What advantages do analog multimeters and digital multimeters have over each other?
A pointer multimeter is an average value instrument It is intuitive Visual reading indication
(Generally, the reading value is closely related to the pointer swing angle, so it is very intuitive)
A digital multimeter is an instantaneous style 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 for reading results as pointer based methods
A pointer multimeter generally does not have an amplifier inside So the internal resistance is relatively small For example, the MF-10 model has a DC voltage sensitivity of 100 kiloohms per volt This can be considered a beautiful person The DC voltage sensitivity of MF-500 model is 20 kiloohms per volt
The digital multimeter uses an operational amplifier circuit internally The internal resistance can be made very large Often at 1M euros or more (i.e. can achieve higher sensitivity) This makes the impact on the tested circuit smaller High measurement accuracy
Pointer multimeters have low internal resistance and often use discrete components to form shunt and voltage divider circuits So the frequency characteristics are uneven (compared to digital ones) The frequency characteristics of a pointer multimeter are relatively better
The pointer type multimeter has a simple internal structure, so the cost is relatively low Less functionality Easy to maintain Strong overcurrent and overvoltage capability
The digital multimeter uses various oscillations and amplifiers internally Frequency division The protection circuit has multiple functions, such as measuring temperature Frequency (in a lower range) Capacitors, inductors Or make a signal generator, etc
Due to the use of integrated circuits in the internal structure, the overload capacity is poor (However, some now have automatic gear shifting, automatic protection, etc., but the use is more complex) It is generally not easy to repair after damage
The output voltage of a digital multimeter is relatively low (usually not exceeding 1 volt) It is inconvenient to test some components with special voltage characteristics, such as thyristors, light-emitting diodes, etc
The output voltage of the pointer multimeter is relatively high (including 10.5 volts, 12 volts, etc.)
The current is also large (such as MF-500 * 1 Euro range * with a maximum of about 100mA), which makes it easy to test thyristors, light-emitting diodes, etc
For beginners, a pointer multimeter should be used
For non beginners, two types of instruments should be used
