Topcon SR-3AR Spectroradiometer

Topcon SR-3AR

NEW PRODUCT ALERT – As of February 2022, the Topcon SR-3AR has been replaced by the SR-5 Series. Please visit the SR-5 Series Product Page to learn more.

The SR-3AR Spectroradiometer is the first instrument in Topcon’s line of spectroradiometers. The SR-3AR provides increased color accuracy (±0.002 xy) and guaranteed accuracy luminance measurements down to 0.1 cd/m2

The four standard apertures (2° / 1° / 0.2° / 0.1°) are automatically selectable by the control panel or through the USB / RS-232 remote interfaces allowing you to optimize the measurement spot size (also a function of working distance) and the minimum measurable luminance level (larger apertures can measure lower levels).



Measure low luminance with accuracy

Measures luminance and color as low as 0.1 cd/m2 with high accuracy


Luminance, spectral distribution, and CCT measurements

Supports Luminance, Spectral Distribution, CIE1931 and CIE1976 chromaticity coordinates, Tristimulus value XYZ, CCT and Deviation, CIE1976 L*a*b*, Eab*± , CIE1976L*u*v* Euv*±


Four apertures available

Four (4) apertures 0.1°/0.2°/1°/2° enable you to measure luminance from small to wide area without attachment lens


Luminance, Chromaticity, and Color Temperature measurement of LCDs, CRTs, OLEDs, LEDs, etc

Transmittance of LCD polarizing plates & filters

Luminance and color measurement of various light sources

Step it up

For increased luminance sensitivity, faster measurements, and equal color accuracy, consider the Topcon SR-UL1R, and SR-UL2 Spectroradiometers. These ultra-sensitive instruments provide greater sensitivity for measuring low luminance levels with full spectral analysis. The SR-UL1R and SR-UL2 offer guaranteed luminances of 0.001 and 0.0005 cd/m2 respectively.

Parameter Aperture
0.2° 0.1°
Optical System Objective lens: f=82mm F2.5
Eyepiece lens: View field 5°, Diopter adjustment range ±5 diopter
Measurement Distance 350mm – Inf.
Luminance Range cd/m2 0.1 ~ 3,000 0.3 ~ 9,000 7.5 ~ 70,000 30 ~ 300,000
Spectral Range 380 ~ 780 nm range @ 1 nm resolution
Luminance Accuracy ±2% (for standard illuminant A)
Color Accuracy ±0.002 in 1931 CIE x,y Space
Spot Size at 1m 32.2 mm 16.1 mm 3.2 mm 1.6 mm
Min. Spot Size at 35cm 10 mm 5 mm 1 mm 0.5 mm
Dimensions Approx 406mm (L) x 150mm (W) x 239mm (H)

Ordering Information

The base unit model number is SR-3AR and includes:

  • Instrument with standard lens
  • AC adapter
  • Lens cap
  • Hard shell carrying case
  • Manual
  • USB Cable
  • CD containing CS-900A software

See the SR-3AR Brochure for available options. Popular options include:

  • AL-6 and AL-11 adapter lenses (for reducing the measurement spot)
  • Tripod and fine adjustment stand (gimbal)
  • Fiber optic probe

If you can’t find what you are looking for, contact us for info on Topcon options and accessories.

Want to find out more?

If you are interested in more information, send us an inquiry.