3B Scientific Digital Teslameter with Probe User Manual

3B SCIENTIFIC® PHYSICS

Teslameter, 20 mT, 200 mT (115 V, 50/60 Hz)
Teslameter, 20 mT, 200 mT (230 V, 50/60 Hz)

1003313 (115 V, 50/60 Hz)
1003314 (230 V, 50/60 Hz)

Instruction sheet

04/12 ALF

1 Teslameter
2 Magnetic field probe

1. Safety instructions

The teslameter, 20 mT, 200 mT conforms to all safety
regulations for electrical measuring, control,
monitoring and laboratory equipment, as specified
under DIN EN 61010, Section 1, and the equipment has
been designed to meet protection class II. It is intended
for operation in a dry environment, suitable for the
operation of electrical equipment and systems.

Safe operation of the equipment is guaranteed, provided it
is used correctly. However, there is no guarantee of safety if
the equipment is used in an improper or careless manner.

If it may be assumed for any reason that non­hazardous operation will not be possible (e.g. visible
damage), the equipment should be switched off
immediately and secured against any unintended use.

• Before using the power supply unit for the first

time, confirm that the specifications printed on
the rear side of the housing are compatible with
the local mains voltage.

• Before using the power supply unit for the first

time, check the housing and the mains lead for
any damage. In the event of any
malfunction/operational defect or visible
damage, switch off the unit immediately and
secure it against unintended use.

• The equipment may only be opened/repaired by

qualified and trained personnel.

2. Description

The teslameter is used for the measurement of flux
densities in steady magnetic fields.

The unit includes a Hall sensor probe for measuring
axial and tangential magnetic fields up to 200 mT.
The magnetic field probe is provided with a metric
scale for measuring distances.

In addition to having a digital display, the unit
outputs a voltage proportional to the magnetic field
which can be measured with a data logger, XY­recorder or analogue multimeter.

The teslameter is available in 2 versions for differing
mains voltages. The teslameter with the order number
1003314 is for mains supplies of 230 V (±10%) while
the one with order no. 1003313 is for 115 V (±10%)
systems.

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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

) and tangential (BZ)

X

with LED indicator

X

with LED indicator

Z

X

Z

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.

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.

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: 0.01 mT
Accuracy: 2 % ±3 digits

Measurement range 200 mT

4.3 Measurement of tangential magnetic fields

The tangential Hall probe measures the component of
the magnetic flux density in the direction
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.

Resolution: 0.1 mT
Accuracy: 2 % ±1 digits

Digital display: 3½ digit LCD with sign
showing field direction

Height of digits: 13 mm
Input: BNC socket
Output: 4 mm safety sockets
Output voltage: 10 mV / mT (20 mT)
1 mV / mT (200 mT)
Dimensions of unit: 205 x 230 x 85 mm³
Dimensions of probe: 360 x 15 x 25 mm³

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.

4. Operation

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