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The digital light meter is a precision instrument used to measure luminance (Lux, footcandle) in the field. It meets CIE photopic spectral response. It is fully cosine corrected for the angular incidence of light. The luminance meter is compact and easy to handle according to its construction. The light sensitive component used in the meter is a very stable, long-life silicon photo diode and spectral response filter.
The most important features of ALXP-1 are:
Luminance measumerent |
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Range |
Spectral accuracy |
Accuracy |
400,0 Lx |
Función f1’ |
±(3% m.v. + 0,5% f.s.) ±(4% m.v. + 10 digits) |
4000 Lx |
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40,00 kLx |
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400,0 kLx |
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ATENTION: 1FC=10,76Lx; 1kLx=1000Lx; 1kFC=1000FC |
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“f.s.” means “full scale” |
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“m.v..” means “measured value” |
Spectral sensitivity characteristic
The applied photo diode with filters makes that spectral sensitivity characteristic is well suited to the requirements of the C.I.E. curve (INTERCIONAL COMMISSION ON ILLUMINATION). Photo curve V (λ) as the following chart decribed.
Optional accesories
“FOTON” software for making protocols after measurement according to EN12464
ALXP-1 Specifications |
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Other technical data: |
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Display |
3¾ digits, LCD with high speed 40 segment bargraph |
Over range indication |
0L displayed |
Repeatability |
±3% |
Spectral response |
CIE photopic (CIE human eye response curve) |
Cosine response (f2’) |
±2% |
Sampling rate |
1,3 times/sec |
Power supply |
Battery 9V |
Photo detector |
One silicon photo diode and spectral response filter |
Photo detector lead length |
aprox. 150cm |
Photo detector dimensions |
115 × 60 × 20mm |
Meter dimensions |
170 × 80 ×40mm |
Weight |
390g |
Rated operational conditions: |
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Operating temperatura and humidity |
0...40°C – RH 0% to 80% |
Storage temperatura and humidity |
-10...50°C – RH 0% to 70% |
Standard accesories
Optional accesories
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Inquire for our Datalogging light meter prices.
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