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5. Operation
•
Hold the sensor box by hand in the magnetic
field to be measured, or use the clamping rod
to position it as required in the experimental
setup.
•
Set the tangential orientation of the sensor
element as required and measure the magnetic
field.
•
Read the magnetic flux density value on the
display of the 3B NETlog
The sensor box is designed to be recognised auto-
matically by the 3B NETlog
Switching between the different measurement
ranges is recognised by the 3B NETlog
into account.
5.1 Zero calibration for the sensor box
TM
(as of 3B NETlog
firmware version 3.27)
•
Hold down the 2 mT range button for slightly
longer than 2 s, then release it.
Zero calibration occurs automatically. Successful
calibration is indicated when the the LED on the
left next to the 2 mT range button flashes several
times and is followed by a bleep from the 3B NET-
TM
log
unit.
The pointer of the 3B NETlog
dated ("Refresh") and the zero pointer is indicated
on the row corresponding to the chosen sensor
input.
If necessary, the zero calibration procedure should
be repeated between successive measurements.
6. Experimental applications
Magnetic fields of permanent magnets and coils
Plotting the lines of the earth's magnetic field
7. Sample experiment
Measurement of the flux density and induced
voltage for a bar magnet moved rapidly inside a
coil
Equipment needed:
TM
1 3B NETlog
TM
1 3B NETlab
1 magnetic field sensor, tangential
1 coil D with 600 taps
1 cylindrical bar magnet 200x10
2 experiment leads, each 25 cm long, from
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany •
TM
.
TM
.
TM
and taken
TM
display is then up-
U11300
U11310
U11360
U8497430
U20550
U138101
Subject to technical amendments
© Copyright 2008 3B Scientific GmbH
•
Set up the experiment as shown in Fig. 1.
•
TM
On the 3B NETlab
(template) for the "Magnetic field sensor, tan-
gential" experiment.
•
Taking the round bar magnet in one hand,
push it into the coil.
•
TM
On the 3B NETlab
start the recording of the
experimental curve.
•
Withdraw the round bar magnet quickly from
the coil.
•
Interpret the experimental curve (Fig. 2):
When the flux density changes there is an induced
voltage.
Fig. 1 Measurement of the relationship between the
flux density (analogue input A) and the induced
voltage (analogue input B) when a bar magnet is
moved rapidly in a coil
Fig. 2 Display on the monitor screen of the 3B NETlab
(U11310) showing the relationship between the
flux density (blue curve) and the induced voltage
(red curve) for a bar magnet moved rapidly in a
coil
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TM
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