BM-7/BM-7FAST Specifications
TECHNICAL SPECIFICATIONS

Measuring Field: Variable aperture selections of 2º, 1º, 0.2º, 0.1º
View Finder Field:
5º
Optical system:
Objective Lens: f=80mm, F2.5
Eyepiece lens adjustment range: ±5 diopter
Spectral Sensitivity Characteristics:
Similar to CIE 1931 color matching functions
Photo Cell: 3-Element Silicon Photodiode (X2, Y, Z)
Measuring Diameter
(Unit: mmf):
Field
Measuring distance (m)
 
2º
1º
0.2º
0.1º
0.35 0.5 1 5 10
10.0 15.4 32.8 169 341
5.0 7.7 16.4 85 170
1.0 1.5 3.3 17 34
0.5 0.8 1.6 8 17
Measuring Functions: x, y, L: (x, y) Chromaticity coordinates, (L) Luminance ±
u, v, L: (u, v) Chromaticity coordinates, (L) Luminance ±
Tc: Color temperature and duv; deviation ±
CIE 1976 L*a*b Eab* ±
CIE 1976 L*u*v Euv* ±
* ± means difference between standard value and measured value.
(For example, x, y, L will be given in x, y, L setting)
Display Intervals: BM-7 (approx. 2 sec), BM-7 FAST (approx. 0.5 sec)
Luminance Unit: Candela per square meter (cd/m2), Foot-Lambarts (fL) selectable
Luminance Measuring Range
(Unit: cd/m2):
Field 2º 1º 0.2º 0.1º
Full Range 0.085 ~
30,000
 0.035 ~
120,000
 8.5 ~ 
3,000,000
 		35.0 ~
12,000,000
Response Time (Unit: ms):
  Range 1 Range 2 Range 3 Range 4 Range 5
FAST 30 15 5 3 1
Luminance Accuracy: Luminance: ±2% of display value (for light source A, 23ºC measuring field 2º, 1cd/m2 or above, autorange)
Chromaticity: (x, y) within ±0.002 for standard source A, within ±0.01 (O-55, Y-48, T-44, A-73B, IRA-05), within ±0.03 (R-61, B-46, V-44, G-54)
(Standard light source A+ color filter)
(23ºC measuring field 2º, 1cd/m2 or above, autorange)
Calibration Standard: Select either the Topcon calibration standard (Standard light source A, 23ºC, ±3º, below 65% RH) or the user’s calibration standard
Display: LCD 20 digits x 4 lines with illumination function
Output  
Digital: GP-1B or RS-232C interface is selected at the time of purchase (*external computer control is possible)
Analog: Analog voltage output proportioned to X2, Y and Z
Response speed varies from 1 to 30 ms depending on the range used
Power Supply: AC adapter (standard accessory)
External Battery (special accessory)
Power Consuption: 8.5 VDC: approx. 450 mA
Operating Requirements: Temperature: 0 ~ 40ºC
Humidity: below 85% RH
External Dimensions: 325 (L) x 120 (W) x 165 (H) mm
Weight: 3 kg (main unit only)
Range: Auto / Manual 5 steps