Judging Capacitor quality by using multimeter

Depending on the capacity size of the electrolytic capacitor, commonly used multimeter's of R×10, R×100, R×1k.

Red black table pen separately connects capacitor negative electrode (before each test) capacitor discharge) is determined by the deflection of table needle capacitor quality.

If the needle immediately comes right into the right and then slowly returns to the left place generally capacitors are good.

If the table needle does not turn back after it is raised, it indicates that the capacitor has been breakdown.

If the table needle comes back gradually back to certain position stops, it means that capacitor has been leakage.

If the table needle doesn't hold up, it indicates that capacitor electrolytes have dried up pushing off capacity.

Some leakage capacitors, using above methods cannot accurately judge good or bad.

When voltage value of capacitor is larger than that inside multimeter, according to the characteristic of small leakage current when electrolytic capacitor is charging forward charging, when leakage current is large when reverse charging, it can adopt R×10K block.

Reverse charge of capacitor is used to observe whether the stop position of the needle is stable (i.e. whether reverse leakage current is constant) thus judging capacitor quality is higher accuracy.

Black table pen capacitor negative electrode, red table pen connected to capacitor cathode, table needle quickly swings, then gradually retreat somewhere stays motionless, then indicate capacitor is good.

Capacitors whose tables remain unstable or move slowly right after staying at one position have been leakage and cannot continue using.

Table needles generally stay and stabilize within the range of calibration scales.