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LDM-9901 luminance detector head
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
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.
LDM-9901 luminance measurement head
rel. spectral responsitivity
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.
1,0
0,5
0,0
350
450
550
650
750
850
w avelength nm
LDM-9901
CIE photometric curve
LDM-9901 typical spectral responsivity
70 cm
140 cm
infinity
Simple measurement field focusing using notch and
bead sight for three measurement distance ranges
LDM-9901 data sheet / Gigahertz-Optik GmbH - D 82299 Tuerkenfeld - www.gigahertz-optik.com
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Specifications
Spectral
f1 Measurement
Typical
Imax Lens Ø Cable Operation
Plug types
responsivity
field angle
responsivity
length temperature
V(λ)
≤ 5%
1.1°
25 pA/cd*m² 1mA 22 mm 2 m
0-40°C
-1, -2, -4
LDM-9901
LDM-99Z-01 Adapter with level for tripod mounting of the LDM-9901
LDM-99Z-02 Lens hood for the LDM-9901. Also ideal for contact measurements on screens and light boxes.
K-LDM9901-I Re-calibration of the luminance responsivity in A/cd/m²
Re-calibration of the relative spectral responsivity in the visible spectral range
K-VIS-SR
Model
Measurement field size in relation to the measurement distance
Measurement distance
Measurement field diameter
0.5 m
Ø 31 mm
0.7 m
Ø 35 mm
1m
Ø ~41 mm
5m
Ø 120 mm
10 m
Ø 220 mm
50 m
Ø 1000 mm
100 m
Ø 2000 mm
Notch
Eye
Illumination
field
Measurement
field diameter
Bead sight
LDM-9901 setup using rear and front sights
LDM-9901 data sheet / Gigahertz-Optik GmbH - D 82299 Tuerkenfeld - www.gigahertz-optik.com
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LDM-99Z-01 adapter for tripod mounting
LDM-99Z-01 tripod mount (optional)
LDM-99Z-02 lens hood
Purchasing information
Model
Item number
Description
LDM-9901-1
100076
Measurement head with BNC plug, calibration certificate
LDM-9901-2
100077
Measurement head with calibration data plug, calibration certificate
LDM-9901-4
100442
Measurement head with ITT plug, calibration certificate
LDM-99Z-01
100138
Adapter for tripod mounting. Integrated level
LDM-99Z-02
100674
Lens hood
K-LDM9901-I
300461
Re-calibration of the luminance responsivity
K-VIS-SR
301208
Re-calibration of the relative spectral responsivity
LDM-9901 data sheet / Gigahertz-Optik GmbH - D 82299 Tuerkenfeld - www.gigahertz-optik.com

薄い、曲がる、そして明るく均一に照光。