3B SCIENTIFIC PHYSICS 1003313 Bedienungsanleitung Seite 6

2.1 Operating controls and connections
1 Connecting socket for magnetic field probe
2 Digital display
3 Measurement range selector, 20 mT
4 Measurement range selector, 200 mT
5 Measurement mode switch, axial (B
6 Zero adjustment knob for B
7 Zero adjustment knob for B
8 Output socket for axial mode B
9 Earth (ground) socket
10 Output socket for tangential mode B
11 On/off switch
Magnetic field probe: 1 axial Hall probe (x-direction), 2
tangential Hall probe (z-direction), 3 probe carrier
3. Technical data
Measurement range 20 mT
Resolution:
Accuracy:
Measurement range 200 mT
Resolution:
Accuracy:
Digital display:
Height of digits:
Input:
Output:
Output voltage:
Dimensions of unit:
Dimensions of probe:
4. Operation
) and tangential (B
X
with LED indicator
X
with LED indicator
Z
X
Z
0.01 mT
2 % ±3 digits
0.1 mT
2 % ±1 digits
3½ digit LCD with sign
showing field direction
13 mm
BNC socket
4 mm safety sockets
10 mV / mT (20 mT)
1 mV / mT (200 mT)
205 x 230 x 85 mm³
360 x 15 x 25 mm³
4.1 Zero adjustment
It is recommended that the zero adjustment should
be carried out with the measurement range set to 20
mT. If the range is subsequently changed to the larger
one, it is not necessary to repeat the adjustment.
If the magnetic field of a permanent magnet is to be
measured, the zero adjustment must be carried out at
a sufficiently large distance from the magnet.
If the fields of current-carrying conductors are to be
measured, it is recommended to first switch off the
magnetic field current and position the probe at the
point where the measurement is to be made.
•
Connect the magnetic field probe to the probe socket 1.
•
Select the 20 mT measurement range.
•
Rotate the zero adjustment knob until the
)
indicated field value is zero or as small as possible.
Z
4.2 Measurement of axial magnetic fields
The axial Hall probe measures the component of the
magnetic flux density along the direction of the probe axis.
It is also possible to determine the direction of the
magnetic field: if the field lines are directed towards the
probe carrier (e.g., like the field coming from the north
pole of a bar magnet), the indicated value is positive,
whereas for the opposite direction it is negative.
4.3 Measurement of tangential magnetic fields
The tangential Hall probe measures the component of
the magnetic
perpendicular to the carrier plate.
It is also possible to determine the direction of the
magnetic field: a positive reading indicates that the
field entering the tangential probe comes from the
direction of the carrier surface with the scale
markings, whereas a negative reading indicates that it
is in the opposite direction.
4.4 Using the analogue output signals
The output sockets (8, 9, 10) provide voltages
proportional to the magnetic field components that
can be fed to external measuring devices (data
loggers, XY graph plotters, or analogue multimeters).
The output voltage corresponds to the digital reading.
It amounts to 10 mV per mT field value in the 20 mT
operating range and 1 mV per mT field value in the
200 mT operating range.
2
flux density in the direction