Optronik Digilux 9500 Illuminance Photometer

The very highest accuracy, laboratory illuminance (lux) meter

Optronik's Digilux 9500 is a research-grade, laboratory illuminance photometer which is available with a choice of sensors which are precision-matched to the CIE standard observer for photopic vision V(l). The Digilux is a bench-top photometer for measuring the illuminance of light sources in units of lux (lx). Optionally, the meter can be configured to report luminous intensity in candelas (cd) or luminous flux in lumens (lm).

Research-Grade Performance & Features

The Digilux 9500 is available with a dynamic range of 6 decades (7 or 8 are optional), allowing its use with both dim and bright light sources. The meter offers a resolution as low as 0.0001 lux as well as a full scale of 2,000,000 lux. The range can be set automatically or manually. An RS-232C (serial) interface is fitted as standard, while optional Digilux control PC software provides the ability to store and evaluate measurements as well as export results in an Excel-compatible format.

Proprietary Filter Technology for Highest Photometric Accuracy

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. Proprietary photopic filters consist of several elements designed to match the CIE V(l) photopic response curve with an f₁' figure-of-merit of better than 1.5% at all wavelengths (for class L sensors per DIN 5032 and CIE No. 69). 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 Digilux 9500 is available with a choice of 8 standard sensors with active areas of 1, 6, 10, 12 and 30mm diameter. Depending upon the sensor, you can choose either a DIN class A (f₁' < 3.0 or 2.5%) or class L (f₁' < 1.5%) spectral response, with or without a cosine diffuser and with the further option of thermostatic control of the sensor head.

Specifications: Digilux 9500 Meter

Model Selection	Sensor Type
Digilux 9500-1A	FE 10-1A sensor (1mm, class A)
Digilux 9500-6A	FE 10-6A sensor (6mm, class A, cosine diffuser)
Digilux 9500-10A	FE 10-10A sensor (10mm, class A)
Digilux 9500-10L	FE 10-10L sensor (10mm, class L)
Digilux 9500-12A	FE 10-12A sensor (12mm, class A, cosine diffuser)
Digilux 9500-12L	FE 10-12L sensor (12mm, class L, cosine diffuser)
Digilux 9500-30A	FE 10-30A sensor (30mm, class A)
Digilux 9500-30L	FE 10-30L sensor (30mm, class L)
Specifications	For sensor specifications, see below
Measurement Units	lux (lx)
	Option: candelas (cd) or lumens (lm)
Dynamic Range	6, 7 or 8 decades
	Manual & automatic range selection
Measurement Range	High: 200,000 lx
	Option: 2,000,000 lx
	Low: 2 lx (with 0.0001 lx resolution)
	Option: 0.2 lx (with 0.00001 lx resolution)
Display	3½ or 4½ digit LED (yellow/green, 7 segment)
Adjustable Attenuator Factor	0.001 ... 99.99
Measurement Speed	5/second (20ms sampling)
	Automatic averaging for pulsed sources
Digital Interface	RS-232C (serial)
Analogue Output	Optional
Compliance	DIN 5032 (class A or L); CIE No. 69
Dimensions (W x H x D)	291 x 88 x 199mm
Weight	2.85 kg
Power	80 ... 270 Volts, 40 ... 400Hz (w/o switching)
	< 20 VA consumption
	Option: rechargable battery operation
Options
Range extension for low level illuminance (0.01 mlx)
Range extension for high level illuminance (2 Mlx)
Display of alternative units (e.g. lumens)
Built-in rechargeable battery pack
Analogue output
On-board memory for storing ~ 1,000 readings
Programmable limit switches x 4
PTB calibration certificate
Stray light tube & tridpod (for specific working distance/s)
Extended cable length between meter and sensor (5, 10 or 20m)
Hard sided case
Digilux control software

Specifications: FE-10 Series Sensors

FE 10-	1A	6A	10A	10L	12A	12L	30A	30L
Type	Silicon photodiode
Aperture (mm)	1	6	10	10	12	12	30	30
V(l) f₁' (%)	< 3.0	< 2.5	< 2.5	< 1.5	< 2.5	< 1.5	< 2.5	< 1.5
UV & IR sensitivity (%)	< 0.1
Cosine Correction	No	Yes	No	No	Yes	Yes	No	No
Cosine Error f₂ (%)	-	< 1.5	-	-	< 1.5	< 1.5	-	-
Thermal Stabilisation	No	No	Yes	Yes	Yes	Yes	Yes	Yes
Thermal Drift a₀(%/K)	< 0.1	< 0.1	<0.01	<0.01	<0.01	<0.01	<0.01	<0.01
DIN 5032 Class	A	A	A	L	A	L	A	L
Ev (min) (mlx)	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
Option (mlx)	-	-	0.01	0.01	0.01	0.01	0.01	0.01
Ev (max) (Mlx)	0.2	2	0.2	0.2	0.2	0.2	0.2	0.2
Calibration	Against luminous intensity standard lamp with calibration certificate from PTB (Physikalisch-Technische Bundesanstalt, Germany)
Uncertainty (%)	± 0.6 traceable to NIST
Dimensions (mm)	ø21.5 x 28.5	ø21.5 x 28.5	ø50 x 50	ø50 x 50	ø50 x 50	ø50 x 50	ø50 x 50	ø50 x 50
Weight (g)	35	35	159	159	159	159	159	159
Cable Length (m)	2 (cable extensions optional - see above)
Data Supplied
Individual test report for spectral sensitivity
Individual test report for directional response (if applicable)
Specified errors per to DIN 5032 § 6 & 7 and CIE Publ. No. 69 (1987)
Optronik calibration certificate