®
Model No.PS-2177
Introduction
2
About the Sensor
The PS-2177 Light Level Sensor uses a silicon photodiode that produces a voltage
that is proportional to light intensity. The photodiode has a spectral response range
from 320 to 730 nanometers (nm) and a peak sensitivity at 560 nm, which is very
close to the peak sensitivity wavelength of the human eye. The maximum dark cur-
rent is 10 picoamperes at one volt. The accuracy is ±10%.
Light Level Ranges
The sensor has three ranges which can be selected using the range select buttons on
the sensor. The range for each button is represented by an icon.
Illuminance: Typical Readings
The following table shows typical readings for a variety of conditions
Usage
The sensor can be used for a variety of experiments.
•
Plant growth versus light intensity.
•
Light intensity through polarized filters.
•
Amounts of solar energy in various locations.
•
Relationship of light intensity versus distance for a point source.
Icon
Light Level
Resolution
Candle
0 to 1,500 lux
0.5 lux
Light bulb
0 to 15,000 lux
5 lux
Sun
0 to 150,000 lux
50 lux
Condition
Illuminance (lx)
Condition
Illuminance (lx)
Sunlight
100,000
Quarter moon
0.01
Full daylight
10,000
Starlight
0.001
Overcast day
1,000
Warehouse
150
Very dark day
100
Offices, labs
500
Twilight
10
Supermarkets
750
Deep twilight
1
Operating rooms
1,000
Full moon
0.1
Detailed drawing work
1,500 to 2,000
PS-2500 PASPORT
Extension Cable
