The new BM-5AC replaces the BM-5AS and provides higher accuracy color filters for improved chromaticity measurements.
The BM-5AC luminance colorimeter offers a dramatic improvement in luminance sensitivity and speed over the BM-7A. By adding a fifth measurement aperture (3°), larger spot sizes (at a given working distance) can be achieved and luminance down to 0.00005 cd/m2 can be measured. Its Photo Multiplier Tube (PMT) sensor, combined with a precision CIE tri-stimulus filter wheel, provides measurements of the CIE tri-stimulus values (X,Y,Z). From these, the calibrated Luminance and Chromaticity coordinates (and other derived data) are computed and displayed on the integral LCD. Measurement data is available through a USB or RS-232C interface if remote control is required.
Two macro lens options allow for measurement of very small objects or light sources down to 0.06 mm (60 um). The engineering / research grade BM-5AC forms the center piece of many low light measurement solutions. The user selectable measurement aperture (knob) allows 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).
Measure low luminance quickly
Luminance as low as 0.005cd/m2 with 2 sec intervals at 3°
Supports luminance, chromaticity, and CCT measurements
Supports Luminance, CIE1931 and CIE1976 chromaticity coordinates, Tristimulus value XYZ, CCT and Deviation, CIE1976 L*a*b*, Eab*± , CIE1976L*u*v* Euv*±
Five apertures available
Five (5) apertures 0.1°/0.2°/1°/2°/3° 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 to the SR Series
For spectral measurements and greater color accuracy, consider the Topcon SR-3AR, SR-UL1R, and SR-UL2 Spectroradiometers. This next generation of diffraction grating based instruments provides three levels of sensitivity with a minimum measurable luminance (at guaranteed accuracy) of 0.1, 0.001, and 0.0005 cd/m2 respectively. Spectral data is measured in the visible band (380 nm ~ 780 nm) with a 1 nm resolution. All models include four standard apertures: 2° / 1° / 0.2° / 0.1°.
|Optical System||Objective lens: f=80mm F2.5
Eyepiece lens: View field 5°, Diopter adjustment range ±5 diopter
|Measurement Distance||350mm – Inf.|
|Luminance Range cd/m2||0.00005 ~ 1,500||0.0001 ~ 3,000||0.0004 ~ 12,000||0.01 ~ 300,000||0.04 ~ 1,200,000|
|Luminance Accuracy||±4% (for standard illuminant A)|
|Color Accuracy||±0.005 in 1931 CIE x,y Space|
|Spot Size at 1m||49.2 mm||32.8 mm||16.4 mm||3.3 mm||1.6 mm|
|Min. Spot Size at 35cm||15 mm||10 mm||5 mm||1 mm||0.5 mm|
|Dimensions||Approx 355mm (L) x 154mm (W) x 212mm (H)|
See the BM-5AC 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
- CM-700 application software
If you can’t find what you are looking for, contact us for info on Topcon options and accessories.