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3B SCIENTIFIC ® PHYSICS
230 V, 50/60 Hz: 1018884 / U207001-230
115 V, 50/60 Hz: 1018882 / U207001-115
Instruction sheet
07/16 UD/ALF
1. Safety instructions
Millikan's apparatus conforms to the safety
stipulations for electrical measuring, control and
laboratory instruments as specified in DIN EN
61010 part 1. It is intended for use in dry rooms
suitable
for
the
operation
equipment.
Safe operation of the equipment can be assured
as long as it is used as stipulated. However,
safety cannot be guaranteed if the equipment is
used incorrectly or handled without due care
and attention.
If it may be assumed that the equipment may no
longer be operated safely (e.g. in the event of
visible damage), it must be taken out of use
immediately.
Only use the equipment in dry rooms.
Only use with the plug-in power supply
provided.
2. Description
This version of Millikan's apparatus is a
compact
equipment
experiment set-up devised by Millikan which
does not require any radioactive source.
Comprising an experiment chamber kit for
assembly with plate capacitor and connected oil
Millikan's Apparatus
of
electrical
set
based
on
an
atomiser, lighting unit with two green LEDs,
measuring microscope, voltage adjustment
knob and switch to set the capacitor voltage,
switch for starting and stopping rise and fall time
measurements and a display unit with touch
screen.
Charged droplets of oil are created with the help
of an oil atomiser. They will have random
charge which then remains unaffected by
external influences. The oil droplets are
introduced into the experiment chamber from
above, just as in Millikan's original set-up.
Suitable oil drops are selected and their charge
measured by observing them through a
measuring microscope. For each of the
droplets, the time it takes to rise between two
chosen marks on the ocular's scale when an
electric field is applied is measured, as is the
time it takes to descend between the marks
when the field is switched off. Alternatively the
oil drops can be held stationary by an electric
field of suitable strength.
The rise and descent times measured for a
charged droplet, the electric field voltage setting
and readings for various relevant parameters,
temperature, viscosity and pressure,
displayed on the touch-sensitive screen.
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