Filter
Top Products
1-4
remains unaffected so far as the field strength is within a few ten µT.
8. The allowable values given in Table 1-1 are applicable at the specified working
distances (4 mm at accelerating voltage 15 kV and 1.5 mm at 1 kV). At a longer
working distance, the allowable value of stray magnetic field becomes smaller.
(Namely, image is apt to be affected by stray magnetic field.)
1.1.7 Floor Vibration
You should measure the floor vibration at the place for installing the Model S-4700 in advance.
When the requirements given in Table 1-2 are satisfied, no image trouble will occur.
If the instrument is installed on the first floor in a reinforced concrete or steel frame building, the
instrument performance will not be degraded by external vibrations so long as vibration sources
such as heavy-duty machine tools or transportation facilities (electric car, for example) are not
operated nearby.
Table 1-2 Allowable Vibration
Floor vibration: Image trouble will not be observed when the conditions below are satisfied.
S-4800 Type I
S-4800 Type II
NOTICE: The allowable amplitude corresponds to an image deviation of less than 0.2 mm
on a 5 inches x 4 inches size micrograph at magnification 220,000×.
Vibration
Frequency
(Hz)
Allowable Amplitude (X, Y)
(µm Peak to Peak)
1.0 Less than 7.0
1.4 Less than 2.0
2.0 Less than 2.0
3.0 Less than 4.0
4.0 Less than 4.5
5.0 Less than 4.5
6.0 Less than 4.0
10.0 Less than 3.0
Vibration
Frequency
(Hz)
Allowable Amplitude (Z)
(µm Peak to Peak)
1.0 Less than 25.0
2.0 Less than 14.0
3.0 Less than 5.0
3.5 Less than 2.9
4.0 Less than 1.8
5.0 Less than 1.0
6.0 Less than 1.1
10.0 Less than 1.2
Vibration
Frequency
(Hz)
Allowable Amplitude (X, Y)
(µm Peak to Peak)
1.0 Less than 8.0
1.5 Less than 3.0
2.0 Less than 1.4
2.4 Less than 1.4
3.0 Less than 3.0
5.0 Less than 4.0
6.0 Less than 3.5
10.0 Less than 3.5
Vibration
Frequency
(Hz)
Allowable Amplitude (Z)
(µm Peak to Peak)
1.0 Less than 20.0
2.0 Less than 10.0
3.0 Less than 5.0
4.0 Less than 2.7
5.0 Less than 1.8
6.0 Less than 1.0
7.0 Less than 1.0
10.0 Less than 1.0