3B SCIENTIFIC 1009934 Manuale di istruzioni - Pagina 2

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2. Description

The Hall effect basic apparatus provides contacts

and power supply for the circuit boards with a ger-

manium

crystal

(1008522,

1009760), also holding them in place in experi-

ments measuring the Hall effect and how it de-

pends on temperature, magnetic field or sample

current, as well as experiments on electrical con-

ductivity.

The apparatus contains an adjustable constant

current source for the sample current, a measure-

ment amplifier with offset compensation for the

Hall voltage and adjustable heating for samples.

The heating automatically cuts out at 170°C to pro-

tect fragile germanium crystals. Hall voltage, sam-

ple current, sample voltage and temperature can

all be read off from the display, which can be

switched between these various modes. In addi-

tion, Hall voltage and sample voltage can be

tapped directly via contacts on the front, and three

voltage equivalents for Hall voltage or sample volt-

age, sample current and sample temperature on

the side. On the right-hand side of the case there

are three mini-DIN sockets for computer-based

measurement of the quantities mentioned above.

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

1 Instruction manual

4.1 Decoupled measurement outputs for

1009810

and

Fig.1: Measurement outputs using 4-mm sockets and 8-

pin mini-DIN sockets

a/e

b/f

c/g

*only if U

the Hall voltage

4.2 Measurement outputs for direct measure-

Fig. 2: Measurement outputs for direct measurement

h1, h2 Sample voltage

i1, i2



4.3 Buttons for switching display and corre-

Fig. 3: Buttons for switching display

4. Controls

measuring voltage equivalents for quan-

tities

Hall voltage/sample voltage*

Sample current

Sample temperature

Earth socket

is being displayed, otherwise it outputs

ment

Hall voltage

Caution: do not any apply an external voltage

to the measurement outputs!

sponding LEDs

Hall voltage or sample voltage (Hold down

for 2 s to display sample voltage)

Sample current

Sample temperature