Magnification Calibration
UltraScan Use
r
’s Guide Reference Series Rev 1.0
2-7
•
Once a week if the camera is always on, or
•
Before acquiring any important images.
2.6 Magnification Calibration
The displayed nominal magnification on TEM is for photographic film and has
an accuracy of 5-10%. The CCD camera is located on a different plane (height
wise) respect to the film camera. As a consequence, the magnification must be
calibrated. The calibration is done using Reference calibration samples.
At “Low” magnifications:
•
Use “cross grating sample” or any sample having known spacing
At “High” magnifications:
•
Use “graphite” or any crystalline samples having known lattice spacing
•
Use the FFT method.
It is very important to make sure DigitalMicrograph software correctly reads
the TEM magnification. If the communication between the computer and the
TEM is established, the magnification is read automatically. Otherwise, please
make sure DigitalMicrograph is set to prompt the user to enter a value for TEM
magnification every time an image is to be acquired. This can be set by
choosing the “Global Microscope Info” window shown in Figure 2-5 under the
Microscope menu (Figure 2-6).
Содержание UltraScan 894
Страница 21: ...Magnification Calibration UltraScan User s Guide Reference Series Rev 1 0 2 13 Figure 2 15 Calibration window...
Страница 30: ...Image Saving and Printing UltraScan User s Guide Reference Series Rev 1 0 3 9 Figure 3 10 Control palette...
Страница 46: ...A2 Description UltraScan User s Guide Reference Series Rev 1 0 VIII Figure A 7 Controller s back panel...
Страница 55: ...UltraScan User s Guide Reference Series Rev 1 0 XVII Appendix 2 CE certification...
