Loop Gain
Click on the
button in the Loop Gain selection box and select 8 from the
pull-down menu.
The setting determines the gain of the feedback circuit. The larger the set value is,
Source (S
•
W
ontact Mode tab
w
2.
Click on the
the higher the response gain becomes, thus obtaining a good image from an uneven
specimen surface, but the feedback circuit easily oscillates.
election of the acquired image type)
hen you observe a topography (shape image)
This image is the constant atomic force mode for observing the topography of a
specimen while keeping the repulsive force constant.
1.
Select the AFM radio button at the left bottom of the C
indow.
button in the Source 1 selection box and select Topography.
3.
Click on the
button in the Source 2 selection box and select None.
4.
Click on the
button in the Source TOPO selection box and select 1.
•
When you observe a force image
You can observe a force image (atomic force image) by obtaining the movement of
the cantilever as an image while keeping the distance between the cantilever and the
specimen constant.
5.
Select the AFM radio button at the left bottom of the Contact Mode tab
window.
6.
Click on the
button in the Source 1 selection box and select Force.
7.
Click on the
button in the Source 2 selection box and select None.
8.
Click on the
button in the Filter [Hz] selection box and select 0.5 or less.
When observing a force image, you keep the height of the cantilever constant and
usually observe the image performing a slow feedback. Select a slower response for
the feedback than that used for observing a topography image.
5-84
TMPM5200-2
