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7.8

Stray inductance

The stray inductance

both coils when a current-compensated choke is short-circuited at one end. This affects symmetri-

cal interference.

Fig. 11

Stray inductance

7.9

Inductance decrease

∆L/L

0

The inductance decrease

∆L/L

inductance

crease is caused by the magnetization of the core material, which is a function of the field strength,

as induced by the operating current. Generally the decrease is less than 10 % .

7.10

DC resistance

The dc resistance is the resistance of a line as measured using direct current at a temperature of

20

°C, whereby the measuring current must be kept well below the rated current.

typical value

minimum value

maximum value

7.11

Winding capacitance, parasitic capacitance

Parasitic capacitances (

the component geometry. These capacitances may affect the two lines mutually (symmetrically) as

well as the line-to-ground circuit (asymmetrically). The design of all EMC components supplied by

EPCOS minimizes the parasitic effects. Due to this, these components have excellent interference

suppression characteristics right up to high frequencies.

7.12

Quality factor

Q

The quality factor

Q is the quotient of the imaginary component of the impedance divided by the real

component.

7.13

Measuring frequencies

General Technical Information