3B SCIENTIFIC PHYSICS 1002956 Mode d'emploi - Page 5
Parcourez en ligne ou téléchargez le pdf Mode d'emploi pour {nom_de_la_catégorie} 3B SCIENTIFIC PHYSICS 1002956. 3B SCIENTIFIC PHYSICS 1002956 5 pages. Torsion pendulum according to prof. pohl
Imprimer la page• After measuring the period T the natural frequency
of the system ω
can be obtained from
0
ω
= 2 π/T = 3.3069 Hz
0
• The most extreme deflection arises at a motor volt-
age of 7.6 V, i.e. the resonance case occurs.
• Then the same experiment is performed with an
eddy current brake connected at currents of
Ι = 0.2 A, 0.4 A and 0.6 A.
Ι Ι Ι Ι Ι = 0.2 A
Motor voltage V
3.0
4.0
5.0
6.0
7.0
7.6
8.0
9.0
10.0
Ι Ι Ι Ι Ι = 0.4 A
Motor voltage V
3.0
4.0
A
[skt]
20
15
10
5
1
0
Resonance curves
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com • Technical amendments may occur
ϕ
0.9
1.1
1.2
1.7
2.9
15.2
4.3
1.8
1.1
ϕ
0.9
1.1
3
5
1
2
4
5.0
6.0
7.0
7.6
8.0
9.0
10.0
Ι Ι Ι Ι Ι = 0.6 A
Motor voltage V
3.0
4.0
5.0
6.0
7.0
7.6.0
8.0
9.0
10.0
• From these measurements the resonance curves can
be plotted in a graph depicting the amplitudes
against the motor voltage.
• The resonant frequency can be determined by find-
ing the half-width value from the graph.
I=0,0A
I=0,2A
I=0,4A
I=0,6A
6
7
8
9
10
10
1.3
1.8
3.6
7.4
3.6
1.6
1.0
ϕ
0.9
1.1
1.2
1.6
2.8
3.6
2.6
1.3
1.0
u[v]