Commissioning
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optek-Manual--1004-1022-02--156-US-2017-12-11
9.5
Setting the measuring range
You can set the measuring range at the DIP switch below the measuring range
plate on the front. The following 5 measuring ranges are available as standard:
• 0 - 1 CU
• 0 - 2 CU
• 0 - 3 CU
• 0 - 4 CU
• VARIABLE: 0 - 0.5 to 0 - 4 CU (factory setting 0 - 0.5 CU)
CU as a unit is defined as the negative decadic logarithm of light intensity chan-
ge. This means: A measuring result increase by 1 CU corresponds to a light
beam attenuation of 90 %. This results in the following conversion:
Tab. 4
Relation between measuring result and attenuation of light
Measuring result (CU)
Remaining light (%)
0.00
100.0
0.05
89.1
0.10
79.4
0.20
63.1
0.50
31.6
1.00
10.0
2.00
1.0
3.00
0.1
4.00
0.01
5.00
0.001
6.00
0.0001
