Setup & Installation
Component List
Rev. B
MultiMode SPM Instruction Manual
55
Figure 3.2f
Installing the Head
7. Recheck all cable connections. Review the steps above one last time to ensure that all
connections are properly made. Make certain that the controller cable is NOT plugged into
the parallel port of the computer or damage to the electronics will result.
3.2.2 Vibration Isolation
The microscope must be isolated from sources of vibration in the acoustic and sub-acoustic
frequencies. This requirement can be relaxed somewhat for large-scale images, but atomic-scale
imaging is sensitive to ordinary room vibrations.
Adequate vibration isolation can usually be obtained with the black vibration isolation pad supplied
with the system. In many cases, the pad provides enough vibration isolation to run the microscope
on the table, but the pads are especially effective when placed on a massive object isolated from the
fan noise of the computer.
Another effective vibration isolation system consists of a large mass, 20 or more pounds, suspended
from elastic bungee cords. The mass should stretch the cords at least one foot, but not so much that
the cords reach their elastic limit. The SPM should be placed on the large mass having a natural
frequency of about 1 Hz or less both vertically and horizontally. Test this by gently pushing on the
mass and measure the rate at which it swings or bounces. A ready-to-use tripod isolation system is
also available from Veeco (model TRVI). Experience suggests that air tables often have poor
horizontal isolation. If an air table is used, it may require additional horizontal isolation for atomic-
scale images.
As a
fi
nal note, the best way to reduce coupling from vibrations is to eliminate as many sources of
vibration as possible. Remember that vibrations can be transmitted to the SPM over the cables. To
reduce this phenomenon, prevent tension in the cables and keep them away from fans and other
noise sources. Also, keep the microscope away from sources of acoustic noise. Loud noises
(including conversation) can disrupt atomic images, so it is best to isolate the SPM as much as
possible. Use the noise reduction hood supplied with the system to alleviate acoustic noise.
Front View
Rear View
Plug head into
support ring here.
(Shown: “A” scanner)
