Dell 3100 Especificações descarregar pdf (Página 132)

100

101

Head, Probe, & Sample Preparation

Basic AFM Operation

112 Dimension 3100 Manual Rev. D

Figure 7.2i Vision System Window

3. Center the laser detector signal using the photodetector adjustment knobs (see Figure 7.2i)

located on the left side of the Dimension head. The image monitor displays the laser signal

values and a schematic of the detector quadrants labeled Detector. The position of the laser

is denoted by a red dot on the detector schematic (see Figure 7.2i).

• The Vertical Deﬂection signal is the difference between the top and bottom

photodetectors. For TappingMode, adjust this signal to 0. For Contact Mode, adjust this

signal to -2 (see Figure 7.2j).

Note: In TappingMode, the RMS Ampl is an AC signal and does not have any real

magnitude until the cantilever tune has been completed.

Note: When the laser is positioned in the center of the detector schematic, the laser is

also in the center of the screen on the front of the head. If the laser is severely

out of alignment, it may help to ﬁrst center the laser on the screen on the head

using the photodetector adjustment knobs, then use the detector schematic on

the image monitor to ﬁnish positioning the laser.

Laser

Sum Signal

Detector

Schematic

Laser

Signal Values

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 375 376

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