How to measure capacitance with a digital multimeter? Digital multimeter capacitance good or bad steps
1, judge the polarity, the first multimeter to 100 or 1K ohm gear, assuming that a positive pole, so that the black pen and it connected to the red pen and another pole connected to write down the resistance, and then the capacitor discharge, that is, so that the two poles are in contact with each other, and then change the pen to measure the resistance, the resistance of a large time of the black pen connected to the positive pole of the capacitor.
2, the multimeter adjusted to the ohm gear appropriate gear, gear selection principle is: 1μF capacitance with 20K gear, 1-100μF capacitance with 2K gear, greater than 100,μF with 200 gear.
3, and then use the DT2201D multimeter red pen connected to the positive terminal of the capacitor, the black pen connected to the negative terminal of the capacitor, if the display slowly increases from 0, and finally shows the overflow symbol 1 is the capacitor is normal, if it always shows 0, then the capacitor is short-circuited internally, and if it always shows 1, then the capacitor is disconnected internally.
Digital multimeter capacitance good or bad steps
1,Detecting small capacitors below 10pF
Because the capacity of fixed capacitors below 10pF is too small to be measured with a multimeter, it can only be qualitatively checked whether there is leakage, internal short-circuit or breakdown phenomenon. Measurement, you can choose the multimeter R × 10k block, with two pens were connected to any two pins of the capacitor, the resistance should be infinity. If the measured resistance (pointer swings to the right) is zero, then the capacitor leakage damage or internal breakdown.
2, the detection of 10PF ~ 0.01μF fixed capacitors
Detection of 10PF ~ 0.01μF of fixed capacitors whether charging phenomenon, and then determine its good or bad, the multimeter can choose R × 1k block, the two transistor β-value are more than 100, and penetration current should be small. Can choose 3DG6 and other models of silicon transistors to form a composite tube. The red and black pens of the multimeter are connected to the emitter e and collector c of the composite tube. Due to the amplifying effect of the composite transistor, the measured capacitance of the charge and discharge process to be amplified, so that the multimeter pointer swing amplitude increase, so as to facilitate observation. It should be noted that: in the test operation, especially in the measurement of smaller capacitance, to repeatedly switch the measured capacitance pin contact A, B two points, in order to clearly see the multimeter pointer swing.
3,Detection of fixed capacitance above 0.01μF
Detecting fixed capacitance above 0.01μF, the multimeter can be used to directly test the capacitor with or without charging process and internal short-circuit or leakage, and according to the magnitude of the pointer swing to the right to estimate the capacitance of the capacitor.
