3B SCIENTIFIC PHYSICS 1002956 Operating Instructions

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3B SCIENTIFIC

3B SCIENTIFIC® PHYSICS

Torsion Pendulum According to Prof. Pohl 1002956

Operating instructions

06/18 ALF

The torsion pendulum may be used to investigate free,

forced and chaotic oscillations with various degrees of

damping.

Experiment topics:

• Free rotary oscillations at various degrees of damp-

ing (oscillations with light damping, aperiodic os-

cillation and aperiodic limit)

• Forced rotary oscillations and their resonance

curves at various degrees of damping

• Phase displacement between the exciter and reso-

nator during resonance

• Chaotic rotary oscillations

• Static determination of the direction variable D

• Dynamic determination of the moment of inertia J

1. Safety instructions

• When removing the torsional pendulum from the

packaging do not touch the scale ring. This could

PHYSICS

Exciter motor

Control knob for fine adjustment of the exciter voltage

Control knob for coarse adjustment of the exciter voltage

Scale ring

Pendulum body

Coil spring

Pointer for the exciter phase angle

Pointer for the pendulum's phase angle

Pointer for the pendulum's deflection

Exciter

Eddy current brake

Guide slot and screw to set the exciter amplitude

Connecting rod

Eccentric drive wheel

4-mm safety socket for exciter voltage measurement

4-mm safety sockets for the exciter motor power supply

4-mm safety sockets for the eddy current brake power

supply

lead to damage. Always remove using the handles

provided in the internal packaging.

• When carrying the torsional pendulum always hold

it by the base plate.

• Never exceed the maximum permissible supply

voltage for the exciter motor (24 V DC).

• Do not subject the torsional pendulum to any un-

necessary mechanical stress.

2. Description, technical data

The Professor Pohl torsional pendulum consists of a

wooden base plate with an oscillating system and an

electric motor mounted on top. The oscillating system

is a ball-bearing mounted copper wheel (5), which is

connected to the exciter rod via a coil spring (6) that

provides the restoring torque. A DC motor with coarse

and fine speed adjustment is used to excite the tor-

sional pendulum. Excitement is brought about via an

eccentric wheel (14) with connecting rod (13) which