B270 User Guide
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1.4 Specimen Stage
The stage has an adjustable height limit. This is used to prevent the stage from being raised too high which could result in
damaging the specimen or even the objective lenses. The adjustment screw is located on the body just behind the stage.
Rotate the objective turret until the 100X objective lens is in place. With a specimen mounted on the stage, slowly raise
the stage using the coarse-focus knob until the specimen is a few millimeters from the lens. Use the fine-focus knob to
continue raising the stage until the specimen barely comes in contact with the lens. The 100X lens has a spring-loaded
nose. If the nose begins to compress, the stage is too high. When the specimen is able to make contact with the lens
without compressing the nose, this is the appropriate maximum height. The height-adjustment screw should be tight
-
ened to set the stopping position. If the specimen was too far from the lens, and could not make contact, loosen the
adjustment screw slightly, then continue to make fine focus adjustments until the specimen is high enough. Once the
height is properly set, tighten the adjustment screw.
