3B Scientific Teltron Helmholtz Coils D User Manual

3B SCIENTIFIC

Helmholtz Pair of Coils D 1000644

Instruction sheet

07/12 ALF

®

PHYSICS

1 Coil
2 4-mm-sockets
3 Stand rod
4 Securing sleeves

1. Description

The Helmholtz coils are used to create magnetic
fields for deflecting electron beams and are at­tached to the tube holder D (1008507). The tube
holder allows the coils to be set up in Helmholtz
configuration to generate a highly uniform mag­netic field perpendicular to the axis of the tube.

The two air-filled coils are made of lacquered
copper wire on a plastic bobbin on an insulating
stand rod with plastic sleeves for insertion into
specially drilled holes on the demonstration tube
holder. Connections are labelled from the start
(A) to the end (Z) of the coil winding.

2. Technical data

Number of winding
turns: 320 each

Coil diameter: 136 mm approx.
Rod: 145 mm x 8 mm Ø
Max. current:

continuous: 1.0 A
momentary: 1.5 A (max. 10 min)

2.0 A (max. 3 min)

Effective impedance: 6 Ω approx.
Connectors: 4-mm socket

Magnetic flux B in
Helmholtz-configuration: B = k * I, where
k = appr. 4,2 mT/A

1

3. Operation

• Insert the Helmholtz tubes into the holder

with the connections facing outwards.

• Push the sleeves on the rod upwards and

insert the rod into the holes at an angle.

• Push the sleeves into the holes to secure

the coils.

• For series connection, connect socket Z of

coil 1 to socket Z of coil 2 (refer to Fig 1.1).

III

Take into account the total current when calcu-

lating B.

• For parallel connection, connect socket A of

coil 1 to socket Z of coil 2 and socket Z of
coil 1 to socket A of coil 2 (refer to Fig 1.2).

To calculate B the total current 2 I should be

halved since both coils have the same resis-

tance and half the current I passes through each

one.

III

Fig. 1.1 Series connection Fig. 1.2 Parallel connection
Make sure the connectors of each coil are facing outwards.

A TELTRON Product from UK3B Scientific Ltd. ▪ Suite 1 Formal House, Oldmixon Crescent ▪ Weston-super-Mare

Somerset BS24 9AY ▪ Tel [phone] ▪ Fax [phone] ▪ e-mail [e-mail]

Technical amendments are possible

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