and are widely used in circuit performance testing and equipment calibration. DC power supplies provide stable and adjustable DC voltage and current. They are indispensable power supply equipment in laboratories and production lines, and are used to power test circuits or equipment. LCR testers are used to measure the inductance, capacitance, and resistance of components. They are suitable for component quality inspection and parameter verification, and are important tools for precision measurement.

These instruments are used in laboratories and schools for teaching experiments and scientific research, helping students and researchers to gain a deep understanding of circuit principles and signal characteristics. In factories and automobile manufacturing, they are widely used in production line testing, equipment debugging, and quality control to ensure that product performance meets standards. In the military, these instruments are used in the development, testing, and maintenance of electronic equipment to ensure the reliability and stability of key technologies such as communication systems and weapons and equipment. Together, they constitute the core tools in the field of testing and analysis, supporting the diverse needs from basic measurements to the development of high-precision and cutting-edge technologies.