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2. Description
The Stefan-Boltzmann lamp is a high tempera-
ture source with a tungsten filament. It is de-
signed to produce thermal radiation and for in-
vestigating how such radiation depends on the
temperature. It can be used to confirm the
Stefan-Boltzmann law, as stated in the following
equation:
4
P
A
T
.
P in this equation is the power radiated, T is the
absolute temperature of the filament, A is the
area of the filament's surface, σ is the Stefan-
Boltzmann constant and ε is a dimensionless
constant of a value between 0 and 1. The tem-
perature of the lamp can be determined from
the resistance of the filament.
The filament represents a good approximation
of a point source of heat radiation and is thus
highly suitable for investigating the inverse
square law for heat radiation.
3. Equipment
1 Stefan Boltzmann Lamp
1 Stand Rod, 130 mm long
4. Technical data
Nominal voltage:
Nominal current:
Nominal power:
Max. operating parameters:
Maximum temperature
of filament:
Distance of filament
from rod:
5. Sample measurements
Additionally required:
1 Thermopile
1 DC Power Supply, 20 V, 5 A (@230V)
or
1 DC Power Supply, 20 V, 5 A (@115V)
1 Digital Multimeter P3340
2 Digital Multimeters P1035
2 Barrel Feet, 1 kg
1 Set of 15 Safety Experiment Leads, 75 cm
12 V DC
1.75 A
21 W
13 V DC/2 A
3600 K
25 mm
1000824
1003312
1003311
1002785
1002781
1002834
1002843
2
5.1 Measurement of filament resistance at
room temperature
Insert one of the measuring leads into the
COM socket of the digital multimeter P3340
(1002785) and one into its V
then short the leads together.
Select the
measuring range, wait for
zero to be displayed and then briefly press
the REL button.
Break the contact between the leads and in-
sert them into the sockets of the Stefan-
Boltzmann lamp.
Read off the resistance value R
a note of it (Tab. 1).
Remove the measuring leads.
Use the multimeter's temperature sensor to
measure the ambient temperature T
vicinity of the lamp in Kelvin and make a
note of it (Tab. 1).
Tab. 1: Value of filament resistance measured at
room temperature
R
ref
T
ref
mA socket,
and make
ref
in the
ref
0.541
297 K