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VL-3708
Class L Detector head for the measurement of photopic illuminance in Lux
- f1' ≤ 1.5 %
- f2 ≤ 1.5 %
- 0.5 nA/lx
- 20 mm height
- for use with Optometers and amplifiers, calibration certificate
Illuminance is the most frequently made measurement within general and specialist lighting applications. The two most important qualities required of a high precision illuminance detector are
- a spectral responsivity that is very well matched to the ideal V(λ) photopic curve
- and a spatial response that provides cosine correction.
VL-3708 illuminance detector
The VL-3708 meets the highest standard of DIN Class L for its spectral match and the highest defined standards of DIN Class A classification for cosine correction (class L is not defined for cosine response).
Photometric detectors are a very good solution for simple and fast measurement of illuminance and also allow a very wide dynamic range of measured illuminance (lux). With additional calibrations and in conjunction with accessories such as lenses, integrating spheres and goniometers, other photometric parameters such as luminance (cd/m²), luminous flux (lumen) and luminous intensity (cd) can be measured.
It is identical to the VL-3701 in all other parameters.
Calibration
Meaningful measurements in absolute units such as illuminance in lx require the calibration of a measuring device with traceability to National Metrology Institute (NMI) standards. The Gigahertz-Optik calibration laboratory has been accredited since 1993 by the PTB (Physikalisch-Technische Bundesanstalt) and the DAkkS (the German national accreditation body) for the calibration of spectral sensitivity and spectral irradiance. Since then, our factory calibrations have been based on the calibration standards and quality management of the accredited calibration laboratory. Thus, the factory calibrations of Gigahertz-Optik already offer the highest level of traceability and have been accepted as a quality standard by customers all over the world for many years.
To meet the particular requirements of some industrial sectors, part of the calibration laboratory is accredited by the DAkkS as a test laboratory according to DIN EN ISO / IEC 17025. For this reason, in addition to the factory certificate, Gigahertz-Optik can optionally offer a DIN EN ISO / IEC 17025 certificate for the detector VL-3701 in connection with a measuring device.
As standard, the VL-3708 detector is calibrated for both its illuminance responsivity and relative spectral responsivity.
Typical spectral responsivity of the VL-3708 detector.
Typical field of view with precise cosine correction
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