www.vishay.com

51

CWR11

Vishay Sprague

Document Number 40011

Revision 31-Jan-05

For technical questions, contact tantalum@vishay.com

change shall not exceed ± 10%; the leakage

current shall not exceed 125% of the initial

requirement.

9.

Vibration Tests: Capacitors shall be subjected to

vibration tests in accordance with the following

criteria.

9.1

Capacitors shall be secured for test by means of a

rigid mounting using suitable brackets.

9.2

Low Frequency Vibration: Vibration shall consist

of simple harmonic motion having an amplitude of

0.03" [0.76mm] and a maximum total excursion of

0.06" [1.52mm], in a direction perpendicular to the

major axis of he capacitors.

9.2.1 Vibration frequency shall be varied uniformly

between the approximate limits of 10 Hz to 55 Hz

during a period of approximately one minute,

continuously for 1.5 hours.

9.2.2 An oscilloscope or other comparable means shall

be used in determining electrical intermittency

during the final 30 minutes of the test. The AC

voltage applied shall not exceed 2 volts rms.

9.2.3 Electrical tests shall show no evidence of

intermittent contacts, open circuits or short circuits

during these tests.

9.2.4 Following the low frequency vibration test,

capacitors shall meet the original requirements for

capacitance, dissipation factor and leakage current.

9.3

High Frequency Vibration: Vibration shall

consist of a simple harmonic motion having an

amplitude of 0.06" [1.52] ± 10% maximum total

excursion or 20 g peak whichever is less.

9.3.1 Vibration frequency shall be varied logarithmically

from 50 Hz to 2000 Hz and return to 50 Hz during

a cycle period of 20 minutes.

9.3.2 The vibration shall be applied for 4 hours in each

of 2 directions, parallel and perpendicular to the

major axis of the capacitors.

9.3.3 Rated DC voltage shall be applied during the

vibration cycling.

9.3.4 An oscilloscope or other comparable means shall

be used in determining electrical intermittency

during the last cycle. The AC voltage applied shall

not exceed 2 volts rms.

9.3.5 Electrical tests shall show no evidence of

intermittent contacts, open circuits or short circuits

during these tests.

9.3.6 There shall be no mechanical damage to these

capacitors as a result of these tests.

TYPICAL LEAKAGE CURRENT FACTOR RANGE

100

10

1.0

0.1

0.01

0.001

0

10

20

30

40

50

60

70

80

90

100

+ 125

+ 85

+ 55

+ 25

0

- 55

Percent of Rated Voltage

7.

Leakage Current: Capacitors shall be stabilized at

the rated temperature for 30 minutes. Rated voltage

shall be applied to capacitors for 5 minutes using a

steady source of power (such as a regulated power

supply) with a 1000 ohm resistor connected in series

with the capacitor under test to limit the charging

current. Leakage current shall then be measured.

Note that the leakage current varies with temperature and

applied voltage. See graph below for the appropriate

adjustment factor.

7.1

At + 25

value listed in the Standard Ratings Table.

7.2

At + 85

times the value listed in the Standard Ratings Table.

7.3

At + 125

times the value listed in the Standard Ratings Table.

8.

Life Test: Capacitors shall withstand rated DC

voltage applied at + 85°C or two-thirds rated voltage

applied at + 125°C for 2000 hours.

8.1

Following the life test, the dissipation factor shall

meet the initial requirement; the capacitance

PERFORMANCE CHARACTERISTICS (Continued)