3B Scientific Magnetic Field Sensor ±2000 mT - Manual (Page 2)

2
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:
( ) ( )
⎥
⎦
⎤
⎢
⎣
⎡
⎟
⎠
⎞
⎜
⎝
⎛ −
⋅ − ⋅ =
300 00088 0 1 300
K
T
, K B T B
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 sub-
ject 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 sur-
face on the sensor will then be within the
uniform magnetic field of the electro-
magnet and right next to the semiconduc-
tor crystal.
• Read off the value of the magnetic flux
density from the 3B NETlog TM display.
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 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 auto-
matically.
The zero display follows on the 3B NETlog TM
display row corresponding to the selected sen-
sor 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 den-
sity involving the Hall effect in semiconduc-
tors
Equipment needed:
1 3B NETlog
TM (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.