the standardized measuring condition for e-caps is an ac measuring method with 0.5 v at a frequency of 100/120 hz and a temperature of 20 °c. for tantalum capacitors a dc bias voltage of 1.1 to 1.5  v for types with a rated voltage ≤2.5 v, or 2.1 to 2.5 v for types with a rated voltage of >2.5 v, may be applied during the measurement to avoid reverse voltage.