550D

Vishay Sprague

for High Frequency Power Supplies

www.vishay.com

For technical questions, contact: aluminumcaps4@vishay.com

Document Number: 40017

7

Revision: 28-Aug-08

PERFORMANCE CHARACTERISTICS (Continued)

12.1.1 Test equipment shall be adjusted to produce a shock

of 100 g peak with a duration of 6 ms and a sawtooth

waveform at a velocity change of 9.7 ft./s.

12.2

Capacitors shall be subjected to 3 shocks applied in

each of 3 directions corresponding to the 3 mutually

perpendicular axes of the capacitors.

12.3

Rated DC voltage shall be applied to capacitors

during test.

12.3.1 A cathode ray oscilloscope or other comparable

means shall be used in determining electrical

intermittency during test. The AC voltage applied

12.4

Electrical tests shall show no evidence of intermittent

contacts, open circuits or short circuits during these

tests.

12.5

There shall be no mechanical damage to these

capacitors as a result of these tests.

12.6

Following the shock test, capacitors shall meet the

original limits for capacitance, dissipation factor and

leakage current.

13.

Moisture Resistance:

13.1

Capacitors

shall

be

subjected

to

temperature

cycling at 90 % to 98 % relative humidity, in a test

chamber

constructed

of

non-reactive

materials

(non-resiniferous and containing no formaldehyde or

phenol).

Steam

or

distilled,

demineralized

or

deionized water having a pH value between 6.0 and

7.2 at + 23 °C shall be used to obtain the required

humidity. No rust, corrosive contaminants or dripping

condensate shall be imposed on test specimens.

13.1.1 Capacitors shall be mounted by their normal

mounting means in a normal mounting position and

placed in a test chamber so that uniform and thorough

exposure is obtained.

13.1.2 No conditioning or initial measurements will be

performed prior to temperature cycling. Polarization

and load voltages are not applicable.

13.1.3 Capacitors shall be subjected to temperature cycling

from + 25 °C to + 65 °C to + 25 °C (+ 10 °C, - 2 °C)

over a period of 8 h, at 90 % to 98 % relative humidity,

for 20 cycles.

13.1.4 Temperature cycling shall be stopped after an even

number of cycles 5 times during the first 18 cycles,

and the capacitor shall be alloweed to stabilize at high

humidity for 1 to 4 h.

13.1.5 After stabilization, capacitors shall be removed from

the humidity chamber and shall be conditioned for 3 h

at - 10 °C ± 2 °C.

13.1.6 After cold conditioning, capacitors shall be subjected

to vibration cycling consisting of a simple harmonic

vibration having an amplitude of 0.03" (0.76) and a

maximum total excursion of 0.06" (1.52) varied

uniformly from 10 Hz to 55 Hz to 10 Hz over a period

of 1 min, for 15 cycles.

13.1.7 Capacitors shall then be returned to temperature/

humidity cycling.

13.2

After completion of temperature cycling, capacitors

shall be removed from the test chamber and

stabilized at room temperature for 2 to 6 h.

13.3

Capacitors shall show no evidence of harmful or

extensive corrosion, obliteration or marking or other

visible damage.

13.4

Following the moisture resistance test, capacitors

shall meet the original limits for capacitance,

dissipation factor and leakage current.

14.

Insulating Sleeves:

14.1

Capacitors with insulating sleeves shall withstand a

case and a metal “V” block in intimate contact with the

insulating sleeve.

14.2

Capacitors with insulating sleeves shall have the

insulation resistance measured between the case

and a metal “V” block in intimate contact with the

insulating sleeve. The insulation resistance shall be

at least 1000 M

Ω

15.

Thermal Shock And Immersion Cycling:

15.1

Capacitors shall be conditioned prior to temperature

cycling for 15 min at + 25 °C, at less than 50 %

relative humidity and a barometric pressure at 28 to

31".

15.2

Capacitors shall be subjected to thermal shock in a

cycle of exposure to ambient air at

- 65 °C (+ 0 °C, - 5 °C) for 30 min, then,

+ 25 °C (+ 10 °C, - 5 °C) for 5 min, then

+ 125 °C (+ 3 °C, - 0 °C) for 30 min, then

+ 25 °C (+ 10 °C, - 5 °C) for 5 min, for 5 cycles.

15.3

Between 4 and 24 h after temperature cycling,

capacitors shall be subjected to immersion in a bath

of fresh tap water with the non-corrosive dye

Rhodamine B added, at + 65 °C (+ 5 °C, - 0 °C) for

15 min, then, within 3 s, immersed in a saturated

solution

of

sodium

chloride

and

water

with

Rhodamine B added, at a temperature of + 25 °C

(+ 10 °C, - 5 °C) for 15 min, for 2 cycles.

15.3.1 Capacitors shall be thoroughly rinsed and wiped or

air-blasted dry immediately upon removal from

immersion cycling.

15.4

Capacitors shall show no evidence of harmful or

extensive corrosion, obliteration of marking or other

visible damage.