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Precise and easy to use

The extremely compact LDM-9901 luminance measurement head has a fixed 1.1° measurement field angle at measurement distances starting from 0.4m to infinity. Its 5% photometric matching corresponds to the DIN 5032 quality class B. 

Measurement field aim over notch and bead sight 

Measurement field focusing with the LDM-9901 luminance detector head is done by aim over notch and bead sight for three different measurement distance ranges. . 

Minimal scattered light 

Since the LDM-9901 does not have any viewing optics inside, its internal scattered light is very minimal. It is therefore well suited for measurement of low luminance levels in measurement fields with higher ambience luminance. 

Traceable calibration 

The calibration of the luminance responsivity is performed by Gigahertz-Optik‘s calibration laboratory for optical measurands. The calibration certificate contains all the information as stipulated by the ISO 17025 specifications.

typical spectral responsivity
Simple measurement field focusing using notch and bead sight for three measurement distance ranges
fix using rear and front sights
LDM-99Z-01 adapter for tripod mounting
LDM-99Z-01 tripod mount (optional)
LDM-99Z-02 lens hood
Calibration
Calibration K-LDM9901-I: Calibration of the illuminance responsivity in A/lx using a halogen calibration lamp with a color temperature of 2856 K and 1600 lx.
Calibration K-VIS-SR: Calibration of the relative spectral responsivity in the visible spectral range
Specification
spectral responsivity photometric V(λ)
f1' f1 ≤ 5 %
typical responsivity

25 pA/(cd/m²)

Max. signal current 1 mA
Field of View 1.1°
Input optics 22 mm Ø lens
Alignment Notch and Bead Sight
Miscellaneous
Connector

coaxial cable 2m Long, with BNC (-1), calibration data (-2) or ITT (-4) connector

temperature range

(5 - 40) °C

Type Description File-Type Download
Datasheet LDM-9901 PDF
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Article-Nr Modell Description Request / Compare
Product
100076 LDM-9901-1 Detector head with -1 connector, calibration certificate
15295303 LDM-9901-2

Detector head with -2 connector, calibration certificate

15295682 LDM-9901-4

Detector head with -4 connector, calibration certificate

Re-calibration
15300377 K-LDM9901-I

Re-calibration of the luminance responsivity

15300579 K-VIS-SR

Re-calibration of the relative spectral responsivity

Accessories
100138 LDM-99Z-01

Adapter for tripod mounting. Integrated level

100674 LDM-99Z-02

Lens hood

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