In the process of using capacitors, we must pay attention to mastering the measurement method of capacitors. This is the key to identifying the quality of capacitors. So, what are the methods for measuring film capacitors? Using scientific methods to measure capacitance is the key to ensuring the safety and life of capacitors.
First, you can use a multimeter to test the capacitor, and the method is to use the resistance range. Practice has proved that the charging process of the capacitor can also be observed using a digital multimeter, which actually reflects the change of the charging voltage in discrete digital quantities. Assuming that the measurement rate of the digital multimeter is n times/second, when observing the charging process of the capacitor, n independent and increasing readings can be seen every second.
Next, we will introduce the method of using the resistance range of the digital multimeter to detect capacitors, which is very practical for instruments that do not have a capacitance range. This method is suitable for measuring large-capacity capacitors of 0.1μF to several thousand microfarads. Set the digital multimeter to the appropriate resistance range, and the red and black test pens touch the two poles of the capacitor Cx to be measured. At this time, the displayed value will gradually increase from "000" until the overflow symbol "1" is displayed. If it always displays "000", it means that the capacitor is short-circuited; if it always displays overflow, it may be that the internal circuit between the capacitors is open, or the selected resistance range is inappropriate. When checking electrolytic capacitors, it is necessary to pay attention to the red test lead (with positive charge) connected to the positive electrode of the capacitor and the black test lead connected to the negative electrode of the capacitor.
The measurement of film capacitors is crucial. When purchasing capacitors, it is not only necessary to pay attention to various parameters, but the most important thing is to know how to measure and understand whether it is damaged. This is the most important detail in the process of using capacitors.
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