A digital multimeter is an instantaneous meter. It takes a sample every 0.3 seconds to display the measurement results, and sometimes the results of each sampling are very similar, not exactly the same, which is not as convenient as the pointer type for reading the results. The pointer multimeter generally does not have an amplifier inside, so the internal resistance is small.
Due to the internal use of the operational amplifier circuit in the digital multimeter, the internal resistance can be made very large, often 1M ohms or greater. (ie higher sensitivity can be obtained). This makes the impact on the circuit under test can be smaller, and the measurement accuracy is higher.
Due to the small internal resistance of the pointer multimeter, discrete components are often used to form a shunt and voltage divider circuit. Portanto, the frequency characteristics are uneven (compared to the digital type), and the frequency characteristics of the digital multimeter are relatively better.
The internal structure of the pointer multimeter is simple, so the cost is lower, the function is less, the maintenance is simple, and the overcurrent and overvoltage ability is strong.
The digital multimeter uses a variety of oscillation, amplification, frequency division protection and other circuits inside, so it has many functions. For example, you can measure temperature, frequency (in a lower range), capacitance, indutance, make a signal generator, and so on.
Desde o interno estrutura de o digital multímetro usa integrado circuitos, o sobrecarga capacidade é pobre, e é é geralmente não fácil para reparar depois dano. DMMs têm baixa saída tensões (geralmente não mais than 1 volt). It é inconveniente para testar alguns componentes com especial tensão características (tal como tiristores, emissores de luz diodos, etc.). O ponteiro multímetro tem a superior saída tensão. O corrente é também grande, e é é conveniente para teste tiristores, emissores de luz diodos, etc.
A ponteiro multímetro deveria ser usado para iniciantes, e dois metros deveria ser usado para não iniciantes.
