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a) Bestimmung der Induktivitat
1
L, = ————;
0 = 2x-f
W7res * CN
Zahlenbeispiel: Ck = 30 pF, CN = 0,1 uF, f = 4kHz, Lx = ?
Ermittelter Wert: 16 mH
Die genaue Rechnung ergibt:
1
1
lL.
=
—_
=
(2 nf)? - Cn
4n216-10°Hz:1°107F
108
108
L, = ————_(H)_
= ———
= 15,85 mH
4x2 +16
39,4 + 16
b) Bestimmung der SpulengréBe
a) Determining inductivity
By a variation of the frequency f from an RC generator the
point of resonance
is determined
when Vres shown
by the
millivoltmeter
is a maximum.
The
inductivity
is then
ap-
proximately:
1
L, = —\———_ ; 0 = 2an-f
W7res * CN
Example: Cx = 30 pF, Cn = 0.1 uF, f = 4kHz, Ly = ?
For an approximation and to determine the L-value it is re-
commended to use an RF Nomogram to show the relationship
between C, L and R.
Value obtained from nomogram: 16 mH,
A more exact calculation:
1
1
11
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