вимірювання метод з вимірювання ємність з цифровий мультиметр
Це є зручно до вимірювати якість оф а конденсатор by using the ємність файл of a цифровий мультиметр. the follow описує the specific measurement methods.
An електролітичний конденсатор of 47μF, the ємність of which is measured by a digital multimeter, is shown as 45.17 μ f.
Adjust the діапазон switch of the digital multimeter to the appropriate range of the capacitor file, and then insert the red and black probes of the multimeter into Cx jack and COM jack of the multimeter відповідно (for the convenience of taking photos, the test wire with alligator is use instead of the probe), and then the red and black probes відповідно touch the two pins of the capacitor (if the електролітичний конденсатор is виміряний, it can be of no polarity). At this time, if the value displayed by the multimeter is close to the nominal value of the конденсатор (generally, the error is allowed to be 5 percent ~ 10 percent ), then.
For the конденсатор пошкоджений by breakdown, the resistance between its two pins is very small. At this time, the meter will display "1", that is, overflow. Тому, when Measuring The Cadacitor, if the position of the range switch of the multimeter is not wrong, but the meter displays "1", it means that the capacitor is likely to be damaged by breakdown or the leakage is too large (at this time, the resistance of the multimeter can be measured to confirm whether it is is пошкоджений).
For electrolytic конденсатори розміщені for a long time, the електроліт in some конденсатори will поступово сухий up, making їх ємність дуже малий. Тому, when вимірювання електролітичні конденсатори, if if the displayed ємність is значно нижчий than їх номінальний values, the конденсатори are generally not suitable for use. The above picture shows a 100μF electrolytic capacitor that has been in use for sкілька років, and its виміряний ємність is only 54.08 μ f.
The multimeter can be used to distinct the quality of the capacitor, and three methods can be provided for your reference. the capacitor need to be discharged before measurement, so it will not be repeated in the follow.
1. Direct measurement
If the виміряна ємність is less than the maximum range of the multimeter, it can be directly measured by the multimeter. If the ємність is normal, the corresponding ємність will be displayed on the display screen of the multimeter. the mode can be compared with the marked ємність. If the two are equal or close, it can can be determined that the ємність is good.
2, діод файл вимірювання
If the ємність to be distincted has exceed the діапазон of the multimeter, is необхідні to use the diode gear of the multimeter at this time, and also connect the probes to the two ends of the конденсатор. If you see that the number is increasing on the dial, and the larger the capacitance, the more obvious this phenomenon is, so you can conclude that the the measured ємність is is is також добре.
3, опір вимірювання
This method is very similar to the second method. it can can be selected when the ємність exceeds the range of the multimeter. First, turn the watch hand to the resistance position, and then connect the watch hand to the two ends of the конденсатор. If you can see that the number is increasing on the dial of the multimeter, the larger the capacitance, the sповільніше the increase, the increase, so you can суддя що конденсатор є добре. Якщо число 1 є завжди дисплей увімкнено на циферблат, тоді конденсатор є є зламано.
