4
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
or
1 Transformer with rectifier, 3 A @115 V 1003315
1 DC power supply, 20 V, 5 A @230 V 1003312
or
1 DC power supply, 20 V, 5 A @115 V 1003311
1 3B NET
log
™ unit @230 V 1000540
or
1 3B NET
log
™ unit @115 V 1000539
1 Set of 15 safety experiment leads
1002843
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
NET
log
™ unit.
Select sample current
I
P
(for max. sample
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
P
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
H
as a function
of the sample current
I
P
.
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
H
.
For your measurement plots, see the manu-
al for the relevant circuit boards.
Summary of Contents for Hall Effect Basic Apparatus
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