Ponteiro multímetro teste eletrolítico capacitor
1. Porque a capacidade de eletrolítico capacitores é muito maior que da de comum fixo capacitores, quando medindo, você deve escolher a adequado intervalo para diferentes capacidades. De acordo para experiência, em geral, a capacitância entre 1 e 47μF can be medido com R×1k gear, e a capacitância maior que 47μF can be medido com R×100 gear.
2. Connect the red test lead of the multimeter to the negative pole, and the black test lead to the positive pole. At the moment of first contact, the pointer of the multimeter will deflect to the right with a large deflection (for the same electric resistance, the larger the capacity, the larger the swing), and then gradually to the left Turn around until it stops at a certain position. The resistance at this time is the forward leakage resistance of the electrolytic capacitor, which is slightly larger than the reverse leakage resistance. Practical use experience shows that the leakage resistance of electrolytic capacitors should generally be above several hundred kΩ, otherwise, it will not work normally. In the test, if there is no charging phenomenon in the forward and reverse directions, that is, the hands of the watch do not move, it means that the capacity has disappeared or the internal circuit is broken; if the measured resistance value is very small or zero, it means that the capacitor has a large leakage or has been broken down. Can no longer be used.
3. For electrolytic capacitors with unknown positive and negative signs, the above method of measuring leakage resistance can be used to identify them. That is, first randomly measure the leakage resistance, remember its size, and then exchange the test leads to measure a resistance value. The one with the larger resistance value in the two measurements is the positive connection method, that is, the black test lead is connected to the positive pole, and the red test lead is connected to the negative pole.
4. Use a multímetro para bloco eletricidade, use o método de frente e reverso carregando o eletrolítico capacitor, e estimativa a capacidade de o eletrolítico capacitor de acordo para o tamanho de o ponteiro balançando para a direita.
Indutor Detecção
1. O resistência valor de o medido cor código indutor é zero, e lá está um curto-circuito falha dentro ele.
2. O DC resistência valor de o medido cor código indutor é diretamente relacionado a o diâmetro de o esmaltado fio usado para vento o indutor bobina e o número de enrolamento voltas. As long as the resistance value can be measured, the measured color code inductor can be considered to be normal. of.
