Topcon Luminance Colorimeter BM-5AC, Инструкция по эксплуатации

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2.Measurement Operation
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2.2 Various Measurement Examples
This section introduces various examples of measurement. Use these examples as references
when using this instrument.
2.2.1 Measuring a Light Source With Directivity
Data having good reproducibility sometimes cannot be obtained when observing a light source
with high directivity such as an LED or an uneven light source. If this happens, perform
measurement using a white board as shown below.
2.2.2 Measuring Minute Surfaces
When measuring minute samples smaller than the measurement diameter when the objective
lens is used, use the optional attachment lens. There are 2 types of attachment lenses, AL-6 and
AL-11.
The attachment lens is mounted using the screw on the tip end of the BM-5AC objective lens.
Also, when using the attachment lens, the correction factor for correcting the transmissivity of the
lens must be applied.
Setting the correction factor
☞
"3.2.4 Correction Factor"
The measurement diameter when the attachment lens is used is as follows.
AL-6
Measuring
Field
Measurement Diameter
(mm)
3° 2.91 to 4.14
2° 1.94 to 2.76
1° 0.97 to 1.38
0.2° 0.20 to 0.27
0.1° 0.10 to 0.13
*Measurement distance 43 to 57 mm(from the tip end of the metal fixture)
AL-11
Measuring
Field
Measurement Diameter
(mm)
3° 1.76 to 2.18
2° 1.18 to 1.45
1° 0.59 to 0.72
0.2° 0.12 to 0.14
0.1° 0.06 to 0.07
*Measurement distance 19.8 to 24.2 mm(from the tip end of the metal fixture)
Light source
White board
BM-5AC
Luminance = measurement value L x
luminance factor