The difference between multimeter test and oscilloscope test
Multimeters and oscilloscopes are common tools
Multimeters and oscilloscopes are all too familiar to electronics engineers. It can be said to be an indispensable tool for R&D, debugging and maintenance. Of course the functions of a multimeter and an oscilloscope are completely different.
multimeter
There are two types of multimeters: pointer type and digital type; the pointer type has basically been eliminated, and now basically digital multimeters are used.
The multimeter can be used to measure resistance, AC and DC voltage, AC and DC current, diode, capacitance, frequency, etc. The multimeter is simple and easy to use. As long as the gear is dialed to the functional gear that needs to be measured, the measurement can be performed.
Special attention should be paid when using a multimeter to measure the current. To measure the current, the multimeter needs to be connected in series to the circuit, and the red test lead needs to be inserted into the socket suitable for the range. If the current exceeds the range, the fuse of the multimeter will be burned.
oscilloscope
Oscilloscopes and multimeters are different, and multimeters can only display measured values. The oscilloscope can quickly and continuously measure the signal, and draw it as a curve and display it on the screen.
Oscilloscopes are used in a wide variety of applications. Signals invisible to the naked eye can be converted into images. We can analyze the changes of various signals and data according to the measured signal waveform.
The oscilloscope has many functions and menus, and it requires a certain basic knowledge to use it.
There are two types of multimeters: analog and digital.
The pointer of the analog watch swings flexibly, which makes it easier to judge the changes in the circuit.
oscilloscope
The multimeter intelligently measures DC signals and low-frequency pure AC signals more accurately. For most AC signals and digital signals, only an oscilloscope can be used to detect them. Because the oscilloscope can display various signal waveforms in the detected electronic circuit on the oscilloscope tube, it enables people to accurately judge whether the circuit is normal in the maintenance of equipment and circuit debugging.
The electrical signal in the circuit, especially the electronic circuit with weak current, may be complex, random, and transient. At this time, an oscilloscope can be used to analyze the signal characteristics and estimate its electrical parameters. The multimeter can only measure the electrical parameters of typical electrical signals in steady state, which is not convenient for the measurement and analysis of complex electrical signal parameters. The multimeter is not only suitable for traditional strong current line measurement, but also can measure some parameters in weak current line. Oscilloscopes are widely used in electronic circuits, and are less suitable for strong electric circuits.
Needless to say, the various functions of the multimeter are known to everyone, but when measuring signals, the multimeter can only measure a rough voltage to initially judge and guess whether there is a fault at the measurement point, and it cannot be accurately judged, but the oscilloscope can be intuitively seen Whether the waveform of the measurement point is deformed or lost signal can accurately judge whether there is a fault or not, and whether it is distorted. Visually see if there is any problem
