The pointer multimeter and the digital multimeter each have their own advantages and disadvantages. The following is a comparative analysis.
与数字万用表的比较指针式与数字式万用表各有优缺点。 Comparison of Analog Multimeter and Digital Multimeter Analog and digital multimeters have their own advantages and disadvantages.
Analog multimeter is an average meter, which has intuitive and visual reading indication. (Generally, the reading value is closely related to the pointer swing angle, so it is very intuitive).
Digital multimeters are instantaneous style meters. It takes 0.3 seconds to take a sample to display the measurement results. Sometimes the results of each sample are only very similar and not exactly the same. This is not as convenient as reading the pointer.
Analog multimeters generally do not have an amplifier inside, so the internal resistance is small. For example, the MF-10 type has a DC voltage sensitivity of 100 kohm / volt. The MF-500 has a DC voltage sensitivity of 20 kohm / volt.
由于内部采用了运放电路，内阻可以做得很大，往往在1M欧或更大。 Due to the internal use of an op amp circuit, the digital multimeter simulator can have a large internal resistance, often at 1M ohm or greater. (Ie higher sensitivity can be obtained). This makes the influence on the circuit under test smaller and the measurement accuracy higher.
Analog multimeters have small internal resistance, and often use discrete components to form a shunt and voltage division circuit. 的频率特性相对好一点。 Therefore, the frequency characteristics are not uniform (relative to digital), and the analog characteristics of the analog multimeter are relatively better.
The analog multimeter has a simple internal structure, so the cost is lower, the functions are less, the maintenance is simple, and the overcurrent and overvoltage capabilities are stronger. The digital multimeter uses a variety of internal oscillation, amplification, frequency division protection and other circuits, so it has more functions. For example, you can measure temperature, frequency (in a lower range), capacitance, inductance, signal generator and so on.
Digital multimeters have poor overload capacity due to the multi-purpose integrated circuit of the internal structure. Digital multimeters have lower output voltages (usually no more than 1 volt). It is inconvenient to test some components with special voltage characteristics (such as thyristors, light-emitting diodes, etc.).
Analog multimeters have higher output voltages (10.5 volts, 12 volts, etc.). The current is also large (e.g. MF-500 * 1 Euro file has a maximum of about 100 mA), which can easily test thyristors, light-emitting diodes, etc