The advantages of using a conventional multimeter and a digital multimeter
The analog multimeter is an average meter. It has an intuitive and vivid reading indication.
The digital multimeter is an instantaneous sampling type instrument. It takes a sample every 0.3 seconds to display the measurement results. Sometimes the results of each sampling are only very similar, not exactly the same. This is not as convenient as the pointer type for reading the results.
Pointer 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 kiloohms/volt, which is quite impressive. The MF-500 type has a DC voltage sensitivity of 20 kiloohms/volt. volt.
Because the digital multimeter uses an operational amplifier circuit inside, the internal resistance can be made very large, often 1M ohm or more (that is, higher sensitivity can be obtained). This makes the impact on the circuit under test smaller. The accuracy is higher.
Because the internal resistance of the analog multimeter is small, and discrete components are mostly used to form a shunt and voltage divider circuit, the frequency characteristics are uneven (compared to digital ones). The frequency characteristics of the analog multimeter are relatively better.
The internal structure of the analog multimeter is simple, so the cost is lower. It has fewer functions, simple maintenance, and strong overcurrent and overvoltage capabilities.
The digital multimeter uses a variety of oscillation, amplification, frequency division, protection and other circuits internally, so it has many functions. For example, it can measure temperature, frequency (in a lower range), capacitance, inductance, or serve as a signal generator, etc.
Since the internal structure mostly uses integrated circuits, the overload capacity is poor. (However, some now have automatic gear shifting, automatic protection, etc., but their use is more complicated). It is generally not easy to repair after damage.
The output voltage of a digital multimeter is low (usually no more than 1 volt). It is inconvenient to test some components with special voltage characteristics (such as thyristors, light-emitting diodes, etc.)
