11.2 Supplementary Manual for Metallurgical Model 78904-30 (cont.)
Assembly of the microscope
1.
Loosen the clamping screw (2, A) on the microscope and remove the binocular (or trinocular) head from the
body of microscope
2.
Insert the main body of the metallurgical attachment into the upper part of the microscope and tighten the
clamping screw
3.
Insert the binocular viewing head into the main body of the metallurgical attachment and tight the clamping
screw (2, B) to fix the head
Adjusting the Illumination
1.
Adjust the condenser knob (1, E) to the position where the image brightness in view is homogenous
2.
Adjust the field diaphragm (1, C) and aperture diaphragm (2, B) until the two diaphragm sizes are properly
selected
•
Aperture diaphragm: the aperture diaphragm (iris diaphragm) is designed for matching the objective’s
numerical aperture, not to be used for adjusting brightness. Adjust the diaphragm size until it is just out of
the field of view. When switching objectives, the aperture diaphragm size should be changed along with it.
•
Field diaphragm: is used to reduce stray light. Adjust the diaphragm size until it is just out of the field of view
for best operation
2
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