3B SCIENTIFIC 1009934 Manual de instruções - Página 5

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Fig. 9: Experiment set-up for investigating the Hall effect with a uniform magnetic field

7.1.2 Hall voltage as a function of magnetic flux

density B



Select a constant sample current, e.g. 20 mA.



Vary the magnetic flux density B by changing

the current through the coils and record the

corresponding Hall voltage U



For your measurement plots, see the manual

for the relevant circuit boards.

7.1.3 Hall voltage as a function of temperature T



Select magnetic flux density B or coil current.



Switch on the heating controller and record

the Hall voltage U

ture.



It is recommended that the sample be heated

to 170°C and to write down the Hall voltage

as it cools down.



Turn on the heating controller and record the

Hall voltage U

as a function of temperature.



For your measurement plots, see the manual

for the relevant circuit boards.

7.2 Measurement of conductivity as a func-

tion of temperature T

The following equipment is needed for the ex-

periments:

1 Transformer with Rectifier 12 V, 3 A @230 V

1 Transformer with Rectifier 12 V, 3 A @115 V



Select a small sample current I

current will cause the sample to heat up, you

should not exceed a current of 5mA.

3B Scientific GmbH ▪ Ludwig-Erhard-Straße 20 ▪ 20459 Hamburg ▪ Germany ▪ www.3bscientific.com

as a function of tempera-

1003316

1003315

. Since the

Subject to technical amendments



Switch the display to sample voltage.



Turn on the heating controller and record the

sample voltage U

ture.



For your measurement plots, see the manual

for the relevant circuit boards.

8. Care and maintenance



Before cleaning the equipment, disconnect it

from its power supply and remove the circuit

board.



Use a soft, damp cloth to clean it.



Keep the circuit board in the original box after

it has been used and has cooled down.

9. Disposal



The packaging should be disposed of at local

recycling points.



Should you need to

dispose of the equip-

ment

itself,

never

throw it away in nor-

mal domestic waste.

Local regulations for

the disposal of electri-

cal equipment will ap-

ply.

as a function of tempera-