Pa lleoliad dylai I defnyddio i mesur capacitance gyda amlfesurydd% 3f
Mae hyn angen dewis y yn cyfateb ystod seiliedig ar y brasamcan maint y cynhwysedd bod mesur:
2000p gêr, addas ar gyfer measuring capacitance llai na 2000pF;
20n gêr, addas ar gyfer mesuriad capacitance rhwng 2000pF a 20nF;
200n gêr, addas ar gyfer measuring capacitance rhwng 20nF a 200nF;
2μ gear, suitable for measuring capacitance between 200nF and 2μF;
20% ce� range, suitable for measuring capacitance between 2μF and 20μF.
Sut i mesur capacitance defnyddio pwyntydd amlfesurydd
Dewiswch y Rx1k or Rx100 level of y analog multimeter. The du prawf plwm yn connected i y positif polyn y capacitor, a y coch prawf plwm yn connected i'r negyddol polyn y y cynhwysydd yn yn hwn amser, a yna araf ffurflenni i agos infinity (∞Ω), Mae'n yn golygu bod y cynhwysydd is normal. A y cynhwysedd yw large; if mae'n nid dychwelyd i anfeidredd, mae'n golygu hynny y gollyngiad cyfredol y cynhwysydd yn mawr, a y pwyntydd arwyddion y gollyngiad ymwrthedd o y y alwminiwm electrolytig cynhwysydd dylai rhagori 200kΩ cyn it can be a ddefnyddir) ; if If the pwyntydd yn nid swing i y hawl yn holl, mae'n yn golygu y cynhwysydd wedi bod mewnol torri neu y electrolyt wedi sychu fyny a colli capasiti; if y pwyntydd siglenni mawr agos i 0% ce�, a nid dychwelyd, mae'n golygu hynny y cynhwysydd wedi torri i lawr.
Pethau to note pryd defnyddio amlfesur i mesur capacitance
Be sure to cut off the power and discharge before measuring. The method of discharging is to find a metal object such as a screwdriver, hold the exposed metal part on the insulating handle and put it on the two legs of the capacitor under test. Use a digital multimeter to measure the capacitance. Locate the capacitor block, then plug the two pins of the capacitor into the capacitance measurement socket after the capacitor is discharged. Wait until the changing reading on the LCD screen stabilizes. The actual value is the capacity of the capacitor on the side. If you want to measure leakage, you can use the resistance of a pointer multimeter. When measuring, the small-capacity capacitance multimeter can be placed on RX1K or RX100. When measuring the display on the dial, when the two test leads are connected to the two pins of the capacitor, the pointer will deflect clockwise, and then as the capacitor is fully charged due to no When the current flows, the pointer will move counterclockwise and return to infinity. The larger the angle of the pointer, the greater the capacity. During the deflection process, the pointer should swing at a constant speed so that it can return to infinity. This initially indicates that the capacitor has no leakage. If there is a certain point on the dial, If the needle at each position suddenly slows down or does not return, it means that the capacitor is leaking in a certain period. If the final display is infinity, it means there is no leakage. However, this can only be judged briefly. If you want to find the accurate value, you have to use a capacitance meter and a capacitor leakage tester. Or the observation characteristics on the oscilloscope, which is impossible for ordinary people to have. There is also a capacitor with a withstand voltage value. The withstand voltage value of electrolytic capacitors is usually written on it. Some ceramic capacitors are not marked on them, so be careful when choosing them.
