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7 Operation Documentation set
SL 800 7.7 Reading the angular difference between illumination and observation unit
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7.7 Reading the angular difference between
illumination and observation unit
The scale on the swivel joint enables you to read or adjust the
angular difference between the illumination and observation unit.
In order to increase the angular accuracy to the accuracy of 1°, a
vernier is used. The scale is divided into two parts. The upper scale
has a 5° graduation. On the lower index scale there is the scale
index marked with 0 and four further graduation marks. Of these
five graduation marks, exactly one always forms a line with a
graduation mark on the upper scale.
Action
u
Read the value of the angle as follows:
If the scale index marked with 0, for example, stands between 35°
and 40°, this limits the range of the deflection angle to a value
between 35° and 40°. The smaller value is the first value of the
angle to be determined (in the example: 35°).
The graduation mark on the index scale, which forms a line with a
graduation mark on the upper scale, then gives the second value of
the angle to be determined (in the example: 2°).
The angular difference between illumination and observation unit is
the sum of the two single values (in the example: 35° + 2° = 37°).