Topcon Optical Instrument Comparison
Westar carries a full line of Topcon optical instruments. If you need to measure light, we can help you select which Topcon photometer, colorimeter, spectroradiometer, color video photometer, or response detector is right for your application.
Specifications | SR Series | BM Series | ||||||
---|---|---|---|---|---|---|---|---|
Optical System | SR-LEDH | SR-5A | SR-UL2 | SR-UL1R | SR-3AR | BM-5AC | BM-7AC | BM-9A |
Objective Lens | f=82mm F2.5 | f=82mm F2.5 | f=80mm F2.5 | f=36mm F2.5 | ||||
Eyepiece Lens | Collimating lens: View field 5° |
View field 5°, Diopter adjustment range ±5 diopter |
View field 5°, Diopter adjustment range ±5 diopter |
View field 5° | ||||
Apertures | 2° / 1° collimation only | 2° / 1° / 0.2°/ 0.1° | 3° / 2° / 1° / 0.2°/ 0.1° | 2° / 1° / 0.2°/ 0.1° | 2° / 1° / 0.2° | |||
Measurement Distance | 350 mm to Inf. | 250 mm to Inf. | 350 mm to Inf. | 350 mm to Inf. | ||||
Spot Size at 1m | SR-LEDH | SR-5A | SR-UL2 | SR-UL1R | SR-3AR | BM-5AC | BM-7AC | BM-9A |
2° | 32.2 mm | 32.2 mm | 32.8 mm | 32.3 mm | ||||
1° | 16.1 mm | 16.1 mm | 16.4 mm | 16.2 mm | ||||
0.2° | NA | 3.2 mm | 3.3 mm | 3.23 mm | ||||
0.1° | NA | 1.6 mm | 1.6 mm | NA | ||||
Spot Size at 35cm | SR-LEDH | SR-5A | SR-UL2 | SR-UL1R | SR-3AR | BM-5AC | BM-7AC | BM-9A |
2° | 10 mm | 10 mm | 10 mm | 9.5 mm | ||||
1° | 5 mm | 5 mm | 5 mm | 4.8 mm | ||||
0.2° | NA | 1 mm | 1 mm | 0.95 mm | ||||
0.1° | NA | 0.5 mm | 0.5 mm | NA | ||||
Luminance Range | SR-LEDH | SR-5A | SR-UL2 | SR-UL1R | SR-3AR | BM-5AC | BM-7AC | BM-9A |
Min Lv (cd/m2) | 10 | 0.0005 | 0.0005 | 0.001 | 0.1 | 0.00005 | 0.01 | 0.01 |
Max Lv (cd/m2) | 4,500,000 | 500,000,000 | 300,000 | 1,200,000 | 12,000,000 | 28,000,000 | ||
Accuracy | SR-LEDH | SR-5A | SR-UL2 | SR-UL1R | SR-3AR | BM-5AC | BM-7AC | BM-9A |
Luminance Accuracy | ±2% (for standard illuminant A) | ±4% (for standard illuminant A) | ±4% for L under 5 cd/m2, ±2% for L over 5 cd/m2 | ±2% of reading ±2 digit | ||||
Color Accuracy | ±0.002 in 1931 CIE x,y Space | ±0.0015 in 1931 CIE x,y Space | ±0.002 in 1931 CIE x,y Space | ±0.005 in 1931 CIE x,y Space | ±0.002 in 1931 CIE x,y Space | NA | ||
More Info | LEDH | 5A | UL2 | UL1R | 3AR | BM-5AC | BM-7AC | BM-9A |
Link to Product Page | SR-LEDH | SR-5A | SR-UL2 | SR-UL1R | SR-3AR | BM-5AC | BM-7AC | BM-9A |