Pointer multimeter and digital multimeter have their own advantages and disadvantages. Let's make a comparative analysis.
Comparison between pointer multimeter and Digital Multimeter pointer multimeter and Digital Multimeter have their own advantages and disadvantages.
Pointer multimeter is an ordinary instrument, and its reading indication is intuitive and vivid. The general reading is closely related to the swing angle of the pointer, so it is more intuitive.
Digital multimeter is an instantaneous sampling instrument. It samples every 0.3 seconds to display the measurement results, sometimes the results of each sampling are only very close, not exactly the same, and the reading results are not as convenient as the pointer.
Pointer multimeter generally has no amplifier, so the internal resistance is small. For example, the DC voltage sensitivity of MF- 10 model is100 kω/V ... The DC voltage sensitivity of MF-500 model is 20 kω/V.
Due to the internal operational amplifier circuit, the internal resistance of the digital multimeter can be very large, usually 1mω or more. (i.e. higher sensitivity can be obtained). This makes the influence on the tested circuit smaller and the measurement accuracy higher.
Because of the low internal resistance, pointer multimeter mostly uses discrete components to form shunt and voltage divider circuits. Therefore, the frequency characteristics are not uniform (relative to numbers), while the frequency characteristics of pointer multimeter are relatively better.
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