Ultra Low Luminance Spectroradiometer
NEW PRODUCT ALERT – As of February 2022, the Topcon SR-UL2 has been replaced by the SR-5 Series. Please visit the SR-5 Series Product Page to learn more.
Reaching down to 0.0005 cd/m2, the Topcon SR-UL2 Spectroradiometer offers a further 2x improvement in low light sensitivity over the SR-UL1R. That means this spectroradiometer competes directly with the leading low light (PMT-based) photometers while providing the increased color accuracy and full spectral measurements available only in a diffraction grating and linear CCD based system.
The SR-UL2 provides increased color accuracy (±0.002 xy) and guaranteed accuracy luminance measurements down to 0.0005 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 (knob is eliminated) and allow you to optimize the measurement spot size (also a function of working distance) and the minimum measureable luminance level (larger apertures can measure lower levels).
With auto-sync measurements (for flickering light sources), programmable integration time, and a normal/fast mode, the SR-UL2 sets a new standard for full-featured, low-light (< 0.1 cd/m2) instruments.
Measure low luminance with accuracy
Measures luminance and color as low as 0.0005 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 a wider dynamic range, from ultra-low luminance of 0.0005 cd/m2 up to 500,000,000 cd/m2 consider the Topcon SR-5A Spectroradiometer. This ultra-sensitive instrument can measure high luminance while still providing greater sensitivity for measuring very low luminance levels with full spectral analysis.
|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||0.0005 ~ 3,000||0.0015 ~ 9,000||0.0375 ~ 70,000||0.15 ~ 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)|
The base unit model number is SR-UL2 and includes:
- Instrument with standard lens
- AC adapter
- Lens cap
- Hard shell carrying case
- USB Cable
- CD containing CS-900A software
See the SR-UL2 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.