FEI Quanta FEG 250, Руководство пользователя

Страница: 207 / 228

System Options: Quanta Morphologi
9-59
FIGURE 9-50 SETUP OF CONTRAST
USING VIDEOSCOPE AND USING COLOR TAB
RECOMMENDED SETTINGS
Several ways of image acquisition can be applied depending on the
character of particles. General recommendations for settings are
described below, but user tests must be done to found out the ideal
settings for each type of sample.
ITO slides
Low Vacuum
Symmetrical Low Vacuum Detector
Use: all types of conductive and nonconductive particles
• pressure of 50 – 130 Pa
• accelerating voltage: >= 5 kV
• spot size: >= 2.5
• free working distance (FWD): 7 - 10 mm
• image resolution: >= 1024x884
• dwell time: >= 10 µs
High Vacuum
ET detector:
conductive and selected non-conductive particles with
diameters of 100 nm and less
BSE detector: solid conductive and selected non-conductive
particles except those with atomic number close to 50
• accelerating voltage: >= 5 kV
• spot size: >= 2.5
• free working distance (FWD): 7 - 10 mm
• image resolution: >= 1024x884
• dwell time: >= 10 µs