3B SCIENTIFIC Hall Effect Basic Apparatus Manual de instruções - Página 2

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2. Description

The Hall effect basic apparatus provides con-

tacts and power supply for the circuit boards

with a germanium crystal (1008522, 1009810

and 1009760), also holding them in place in ex-

periments measuring the Hall effect and how it

depends on temperature, magnetic field or sam-

ple current, as well as experiments on electrical

conductivity.

The apparatus contains an adjustable constant

current source for the sample current, a meas-

urement amplifier with offset compensation for

the Hall voltage and adjustable heating for sam-

ples. The heating automatically cuts out at 170°C

to protect fragile germanium crystals. Hall volt-

age, sample current, sample voltage and tem-

perature can all be read off from the display,

which can be switched between these various

modes. In addition, Hall voltage and sample volt-

age can be tapped directly via contacts on the

front, and three voltage equivalents for Hall volt-

age or sample voltage, sample current and sam-

ple temperature on the side. On the right-hand

side of the case there are three mini-DIN sockets

for computer-based measurement of the quanti-

ties mentioned above using a 3B NETlog

The equipment is set up on the U-shaped core of

the multi-piece transformer kit. The magnetic field

can be measured using a magnetic field sensor

adjacent to the crystal.

3. Contents

1 Hall effect basic apparatus

1 U-shaped holder

2 Connector leads with 8-pin mini-DIN plugs

Instruction manual

4.1 Decoupled measurement outputs for

measuring voltage equivalents for quan-

tities

Fig.1 Measurement outputs using 4-mm sockets and

8-pin mini-DIN sockets for 3B NETlog

a/e

Hall voltage/sample voltage*

b/f

Sample current

c/g

Sample temperature

Earth socket

* only if U

puts the Hall voltage

unit.

4.2 Measurement outputs for direct meas-

urement

Fig. 2 Measurement outputs for direct measurement

h1, h2 Sample voltage

i1, i2



Caution: do not any apply an external volt-

age to the measurement outputs!

4.3 Buttons for switching display and corre-

sponding LEDs

Fig. 3 Buttons for switching display

Hall voltage or sample voltage (Hold down

for 2 s to display sample voltage)

Sample current

Sample temperature

4. Controls

is being displayed, otherwise it out-

Hall voltage