BM-5A 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: Photomultiplier Tube
Measuring Diameter
(Unit: mmf):
Field
Measuring distance (m)
 
2º
1º
0.2º
0.1º
0.52 0.6 0.8 1 2 5 10
9.7 12.6 19.7 26.7 60.9 165 350
4.9 6.3 9.9 13.3 30.4 82.4 175
1.0 1.3 2.0 2.7 6.1 16.5 35
0.5 0.6 1.0 1.3 3.0 8.2 17.5
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: FAST (approx. 2 sec), SLOW (approx. 10 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
Range 1 0.0001 ~
0.3
 0.0004 ~
1.2
 0.01 ~
30
 0.04 ~
120
Range 2 0.001~
3
 0.004~
12
 0.1 ~
300
 0.4 ~
1,200
Range 3 0.01 ~
30
 0.04 ~
120
 1 ~
3,000
 4 ~
12,000
Range 4 0.1 ~
300
 0.4 ~
1,200
 10 ~
30,000
 40 ~
120,000
Range 5 1 ~
3,000
 4 ~
12,000
 100 ~
300,000
 400 ~
1,200,000
Response Time (Unit: ms): 30
Luminance Accuracy: Luminance: ±4% of rdg, ±1 digit (for standard source A+ color filter 23ºC ±3ºC, within 65% RH autorange)
Chromaticity: (x, y) within ±0.005 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)
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
AD-4012JP (Insert plug)
AD-4012US (Ground type 2 poles insert connector)
AD-4012EX (Double ground 2 pin plug for class 1 instrument)
Purchase at the same time
Operating Requirements: Temperature: 0 ~ 40ºC
Humidity: below 85% RH
External Dimensions: 355 (L) x 130 (W) x 169 (H) mm
Weight: 4 kg (main unit only)
Range: Auto / Manual 5 steps