3B Scientific Displacement Sensor User Manual
3B SCIENTIFIC® PHYSICS
Displacement Sensor
1000568 / U11371
Instruction sheet
04/12 Hh
1. Description
Displacement sensor inside a 3B NETlogTM sensor box
and featuring a built-in precision potentiometer plus
a rotating pulley onto which a string can be wound in
order to measure displacement. Suitable for recording
periodic and oscillatory movements which can be
traced by the turning of the string on the pulley without putting too much strain on the precision potentiometer when it reaches the limits of rotation.
The displacement sensor is detected automatically
by the 3B NETlog
• Set up the experiment with the displacement
sensor included.
• If possible, select a zero point in such a way that
the limits of rotation of the pulley are never
reached.
• Turn on the 3B NETlog
displacement sensor to one of the analog inputs,
A or B, on the 3B NETlog
TM
unit.
2. Operation
TM
unit and connect the
TM
unit.
• Wait for the unit to automatically detect the
sensor (it will then display "S / U", meaning "displacement per volt").
3. Technical data
Internal diameter
of pulley: 22 mm
Max. displacement: 61 mm
Resolution: 0.3 mm
Sensor: Precision potenti-
ometer using a wire
Max. angle of rotation
for sensor pulley: 320°
Resistance range: 10 kΩ/44 mm
Max. permitted speed of
rotation for long-term use: 1 turn/second
Max. permitted torque
at end limits 100 Ncm
1
4. Apparatus supplied
1 Displacement sensor
1 Stand rod with thread, 120 mm
1 8-pin miniDIN cable, 1 m
1 Nylon thread, 1 m, 1 mm diam.
1 Instruction manual
5. Example experiment
Recording a pV diagram for a G-model Stirling
motor using 3B NETlog
TM
and 3B NETlab
TM
Required equipment:
1 Stirling Engine G 1002594 / U10050
1 3B NETlog
or
1 3B NETlog
1 3B NETlab
TM
(115 V) 1000539 / U11300-115
TM
(230 V) 1000540 / U11300-230
TM
1000544 / U11310
1 Displacement Sensor 1000568 / U11371
1 Relative Pressure Sensor
±1000 hPa 1000548 / U11323
1 Sensor Holder for
Stirling Engine G 1008500 / U11372
1 DC Power Supply
0 – 20 V, 0 – 5 A (115 V) 1003311 / U33020
or
1 DC Power Supply
0 – 20 V, 0 – 5 A (230 V) 1003312 / U33020
Experiment leads 1002843 / U138021
• Set up the experiment as in Fig. 1.
• Wrap the thread around the displacement sen-
sor’s pulley as in Fig. 2.
• Turn on the 3B NETlog
TM
unit and wait for it to
automatically detect the sensor box.
• Connect the Stirling engine’s DC motor to the DC
power supply and set an output voltage of 6 V so
that the Stirling engine operates at medium
speed.
• Open the 3B NETlog
• Only allow the Stirling motor to operate at high-
TM
template "Stirling engine G".
speed for short periods so as not to overstress
the displacement sensor.
6. Disposal
• The packaging should be disposed of at local
recycling points.
• Should you need to dispose of the equipment
itself, never throw it away in normal domestic
waste. Local regulations for the disposal of electrical equipment will apply.
Fig. 1 Experiment set-up for recording the pV diagram of a G-model Stirling engine
2
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