3B Scientific Light Sensor User Manual
3B SCIENTIFIC
Instruction Sheet
02/08 Hh
®
PHYSICS
Light Sensor U11364
1. Safety instructions
The light sensor must only be used for educational
purposes!
• The light sensor is not suitable for safety-
related applications!
2. Description
Sensor box incorporating photodiode with optical
filter for the measurement of light intensity (illuminance), especially in the visible region.
Push-button selection of measurement ranges 600
lx, 6000 lx or 150000 lx, with visual indication of
range.
8 mm light tube for excluding unwanted light from
sides.
The sensor box and range setting are recognised
automatically by the 3B NETlog
3. Equipment supplied
1 Sensor box
1 Stand with screw thread, 120 mm
1 miniDIN 8-pin connecting cable, 600 mm long
1 Instruction sheet for U11364
TM
.
4. Technical data
Measurement ranges 0 to 600 lx / 0.8 lx
and resolution 0 to 6000 lx / 8 lx
0 to 150000 lx / 200 lx
Sensor type: Silicon photodiode with
low dark current
Sensitivity: Typically 0.65 µA at 100
lx
Non-linearity: Max. ±1 % of the total
measurement range
Bandwidth: Typically 10 kHz
5. Operation
• Place the sensor box close to the experiment.
• Read off the light intensity value on the display
of the 3B NETlog
• If the light intensity exceeds the measurement
range, switch to the next higher range.
TM
.
1
6. Experimental applications
Investigation of the inverse square law for a point
light source
Properties of polarising filters
Demonstration of the flickering effect of alternat-
ing current for fluorescent lamps
Measurement of solar energy
Studies of reflection
Measurements of illuminance at work-stations and
personal areas
Relationship between light intensity and growth of
plants
7. Sample experiment
Investigation of the inverse square law for a
point light source
Apparatus needed:
1 3B NETlog
1 3B NETlab
TM
U11300
TM
U11310
1 Light sensor U11364
1 Experimental lamp, halogen U17140
1 Transformer 12 V, 60 VA U13900-230
(alternative to the variable transformer shown in
Fig. 1)
1 Barrel foot U8611200
1 Vertical ruler, 1 m U8401560
2 Universal clamps U13255
• Set up the experiment as shown in Fig. 1.
• On the 3B NETlab
TM
, open the application program (template) for the experiment with the
light sensor.
• Lay the ruler horizontally, and fix the experi-
mental lamp at the 15 cm mark using one of
the universal clamps.
• Define this point as distance zero, 0.
• Mount the light sensor on the ruler using the
other universal clamp.
• Connect the electric cables to the experimental
set-up and switch on.
• Start the template program, select “manual
input”, and measure the light intensity at the
first point, a distance of 5 cm in front of the
experimental lamp.
• Increase the distance in steps of 5 cm up to the
70 cm mark (a distance of 55 cm from the experimental lamp), and record the corresponding light intensities in the 3B NETlab
• Generate the data curve using the “Fit” func-
TM
(Fig. 2).
tion.
Fig. 1 Investigation of the inverse square law for a point
light source
Fig. 2 Plot of the data points from the inverse square
law experiment on the monitor screen of the 3B
NETlabTM (U11310)
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com
Subject to technical amendments
© Copyright 2008 3B Scientific GmbH
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