3B Scientific Magnetic Field Sensor User Manual

3B SCIENTIFIC

Magnetic Field Sensor ±2000 mT 1009941

Instruction Sheet

04/12 Hh

®

PHYSICS

1. Description

Sensor box with attached sensor probe, 140
mm long, 7 mm wide and 1.9 mm thick, for

measuring magnetic flux density B of a mag-

netic field acting outside the box in a tangential
plane, primarily for use with the basic Hall­effect apparatus (1009934).

At the tip of the probe there is a Hall sensor
with an active area of about 0.044 mm², which
produces a steady output signal that is rati­ometric (i.e., proportional to the operating volt­age).

The Hall sensor has an extended temperature
range of -20°C to +180°C for measuring the flux
density of heated germanium semiconductor
crystals (probes).

There are two latching range buttons for 0.2 T
and 2 T plus an additional Tare button for cali­bration. The current setting of the measure­ment range is shown visually by a light-emitting
diode on the left of the relevant button.

The stand clamping rod can be adjusted to
hold the sensor in the desired position and

orientation in the magnetic field that is being
measured.

The box is also suitable for use with the connec­tor box (115 V, 50/60 Hz) (1009954) or connector
box (230 V, 50/60 Hz) (1009955). See the rele­vant technical data.

2. Safety instructions

The magnetic field sensor is not suitable for
applications where safety is essential.

• Only use the magnetic field sensor for

educational purposes!

3. Equipment supplied

1 sensor box with permanently attached probe
1 miniDIN 8-pin connecting cable, 60 cm
1 clamping rod, length 120 mm
1 instruction sheet

1

4. Technical data

Measurement ranges: 200 mT, 2000 T
Configuration: Tangential
Sensor type: Linear Hall-effect

sensor

Position of Hall sensor: 135 mm, with refer-

ence to the front of the
sensor box casing

Tare range:
200 mT range: +/- 100 mT
2 T range: +/- 1 T

Non-linearity: Max. ±1,5 % of the

total measurement
range

Temperature dependence:

() ( )

⎡

,KBTB

⎢
⎣

T

⎛
⎜

K

⎝

⎤

⎞

−⋅−⋅= 3000008801300

⎟

⎥

⎠

⎦

When used with a connector box
200 mT range: Conversion factor:

125 mT/V, 1.60 V at
200 mT

2 T range: Conversion factor:

1250 mT/V, 1.60 V at
2000 mT

5. Operation

Note:

• To avoid permanent damage to the Hall

sensor in the sensor probe tip, do not sub­ject it to any mechanical pressure!

• Do not bend the sensor probe tip!

• Hold the sensor box by hand in the mag-

netic field to be measured, or use the
clamping rod to position it as required in
the experimental setup.

• Set the tangential orientation of the sensor

element as required and measure the
magnetic field.

• Insert the sensor probe vertically through

the positioning hole marked "MFS" on the
top of the basic Hall-effect apparatus till it
comes to rest. The centre of the active sur­face on the sensor will then be within the
uniform magnetic field of the electro­magnet and right next to the semiconduc­tor crystal.

• Read off the value of the magnetic flux

density from the 3B NETlog

The sensor box is automatically detected by

the 3B NETlog

TM

unit.

Any change in the measuring range is auto-

matically transmitted to the 3B NETlog

TM

display.

TM

unit.

5.1 Zero calibration for the sensor box

• When a measuring range has been se-

lected, hold down the Tare button for about
1 s. Zero calibration is carried out auto­matically.

The zero display follows on the 3B NETlog

TM

display row corresponding to the selected sen­sor input.

• Under certain circumstances it may be

necessary to carry out zero calibration
again between measurements.

• Zero calibration should not be carried out

inside the pole pieces of a transformer.
The poles may possess some remanence
which would need to be taken into account.

6. Experimental applications

Magnetic fields of permanent magnets and
coils
Hysteresis of transformers
Remanence
Saturation effects in ferrite cores

7. Sample experiment

Experiment to measure magnetic flux den­sity involving the Hall effect in semiconduc­tors

Equipment needed:

TM

1 3B NETlog

(115 V, 50/60 Hz) 1000539

1 Transformer with Rectifier (115 V, 50/60 Hz)

1003315

1 DC Power Supply 20 V, 5 A (115 V, 50/60 Hz)

1003311

or

1 3B NETlog

TM

(230 V, 50/60 Hz) 1000540

1 Transformer with Rectifier (230 V, 50/60 Hz)

1003316

1 DC Power Supply 20 V, 5 A (230 V, 50/60 Hz)

1003312
1 Hall Effect Basic Apparatus 1009934
1 P-Doped Ge on Circuit Board 1009810

or
1 N-Doped Ge. on Circuit Board 1009760

1 Magnetic Field Sensor ±2000 mT 1009941
1 U Core 1000979
2 Coils D with 600 Taps 1000988
1 Pair of Pole Shoes 1009935
1 Set of 15 Safety Experiment Leads 1002843

• Set up the experiment as in Fig. 1.

• Switch the transformer and rectifier to the

12-V setting to supply the basic Hall-effect
apparatus with 12 V AC.

2