Frederiksen Electromagnetic vibrator User manual

The Vibration Generator no. 2185.00 is a robust and
versatile apparatus especially well suited for all sorts
of wave experiments.
The Vibration Generator is essentially a loudspeaker.
A coil wound on a thin aluminium tube moves within
a permanent magnetic field when current of an al-
ternating nature is applied to it. The coil is controlled
by 2 suspensions for optimum guidance. Coupling
the Vibration Generator to external equipment is fa-
ciliated by an 8 mm dia. aluminium pin connected
to the coil. The pin is equipped with a 4 mm hole for
a banana plug connector.
N.B.
Most Vibration Generators of this type have 2 vulne-
rable points:
1. Mounting of accessorries will inevitably sooner or
later damage the moving parts.
2. Another frequent problem is when too high a cur-
rent is applied to the vibrator via the input termi-
nals.
We have eliminated these problems. The mechanical
problem is eliminated by supplying the apparatus
with a locking device. When set in the "Lock" positi-
on the centertap is locked, and accessories can be
mounted without any damage to the moving parts.
The second problem is eliminated by means of a fu-
se (1.0 A Fast, no. 4085.33), when too high a current
is applied the fuse is simply blown. Replace only
with a similary rated fuse!
When using the vibrator for the purpose of generat-
ing waves, we recommend the use of a function ge-
nerator e.g. no. 2502.50 or similar. However please
be sure that the applied current does not exceed
1 A.
To generate waves attach e.g. a wire, a spring or a
string using the provided banana plug connector.
Apply a signal e.g. from a function generator.
The Vibration Generator will vibrate at any frequency
ranging from 0.1-5 kHz and with amplitudes up to 7
mm at the low end of the frequency range.
Instruction Manual for the Vibration Generator no. 2185.00
19.07.14 Ae 2185.00
A/S Søren Frederiksen, Ølgod Tel. [phone] [email protected]
Viaduktvej 35 · DK-6870 Ølgod Fax [phone] www.frederiksen.eu
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The waveform need not be a sine wave, other wave-
forms such as square, triangular or sawtooth can be
used.
The Vibration Generator may be used sitting upright,
on its side, or inclined e.g. on an Overhead Project-
or. By means of the accessory no. 2185.05 the Vi-
bration Generator may be placed at any angle you
may choose, or use the accessories listed below to
perform the experiments of your choice.
Troub leshooting:
If at any time your Vibration Generator fails to work:
1. Check the fuse. If the fuse is blown replace it on-
ly with a similarly rated fuse. 1.0 A, 250 v, Fast.
When replacing the fuse make sure that the fuse-
holder is fully tightened.
2. If the fuse is not blown, check that the fuseholder
is fully tightened.
Operation:
1. Lock the drive arm by sliding the locking device
at the top to the "Lock" position. This protects
the apparatus while connecting external equip-
ment to the drive arm.
2. Use the banana plug connector to connect the
experimental apparatus of your choice to the
drive arm.
3. Unlock the drive arm.
4. Apply the signal from e.g. your function genera-
tor to the input terminals on the front of the Vi-
bration Generator.
5. Adjust the frequency and amplitude of the func-
tion generator to produce the desired waves. The
current should not to exceed 1.0 A.
6. When no longer in use set the locking device to
the "Lock" position, demount the equipment at-
tached to the drive arm, and store the apparatus.
Techn i c a l spec i f i c atio n s :
Frequency range: 0.1 Hz to 5 kHz.
Amplitude: 7 mm at 1 Hz, decreasing
with increasing frequency.
Input impedance: 8 ohm.
Max. current: 1.0 A, fuse limited.
Available accessories:
2185.05 Holder for top mounting.
2185.06 Holder for mounting in the Base.
2185.10 Piano wire loop.
2185.12 Banana plug connector.
2185.20 Chladni plate, square.
2185.25 Chladni plate, circular.
2185.30 Resonant steel strips.
2185.40 Rubber cord, 2 m.
2185.55 Kinetic gas theory set.
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