Topcon BM-7A - Appendix; Specifications

Appendix
81
Appendix
Specifications
Measurement angle
2°/1°/0.2°/0.1°Switch type
Optical system
Finder visual field : 5°
Objective lens : f = 80㎜ F2.5
Spectral sensitivity characteristics
Similar to color matching function CIE 1931
* Satisfies router conditions JIS Z 8724-1997.
Photo-detector
Silicon photodiode 3-element type (X
２
, Ｙ, Ｚ)
Measurement diameter
(Unit: ㎜φ)
Measurement
angle
Measurement distance (ｍ)
0.35 0.5 1 5 10
2° 10.0 15.4 32.8 169 341
1° 5.0 7.7 16.4 85 170
0.２° 1.0 1.5 3.3 17 34
0.１° 0.5 0.8 1.6 8 17
* Some changes may occur according to the aperture mirror.
* The measurement distance is the distance from the tip end of the form of the objective lens.
Measurement Functions
The following measurement can be performed by using display mode.
x, y, L (x, y: Chromaticity coordinates, L: Luminance) ±⊿
u', v', L (u', v': Chromaticity coordinates, L: Luminance) ±⊿
X, Y, Z (X, Y, Z: Tristimulus values) ±⊿
Tc, duv, L (Tc: Color temperature, duv: Deviation) ±⊿
CIE 1976 L*a*b* ⊿Eab* ±⊿
CIE 1976 L*u*v* ⊿Euv* ±⊿
* ±⊿ indicates the difference from the reference value.
For example, in the case of x, y and L, it means ⊿x, ⊿y and ⊿L.