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Vishay BCcomponents

Revision: 04-Oct-2021

4

Document Number: 28362

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MEASURING OF CHARACTERISTICS

CAPACITANCE (C)

Capacitance shall be measured by constant current

discharge method.

Fig. 3 - Voltage diagram for capacitance measurement

Capacitance value CR is given by discharge current ID, time

T and rated voltage UR, according to the following equation:

Fig. 4 - Test circuit for capacitance measurement

INTERNAL RESISTANCE (RI) AT 1 kHz

Fig. 5 - Test circuit for RI measurement

LEAKAGE CURRENT (IL)

Leakage current shall be measured after 30 min application

of rated voltage UR:

Fig. 6 - Test circuit for leakage current

Fig. 7 - Typical leakage current as a function of time

DISCHARGE CURRENT AS A FUNCTION OF

RATED CAPACITANCE

PARAMETER

VALUE

UNIT

Rated

capacitance, CR

0.047 0.1 0.22 0.33 0.47 0.68 1.0

F

Discharge

current, ID

0.1

1.0

mA

30 min

T (s)

Time

0

2.0

U

R

U

(V)

CF

()

I

D mA

() x 10-3 x T s

()

U

R V

() - 2

---------------------------------------------------------

=

A

V

C

Constant

current

discharger

+

R

I Ω

()

V

C V

()

10

-3

----------------

=

V

A

1 mA

C

1 kHz

+

I

L μA

()

VV

()

10

-4

------------

=

V

R

S

100

Ω

C

+

+

1

10

2

10

Time (h)

2

4

5

1

1

10

20

30

40

50

I

L

(µA)

Curve 1: 1.0 F, 5.5 V

Curve 2: 0.47 F, 5.5 V

Curve 3: 0.22 F, 5.5 V

Curve 4: 0.1 F, 5.5 V

Curve 5: 0.047 F, 5.5 V

R

S = 100 Ω

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