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项目名称
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章节号
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测试方法
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Measurement method 1 for capacitance and internal resistance (constant current
discharge)
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5.5
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Measuring method 1A (class 1, 2, 3 and 4)
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5.5.3.2
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Unless otherwise specified in the detail specification, the measuring conditions shall be as shown in Table 1. The constant charging current (Icc) shall be able to charge the capacitor with 95 % charging efficiency and is set using the rated voltage (UR) and the nominal internal resistance (RN) by Icc (= UR /38 RN). The constant discharge currents are set for capacitance measurement and internal resistance respectively, corresponding to the nominal capacitance of the capacitor.
The measuring procedure shall be as follows:
a) the capacitor shall be charged with the constant charging current;
b) when the output voltage of the power supply reaches the specified value, the charging of the capacitor shall be continued with the constant voltage;
c) then the capacitor shall be discharged through the constant current discharger;
d) then the time shall be measured from the start of discharge to the point at which the voltage between the capacitor terminals becomes U1 and U2,
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Measuring method 1B (class 3, 4 and 5)
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5.5.3.3
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Unless otherwise specified in the detail specification, the measuring conditions shall be as shown in Table 2. The constant charging current (Icc) shall be able to charge the capacitor with 95 % charging efficiency and is set using the rated voltage (UR) and the nominal internal resistance (RN) by Icc (= UR /38 RN). The constant discharge current (Id) shall be able to discharge the capacitor with 95 % discharging efficiency and is set using the rated voltage (UR) and the nominal internal resistance (Rn) by Id (= UR /40Rn).
The measuring procedure shall be as follows:
a) the capacitor shall be charged with the constant charging current;
b) when the output voltage of the power supply reaches the specified value, the charging of the capacitor shall be continued with the constant voltage;
c) then the capacitor shall be discharged through the constant current discharger;
d) then the time shall be measured from the start of discharge to the point at which the voltage between the capacitor terminals becomes U1 and U2,
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Measurement method 2 for capacitance and internal resistance
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5.6
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Constant resistance charging method for capacitance measurement
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5.6.1
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The measuring procedure shall be as follows:
a) prior to measurement, short-circuit between capacitor terminals for 30 min or more to ensure discharge sufficiently;
b) set the value of R in such a way that the time constant τ settles at 60 s to 120 s;
c) measure the time constant τ when d.c. voltage UR is applied, and calculate the capacitance value by the following formula:
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AC internal resistance measuring method
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5.6.2
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The measuring procedure shall be as follows:
a) the measuring frequency shall be 1 kHz;
b) the a.c. current shall be from 1 mA to 10 mA;
c) the internal resistance Ra of a capacitor shall be calculated by the following
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Leakage current
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5.7
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The measuring procedure shall be as follows.
a) Before this measurement is carried out, the capacitors shall be fully discharged. The discharge procedure shall take 1 h to 24 h and shall be specified in the detail specification.
b) The leakage current shall be measured, unless otherwise prescribed in the detail specification, using the direct voltage (UR) appropriate to the test temperature. The electrification period after maximum 30 min charge-up time to reach 95 % of the applied
voltage shall be selected from 30 min, 1 h, 2 h, 4 h, 8 h, 12 h, 24 h or 48 h and shall be specified in the detail specification.
c) A steady source of power such as a regulated power supply shall be used.
d) Unless otherwise specified in the detail specification, apply the voltage to a capacitor through a protective resistor of 1 000 Ω or less.
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Maintain voltage
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5.8
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The measuring method shall be as follows (see Figure 5).
a) Before this measurement is carried out, the capacitors shall be fully discharged. The discharge procedure shall take 1 h to 24 h and shall be specified in the detail specification.
b) Apply the rated voltage UR directly to the capacitor terminals, without using a protective resistor. Unless otherwise specified by the detail specifications, the charging time shall be 8 h, including maximum 30 min charge-up time to reach 95 % of the applied voltage.
c) Disconnect the capacitor terminals from the voltage source. Unless otherwise specified in the detail specification, the capacitor shall be kept under standard conditions for 16 h, 24 h, 48 h or 96 h.
d) The internal resistance of the d.c. voltmeter used shall be 1 MΩ or higher.
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Robustness of terminations
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5.9
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Test Ua1 – Tensile
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5.9.1
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Test Ub – Bending (half of the sample)
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5.9.2
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Test Uc – Torsion (remaining sample)
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5.9.3
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Test Ud – Torque (for terminations with threaded studs or screws and for
integral mounting devices)
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5.9.4
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Resistance to soldering heat
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5.10
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Solderability
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5.11
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Capacitors with leads
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5.11.3
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Surface mount capacitors
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5.11.4
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Rapid change of temperature
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5.12
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The capacitors shall be subjected to Test Na of IEC 60068-2-14, using the degree of severity as prescribed in the detail specification.
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Vibration
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5.13
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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 detail specification.
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 contact, or open- or short-circuit.
The duration of the measurement shall be the time needed for one sweep of the frequency range from one frequency extreme to the other.
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Damp heat, steady state
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5.14
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The capacitors shall be subjected to Test Cab of IEC 60068-2-78, using the degree of severity corresponding to the detail specification.
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Endurance
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5.15
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IEC 60068-2-2:2007, Test Bb, shall be applied with the following exceptions:
– capacitors may be inserted in the test chamber at any temperature between room ambient temperature and the specified test temperature;
– a specified voltage shall be applied to the capacitor during the test, but the voltage shall not be applied to the capacitor before it has reached the chamber temperature.
The capacitors shall be placed in the test chamber in such way that no capacitor is located within 5 mm from any other capacitor.
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Storage
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5.16
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Storage at high temperature
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5.16.1
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The capacitors shall be subjected to IEC 60068-2-2:2007, Test Bb, using the following severities:
– test temperature : upper category temperature;
– test duration : 96 h ± 4 h.
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Storage at low temperature
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5.16.2
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The capacitors shall be subjected to IEC 60068-2-1:2007, Test Ab. 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.
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Characteristics at high and low temperature
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5.17
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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 detail specification.
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Dry heat
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5.17.3
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The capacitors shall be subjected to IEC 60068-2-2:2007, Test Bb, for 16 h, using the degree of severity of the upper category temperature, as prescribed in the detail specification.
While still at the specified high temperature and at the end of the period of high temperature, the measurements prescribed in the detail specification shall be made.
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Cold
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5.17.4
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The capacitors shall be subjected to IEC 60068-2-1:2007, Test Ab, for 2 h, using the degree of severity of the lower category temperature, as prescribed in the detail specification.
While still at specified low temperature and at the end of the period of low temperature, the measurements prescribed in the detail specification shall be made.
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Component solvent resistance
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5.18
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Solvent resistance of marking
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5.19
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Passive flammability
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5.20
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Pressure relief (if applicable)
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5.21
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Unless otherwise specified in the detail specification, d.c. voltage of an amplitude necessary to produce a current of 10 mA/F or more shall be applied to the capacitor in the forward direction.
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