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3. Technical data
Number of windings:
Diameter of wire
Internal resistance:
Inductance without core:
Current consumption:
Dimensions:
Total weight:
Iron samples:
Material:
4. Operation
In order to record hysteresis curves, the following
equipment is additionally required:
1 Magnetic Field Sensor, Axial/Tangential
1 Teslameter E
2 HF Patch Cord, BNC/4 mm Plug
Safety Experiment Leads
A. Dynamic measurement:
1 Digital Oscilloscope, 2x30 MHz
1 Function Generator FG 100 @230 V 1009957
or
1 Function Generator FG100 @115 V 1009956
1 Digital Multimeter E
B. Static measurement
1 DC Power Supply 20 V, 5 A @230 V
or
1 DC Power Supply 20 V, 5 A @115 V
4.1 Recording of hysteresis curve with an os-
cilloscope (dynamic measurement)
Connect up the function generator, coil, am-
meter, teslameter and oscilloscope as shown
in Fig. 1.
Insert the core into the coil.
Attach the field sensor into the holder in such
a way that the tangential sensor is next to the
middle of the iron sample. The iron probe
must always be adjacent to the tangential
sensor, otherwise the results of the measure-
ment will be skewed.
Turn on the function generator and set the
frequency to anything between 30 and 50 Hz.
Slowly increase the coil current using the
100x amplitude knob on the function genera-
tor until the magnetic field density B reaches
850
0.65 mm
3.2 Ω
3.2 mH
max. 1.5 A DC
200 x 145 x 60 mm
470 g approx.
140 mm x 10 mm
diam. approx.
Silver steel, spring
steel, Vacon 11
1001040
1008537
1002748
1020910
1018832
1003312
1003311
saturation. The coil current must not exceed
its maximum of 1.5 A.
Observe the results on the oscilloscope
screen.
Repeat the experiment with different samples
of iron.
4.2 Manual recording of hysteresis curve
(static measurement)
Connect up the power supply, coil and tes-
lameter as shown in Fig. 2.
Insert the core into the coil.
Attach the field sensor into the holder in such
a way that the tangential sensor is next to the
middle of the iron sample. The iron probe
must always be adjacent to the tangential
sensor, otherwise the results of the measure-
ment will be skewed.
Turn on the power supply and set it to 0 V.
Calibrate the teslameter to 0 (by reversing
the polarity of the supply voltage as neces-
sary and not by using the offset knob).
Increase the coil current in suitable steps up
to a maximum of 1.5 A and afterwards turn it
back down to 0 amps. Write down the current
and the corresponding magnetic flux density
at each step. Change the polarity of the
power supply and do the experiment again.
Note: the magnetic flux density remains non-
zero after the coil current has been turned
back down.
Work out the magnetic field strength H from
the current in the coil I, the number of wind-
ings n and the length of the coil s.
H = n*I/s
Plot how the magnetic flux density depends
on the magnetic field strength on a graph.
Repeat the experiment with different samples
of iron.
5. Storage, cleaning and disposal
Keep the equipment in a clean, dry and dust-
free place.
Before cleaning the equipment, disconnect it
from its power supply.
Do not clean the unit with volatile solvents or
abrasive cleaners.
Use a soft, damp cloth to clean it.
The packaging should be disposed of at local
recycling points.
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