Pohl Torsion Pendulum

Description
Experiments

Applications and Experiments:_..

The torsion pendulum is used to investigate free, forced, and chaotic oscillations with different damping levels. In particular, school students and college students study the following topics:

•	free torsional oscillations with different damping levels (oscillation with weak damping, heavy damping, and critical damping)
•	forced oscillations and their resonance curves with different damping levels
•	phase shift between exciter and resonator at resonance
•	chaotic rotational oscillations
•	static determination of the torsional spring constant D
•	dynamic determination of the moment of inertia J

Product Information:_..

The Pohl torsion pendulum consists of an oscillating system mounted on a wooden base plate and an electric motor. The oscillating system consists of a ball-bearing mounted copper wheel that is connected to the exciter mount via a helical spring, which provides the restoring torque.
The DC motor with coarsely and finely adjustable rotational speed is used to excite the torsion pendulum. Via an eccentric with a connecting rod, it periodically extends and compresses the helical spring, thereby setting the copper wheel into oscillation. An electromagnetic eddy current brake is used for damping. A scale ring with slots and a scale with 2 mm scale division surrounds the oscillating system. Pointers are located on the exciter and resonator.

Specifications:_..

Natural frequency:	0.5 Hz approx.
Excitation frequency:	0 – 1.3 Hz (continuously adjustable)
Motor:	24 V max. DC or AC; 0.7 A
Eddy current brake:	0 – 20 V DC; 2 A max.
Connections:	4 mm safety sockets
Dimensions:	400 mm x 140 mm x 270 mm approx.
Weight:	4 kg approx.

Scope of Delivery:_..

1	Torsion pendulum
2	Add-on masses 10 g
2	Add-on masses 20 g