Optronik FMS 10 Illuminance Colorimeter

A laboratory tristmulus colorimeter with research-grade performance

Further Information
» FMS 10 Datasheet	» Optronik Photometer Brochure

The Optronik FMS 10 is our research-grade, laboratory tristimulus colorimeter which is available with a choice of sensors which are precision-matched to the CIE X₁, X₂, Y & Z observer functions. The FMS 10 is a bench-top photometer for measuring both the colour and the illuminance of light sources in units of lux (lx).

Research-Grade Performance & Features

The FMS 10 has a dynamic range of 6 decades, providing measurements up to 600,000 lux with a resolution of 0.0001 lux. An RS-232C (serial) interface is fitted as standard, while optional LightCon FMS software provides PC control, test report generation, data storage and processing, graphical representation, isocolor diagrams and CIE tri-chromatic colour space diagrams.

Four Filtered Detectors for the Highest Colorimetric Accuracy

The FMS-10 employs four thermally stabilised silicon detectors in its sensor head, each of which is filtered to precisely match a CIE tristimulus XYZ observer function. The use of two detectors for the X function (X₁& X₂) significantly improves measurement accuracy compared with colorimeters that use only three detectors in total. Optronik developed one of the first digital lux meters in 1968 and is today acknowledged as a leader in the design and manufacture of precision photometric equipment. The proprietary tristimulus response filters consist of several elements designed to match the standard observer functions. The f₁' figure-of-merit (for the photopic, Y channel) is better than 1.5% at all wavelengths (for class L sensors per DIN 5032) or better than 2.0% (for the class A sensor). The out-of-band sensitivity in the IR and UV range is also reduced to below 0.1%. The careful design of the detectors ensures best-in-class accuracy and repeatability, even with monochromatic or narrow band radiation sources such as LEDs. The FMS 10 is available with a choice of 3 standard sensors with active areas of 14 and 60mm diameter. Depending upon the sensor, you can choose either a DIN class A (f₁' < 2.0%) or class L (f₁' < 1.5%) spectral response. The 14mm sensor was developed for improved accuracy with highly directional light sources with uneven light distributions. The smaller sensor area helps to ensure that the detector is fully illuminated even where the device under test has a narrow beam angle.

Specifications: FMS 10 Meter

Model Selection	Sensor Type
FMS 10-14L	CE 10-14L sensor (14mm, class L)
FMS 10-60A	CE 10-60A sensor (60mm, class A)
FMS 10-60L	CE 10-60L sensor (60mm, class L)
Specifications	For sensor specifications, see below
Measurement Units	lux (lx)
	Option: candelas (cd) or lumens (lm)
	X Y Z (CIE-LAB), x y Y (CIE-LAB), u v Y (CIE-LAB), u' v' Y (CIE-UCS 1976)
	T_cp (Kelvin)
Dynamic Range	6 decades
	Automatic range selection
Measurement Range	High: 600,000 lx
	Low: 2 lx (with 0.0001 lx resolution)
Display	Graphical 4-digit LCD with backlight
	Representation of CIE colour space diagram
Digital Interface	RS-232C (serial)
Compliance	DIN 5032 (class A or L); CIE No. 69
Dimensions (W x H x D)	450 x 325 x 135mm
Housing	19-inch rack mountable (3U)
	Option: benchtop housing with handle
Weight	8 kg
Power	230 ± 10% Volts, 50Hz
	< 50 VA consumption
Options
Display of alternative units (e.g. lumens)
PTB calibration certificate
Stray light tube & tridpod (for specific working distance/s)
Extended cable length between meter and sensor (5, 10, 15, 20 or 25m)
LightCon control software
Benchtop type housing with carrying handle

Specifications: CE-10 Series Sensors

CE 10-	14L	60A	60L
Type	Four silicon photodiodes
Aperture (mm)	14	60	60
V(l) f₁' (%)	< 1.5	< 2.0	< 1.5
UV & IR sensitivity (%)	< 0.1
Cosine Correction	No
Thermal Stabilisation	Yes
Thermal Drift a₀(%/K)	<0.01
DIN 5032 Class (Y channel)	L	A	L
Ev (min) (mlx)	1
Ev (max) (klx)	600
Calibration	Against luminous intensity standard lamp with calibration certificate from PTB (Physikalisch- Technische Bundesanstalt, Germany)
Uncertainty (%)	± 0.6 traceable to NIST
Dimensions (mm)	ø98 x 165
Weight (kg)	0.9
Cable Length (m)	3 (cable extensions optional - see above)
Data Supplied
Individual test report for spectral sensitivity
Specified errors per to DIN 5032 § 6 & 7 and CIE Publ. No. 69 (1987)
Optronik calibration certificate