DIN EN 62391-1:2016-09

This part of IEC 62391 applies to fixed electric double-layer capacitors mainly used in DC circuits of electric and electronic equipment. This document establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. Essential terms for application of the document are explained and defined in the chapter Terms. In this context, the type is a group of components with the same design characteristics and the same structure, which can be grouped together for type approval testing and quality assessment control due to similar manufacturing techniques. The style is a subset of a type, generally based on specific dimensions; a type may include several embodiments, generally differing in mechanical details. The DC capacitor is a capacitor essentially designed for use with DC voltage. The rated capacitance is the capacitance value for which the capacitor is designed and which is usually indicated on it. The rated voltage is the highest DC voltage or peak pulse voltage that may be continuously or repeatedly applied to the capacitor at temperatures between the lower category temperature and the rated temperature. The chapter Test and Measurement Requirements explains the test conditions. Unless otherwise specified, all tests shall be performed at normal climate for tests according to IEC 60068-1:2013. The measurements shall be carried out at a temperature of 20 ± 2 °C. All measurements are to be carried out after thermal equilibrium has been reached. The capacitor shall be charged up to the rated voltage and held for 30 minutes by means of a DC power source. The capacitor shall be discharged using a suitable discharge device. During heat treatment the capacitor shall be stored at the specified temperature until the entire capacitor has reached this temperature (thermal equilibrium). General tests include, but are not limited to, visual inspection and testing of dimensions, capacitance and internal resistance, residual current, float voltage, mechanical resistance of terminals, solder heat resistance and solderability, rapid temperature cycling, oscillation, solvent resistance of the component and marking, passive flammability, and pressure relief. The normative Annex A describes the classification of capacitors according to their capacitance and internal resistance value depending on the application. The measurements of capacitance and internal resistance according to the constant current discharge method and the direct current resistance method, respectively, require longer measurement times depending on the rated values of the product, provided that the measurement conditions are standardized with the degree of accuracy of these measurement methods. Informative Annex B contains measurement methods for capacitance and low resistance using the low frequency AC method (reference method); Informative Annex C describes the thermal equilibrium time of capacitors (thermal equilibrium setting time) and of capacitors as a reference value when determining the thermal soaking period for pretreatment. Informative Annex D explains the general concept of charging and discharging efficiency and measuring current. Informative Annex E contains the procedure for setting the measuring current for a capacitor with unknown nominal internal resistance. The responsible committee is DKE/K 611 "Kondensatoren" ("Capacitors") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.