3B Scientific Teltron NMR Supplementary Set User Manual

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3B SCIENTIFIC

NMR Supplementary Set 1000642

Instruction manual

06/12 ALF

®

PHYSICS

1 Magnet unit
1a Magnet
1b Yoke
2 Discs for assembly
3 NMR probe
4 Polystyrene sample
5 Comparison sample
6 Glycerine sample
7 Teflon sample

1. Safety instructions

The permanent magnets can generate consid­erable forces of attraction and repulsion with the
result that there is a risk of squashing or splin­tering.

• Be especially cautious when inserting mag­nets into the basic unit.

• Never use the magnets except as specified.

Magnetic fields can erase data from magnetic
media and affect or destroy electronic or me­chanical components like heart pacemakers.

• People with pacemakers should not conduct
this experiment.

2. Description

The NMR supplement set is to be used with the
ESR/NMR basic set (1000637 resp. 1000638) for
investigating nuclear spin resonance in glycerine,
polystyrene and Teflon.

The set consists of an NMR probe with a high­frequency coil, a strong and uniform permanent
magnet, a glycerine sample, a polystyrene sam­ple, a Teflon sample, an empty comparison sam­ple and two discs for assembling the apparatus.

3. Technical data

Magnetic flux of
permanent magnets: 300 mT approx.

Frequency range: 11 − 15 MHz approx.

4. Maintenance and storage

• Remove any debris from the surfaces of the
permanent magnet poles and of the assem­bly discs using a cloth with some isopropanol.

• Keep permanent magnets in a dry place.

5. Disposal

• The packaging should

be disposed of at local
recycling points.

• If the equipment itsel

needs to be scrapped, it is
safe to dispose of all com
ponents other than the
probe in domestic waste.

The probe should be disposed of in containers
dedicated to the disposal of electrical refuse.

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6. Equipment required in addition

1 ESR/NMR basic set (230 V, 50/60 Hz) 1000638
or
1 ESR/NMR basic set (115 V, 50/60 Hz) 1000637

1 Analogue oscilloscope, 2x30 MHz 1002727
2 High-frequency cables 1002746

alternatively

1 3B NETlog™ unit (230 V, 50/60 Hz) 1000540

or

1 3B NETlog™ unit (115, 50/60 Hz) 1000539

assembly discs (see Fig. 4).

• Push back the two discs with your thumbs and
pull on the coils to move the magnet supports
into their end positions (see Fig. 5).

• Tighten both knurled screws by hand at the
same time. Make sure that the magnets are
accurately aligned on top of the assembly
discs. If necessary, slot the discs all the way
back into the probe chamber and then push
the magnet supports into their end positions.

1 3B NETlab™ 1000544

2 High-frequency cables, BNC/4-mm plug 1002748
1 PC

7. Operation

7.1 Assembly of the basic unit

The discs, the pole surfaces of the magnets and
the probe chamber in the basic unit must all be
free of grease, dust and debris.

• If necessary they should be cleaned using
isopropanol.

• Insert the discs into both sides of the sample
chamber (see Fig. 1).

Fig. 2 Permanent magnet inserted into basic unit

Fig. 1 Sample chamber with assembly discs inserted

• Twist the metal rod into the yoke of the
magnet unit. Place the magnet unit in the
clip on the basic unit as shown in Fig. 2.

• Take the magnet unit in both hands and push
the yoke downwards with your thumbs (see
Fig. 3).

• Push the coils over the magnets, making
sure the direction if the windings is the
same. The embossed arrows on the coils
must point in the same direction.

• Clean any grit or metal shavings off the two
magnets with a cloth.

• Move the completed magnetic unit onto the
assembly discs, making sure to carry out the
steps that follow: (see Fig. 4).

• Separate the two coils with your hands, pull­ing them outwards to increase the gap be­tween them. You can rest your hands on the
knurled screws while doing this. Push the
magnets about a quarter of the way onto the

Fig. 3 Removing the yoke from the permanent mag­net

Fig. 4 Pulling the two permanent magnets apart

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