3B SCIENTIFIC Hall Effect Basic Apparatus Buku Petunjuk - Halaman 4

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Fig. 6 Console inserted onto U-shaped holder

Fig. 7 Set-up with magnetic field sensor, side view

Fig.8 Set-up with magnetic field sensor, front view

7. Experiments

7.1 Measurement of Hall voltage as a func-

tion of magnetic flux density B, tempera-

ture T or sample current I for n- or p-

doped germanium

The following equipment is needed for the ex-

periments:

1 Transformer with rectifier, 3 A @230 V 1003316

1 Transformer with rectifier, 3 A @115 V 1003315

1 DC power supply, 20 V, 5 A @230 V 1003312

1 DC power supply, 20 V, 5 A @115 V 1003311

1 3B NETlog™ unit @230 V

1 3B NETlog™ unit @115 V

1 Set of 15 safety experiment leads



Complete the experiment set-up as shown in

Fig. 9.



Connect the AC output of the transformer to

the input sockets for the power supply and

set an output voltage of 12 V.



Connect the coils to the DC power supply.



Connect the magnetic field sensor to the 3B

NETlog™ unit.



Select sample current I

current see instruction manual for germani-

um crystal), select the Hall voltage on the

console and adjust the zero point for the Hall

voltage with the help of the compensation

trimmer.

7.1.1 Hall voltage as a function of sample current I



Turn on the DC power supply and set it up

as a constant current source



Select magnetic flux density B or coil current

and record the Hall voltage U

of the sample current I



For your measurement plots, see the manu-

al for the relevant circuit boards.

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 chang-

ing the current through the coils and record

the corresponding Hall voltage U



For your measurement plots, see the manu-

al for the relevant circuit boards.

1000540

1000539

1002843

(for max. sample

as a function