Hitachi TM3000 Instruction Manual page 173

4. TOPO Sets the observation image to the topo display. This method is useful when the
topographic information is to be exaggerated during the observation.
When TOPO is selected, the information area in the lower right part of the observation
screen is indicated by a [T] mark (see 4.3.2).
Figure 4.3.12-6 Setting an Image Mode (TOPO Mode)
NOTE : If the View mode is in the Freeze mode, the image mode cannot be changed. In
the Shadow 1, Shadow 2, and TOPO modes, turning the displayed image by using
the rotation function causes the orientation of shadows also to change according
to the angle of rotation. Changing the image mode with electron beam irradiation
on causes the execution of Auto B/C adjustments. If the View mode is in the
Freeze mode, the image mode cannot be changed.
NOTE : The greater the value of D (the distance from the specimen surface to the
back-scattered electron detector, as displayed in the information area in the lower
right part of the observation screen), the weaker is the contrast of the image. In
particular, if the image mode is Shadow 1, Shadow 2, or TOPO, a large D value
reduces contrast. To produce a favorable contrast, use the image in COMPO
position (see 4.2.2 6., 7.).
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