Electrolytic capacitors how to use a digital multimeter to measure the good and bad
The capacitance is measured directly with the capacitance file of the digital multimeter.
Digital multimeter can measure 20mF (here "mF" read as "millifar", 1mF = 1000μF) below the capacitance (the previous multimeter can only measure a maximum of 200μF capacitance), so to determine the capacitance is good or bad, you can use the multimeter to measure its capacity. To determine the capacitance, you can use a multimeter to measure the capacity of the capacitor.
Multimeter measurement of electrolytic capacitors.
As the error of electrolytic capacitors are large, the capacity displayed is normal. Measurement of large-capacity electrolytic capacitors, if the range is not exceeded, the display reading has been "1", indicating that the capacitor leakage is large or has been damaged by breakdown. If the measured capacitance is much smaller than the nominal value, the capacitor internal electrolyte dry, generally should not be used.
2, with a digital multimeter diode file to determine the good and bad
With a digital multimeter diode file to determine the capacitance of good and bad. As the diode file of the test current is larger (mostly more than 1mA), through the diode file measurement can be faster measurement of large capacitance breakdown damage. Measurement, with a multimeter pen contact capacitance of the two pins, if it is a good capacitor, the first dozen seconds, the diode file display readings may be "0.000", after the display readings will gradually increase until the display is "1". If the measurement, the multimeter shows a long time for 0.000 readings (or readings have been very small), that the capacitor has been damaged.
How to measure the voltage of AC contactor A1 and A2 with a multimeter under energized state?
Use the multimeter AC voltage 500 volts directly connected to the A1 and A2 can be
Selection Use the multimeter AC voltage gear 750V gear, look at the jack position, black black pen to com. red pen to V jack, red and black pens were placed on both ends of the A1A2, measured the voltage value
Multimeter hit to the highest grade, according to the display down! If the pointer type must be done, the pointer should be in the middle position, such as digital electronic table, the purpose of reducing the measurement error, but also to reduce to the appropriate file!
With a multimeter AC voltage file, 250v file (estimated voltage 220v) or 500v file (estimated voltage 380v) measurement. Connect the two pens to the A1A2 terminals and watch the reading.
Simple enough to say the question off the top of your head without thinking about it, first measure with Ac high level to see if the resultant value doesn't work or isn't right, then measure with Dc high level.
Directly with a multimeter playing in the 600V voltage gear, with the pen on the line, AC power does not have a positive and negative poles, the pen to measure A1 and A2, with or without power at a glance!
First determine the known end voltage to be measured, the vast majority of factory power ≤ 380V AC, civilian are 220V AC, set the multimeter AC 500 volts, direct measurement can be!
