Ligth Meter ALXP-1

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.

Specifications

• High accuracy and quick time response
• DATA-HOLD function.
• Internal memory built-in.
• High sampling rate and quick reaction for changes of luminance
• Auto power off.
• Display 3¾ digits.

The most important features of ALXP-1 are:

• Light-measuring levels ranging form 0,1Lx…0,1klx (0,01FC…0,01kfc)
• High accuracy and quick time response
• DATA-HOLD function for holding measured values
• Automatic zeroing
• Correction factor does not to be manually calculated for non-standard light sources
• High sampling rate and quick reaction for changes of luminance
• PEAK-HOLD function for tracing the peak signal of light pulse with least duration 10 µs and keep it.
• Auto power off (15 minutes) or disable Auto power off
• Maximum and mínimum measurement
• Relative reading
• Easy to read large backlit display
• USB output connect with PC
• Four measuring ranges
• Memory of 99 measurement results
• Data logger for more than 16000 results

Luminance measumerent
Range	Spectral accuracy	Accuracy
400,0 Lx 40,00 FC	Función f1’ ±6%	±(3% m.v. + 0,5% f.s.) (<10,000 Lx) ±(4% m.v. + 10 digits) (>10,000 Lx)
4000 Lx 400,0 FC
40,00 kLx 4000 FC
400,0 kLx 40,00 kFC
ATENTION: 1FC=10,76Lx; 1kLx=1000Lx; 1kFC=1000FC
“f.s.” means “full scale”
“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
Other technical data:
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:
Operating temperatura and humidity	0...40°C – RH  0% to 80%
Storage temperatura and humidity	-10...50°C – RH  0% to 70%

Standard accesories

• Battery 9V (1 pcs.)
• USB transmission cable
• CD with software “Light Meter” for measurement configuration
• Operating manual
• Calibration certificate issued by calibration laboratory (Warranty: 2 years)
• Carrying case

Optional accesories

• Software for protocols “FOTON”