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BS EN 62391-1:2006 Fixed electric double-layer capacitors for use in electronic equipment - Generic specification, 2006
- BS EN 62391-1-word-copytom.pdf [Go to Page]
- 1 General [Go to Page]
- 1.1 Scope
- 1.2 Normative references
- 2 Technical data [Go to Page]
- 2.1 Unit and symbols
- 2.2 Terms and definitions
- 2.3 Preferred values [Go to Page]
- 2.3.1 General
- 2.3.2 Preferred values of rated capacitance
- 2.4 Marking [Go to Page]
- 2.4.1 General
- 2.4.2 Coding
- 3 Quality assessment procedures [Go to Page]
- 3.1 General
- 3.2 Primary stage of manufacture
- 3.3 Structurally similar components
- 3.4 Declaration of conformity
- 3.5 Test schedule and requirement for initial assessment
- 4 Tests and measurement procedures [Go to Page]
- 4.1 General
- 4.2 Standard atmospheric conditions [Go to Page]
- 4.2.1 Standard atmospheric conditions for testing
- 4.2.2 Recovery conditions
- 4.2.3 Referee conditions
- 4.2.4 Reference conditions
- 4.3 Drying
- 4.4 Visual examination and check of dimensions [Go to Page]
- 4.4.1 Visual examination
- 4.4.2 Dimensions (gauging)
- 4.4.3 Dimensions (detail)
- 4.5 Capacitance [Go to Page]
- 4.5.1 Constant current discharge method [Go to Page]
- Measuring circuit
- 4.5.1.2 Measuring method
- 4.5.1.3 The relevant specification shall prescribe
- 4.5.2 Constant resistance charging method [Go to Page]
- 4.5.2.1 Measuring circuit
- 4.5.2.2 Measuring method
- 4.5.2.3 The relevant specification shall prescribe
- 4.6 Internal resistance [Go to Page]
- 4.6.1 AC resistance method [Go to Page]
- Measuring circuit
- 4.6.1.2 Measuring method
- 4.6.2 DC resistance method [Go to Page]
- 4.6.2.1 Measuring method
- 4.6.2.2 The relevant specification shall prescribe
- 4.7 Leakage current [Go to Page]
- 4.7.1 Measuring method
- 4.7.2 The relevant specification shall prescribe:
- 4.8 Self-discharge [Go to Page]
- 4.8.1 Measuring method (refer to Figure 6)
- 4.8.2 The relevant specification shall prescribe
- 4.9 Robustness of terminations [Go to Page]
- 4.9.1 Test Ua1 – Tensile
- 4.9.2 Test Ub – Bending (half of the sample)
- 4.9.3 Test Uc – Torsion (remaining sample)
- 4.9.4 Test Ud – Torque (for terminations with threaded studs or screws and for integral mounting devices)
- 4.9.5 Visual examination
- 4.10 Resistance to soldering heat [Go to Page]
- 4.10.1 When prescribed by the relevant specification the capacitors shall be dried using the method of 4.3.
- 4.10.2 Unless otherwise stated in the relevant specification, one of the following tests as set out in the same specification shall be applied.
- 4.10.3 The period of recovery shall, unless otherwise specified by the detail specification, be not less than 1 h nor more than 2 h, except for surface mount capacitors, for which the period of recovery shall be 24 h ± 2 h.
- 4.10.4 For all capacitors, except surface mount capacitors, the following shall apply:
- 4.11 Solderability [Go to Page]
- 4.11.1 Capacitors with leads [Go to Page]
- 4.11.1.1 Test conditions
- 4.11.1.2 The terminations shall be examined for good tinning as evidenced by free flowing of the solder with wetting of the terminations.
- 4.11.1.3 When the solder bath method is not applicable, the relevant specification shall define both the method, test conditions and the requirements.
- 4.11.2 Surface mount capacitors [Go to Page]
- 4.11.2.1 Final inspection, measurements and requirements
- 4.12 Rapid change of temperature [Go to Page]
- 4.12.1 The measurements prescribed in the relevant specification shall be made.
- 4.12.2 The capacitors shall be subjected to Test Na of IEC 60068-2-14, using the degree of severity as prescribed in the relevant specification.
- 4.12.3 After recovery, the capacitors shall be visually examined. There shall be no visible damage.
- 4.13 Vibration [Go to Page]
- 4.13.1 The measurements prescribed in the relevant specification shall be made.
- 4.13.2 The capacitors shall be subjected to Test Fc of IEC 60068-2-6, using the mounting method and the degree of severity prescribed in the relevant specification.
- 4.13.3 When specified in the detail specification, during the last 30 min of the vibration test an electrical measurement shall be made in each direction of movement to check intermittent contacts, or open- or short-circuits.
- 4.13.4 After the test the capacitors shall be visually examined. There shall be no visible damage. When capacitors are tested as specified in 4.17.3, the requirements shall be stated in the detail specification.
- 4.13.5 The measurements prescribed in the relevant specification shall then be made.
- 4.14 Damp heat, steady state [Go to Page]
- 4.14.1 The measurements prescribed in the relevant specification shall be made.
- 4.14.2 The capacitors shall be subjected to Test Cab of IEC 60068-2-78, using the degree of severity corresponding to the detail specification.
- 4.14.3 The measurements prescribed in the relevant specification shall then be made.
- 4.15 Endurance [Go to Page]
- 4.15.1 Initial measurements
- 4.15.2 The tests of IEC 60068-2-2 apply as follows:
- 4.15.3 The relevant specification shall prescribe:
- 4.15.4 Unless otherwise specified in the relevant specification, the voltage to be applied during the test shall be selected from the following:
- 4.15.5 The capacitors shall be placed in the test chamber in such a manner that:
- 4.15.6 After the specified period, the capacitors shall be allowed to cool to standard atmospheric conditions for testing and where specified in the relevant specification, the capacitors shall be subjected to recovery.
- 4.15.7 The capacitors shall then be visually examined.
- 4.15.8 The measurements prescribed in the relevant specification shall then be made. A capacitor shall be considered to have failed when the requirements of the relevant specification during or at the end of the test are not satisfied.
- 4.16 Storage [Go to Page]
- 4.16.1 Storage at high temperature [Go to Page]
- 4.16.1.1 The measurements prescribed in the relevant specification shall be made.
- 4.16.1.2 The capacitors shall be subjected to Test Ba of IEC 60068-2-2, using the following severities:
- 4.16.1.3 After recovery for at least 16 h, the measurements prescribed in the relevant specification shall be made.
- 4.16.2 Storage at low temperature [Go to Page]
- 4.16.2.1 The measurements prescribed in the relevant specification shall be made.
- 4.16.2.2 The capacitors shall be subjected to Test Ab of IEC 60068-2-1. The capacitors shall be stored at – 40 °C for either a period of 4 h after thermal stability has been reached, or for 16 h, whichever is the shorter period.
- 4.16.2.3 After recovery for at least 16 h, the measurements prescribed in the relevant specification shall be made.
- 4.17 Characteristics at high and low temperature [Go to Page]
- 4.17.1 The degree of severity for these tests shall be the same as for the dry heat and cold tests. Tests at intermediate temperatures may be prescribed by the relevant specification.
- 4.17.2 Dry heat
- 4.17.3 Cold
- 4.17.4 The capacitors shall not exceed the limits prescribed in the relevant specification.
- 4.18 Component solvent resistance [Go to Page]
- 4.18.1 Initial measurements
- 4.18.2 The components shall be subjected to Test XA of IEC 60068-2-45, with the following details:
- 4.18.3 The measurements prescribed in the relevant specification shall then be made and the specified requirements be met.
- 4.19 Solvent resistance of marking [Go to Page]
- 4.19.1 The components shall be subjected to Test XA of IEC 60068-2-45, with the following details:
- 4.19.2 After the test the marking shall be legible.
- 4.20 Passive flammability [Go to Page]
- 4.20.1 The test shall be made according to IEC 60695-11-5.
- 4.20.2 The capacitor under test shall be held in the flame in the position which best promotes burning (if this position is not given in the detail specification it shall be evaluated by pre-testing). Each specimen shall only be exposed once to the flame.
- 4.20.3 The smallest, a medium (in the case of more than four case sizes), and the biggest case size shall be tested. Of each case size, three specimens of the maximum and three specimens of the minimum capacitance shall be tested, resulting in six specimens per case size.
- 4.20.4 For time of exposure to flame and burning time, see Table 6. If applicable, the detail specification shall specify the category of passive flammability.
- 4.20.5 Requirements
- 4.21 Pressure relief (if applicable) [Go to Page]
- 4.21.1 d.c. test [Go to Page]