As ultracapacitors age, their Equivalent Series Resistance rises and their capacitance drops significantly below their original specification. These ultracapacitors typically need replacement to avoid process failure. Measuring the capacitance and Equivalent Series Resistance helps determine when these capacitors reach their end of life, avoiding both process failure and expensive, unnecessary preemptive replacement.
The Bonitron M3628PUT allows the user to charge a capacitor or bank to a specified voltage, and then discharge the bank. The display will then show the calculated capacitance and Equivalent Series Resistance of the bank.