F.A.Q.
HOW LONG DOES IT TAKE TO COLLECT A 3D DATA SET USING EDT?
It depends on several parameters:
- Software mode (computer controlled TEM) or hardware (using DigiStar precession hardware unit);
- Beam steps in the software data collection mode;
- Total tilt range of the goniometer;
- Total number of goniometer tilts;
- Single diffraction frame exposure time.
Typical examples are:
- Software mode, 0.1 ° beam tilt step, goniometer tilt range -70 ° / + 70 ° and tilt step of 2.8 °, exposure 0.5 sec – ~ 1 h / 1 h 15 min (~ 1500 frames).
- Software mode, 0.5 ° beam tilt step (only for unit cell determination), goniometer tilt range -40 ° / + 40 ° and tilt step of 2.8 °, exposure 0.5 sec – ~ 15/20 min (~ 90 frames).
- Hardware precession mode, 1 ° precession angle, goniometer tilt range -70 ° / + 70 ° and tilt step or 1 °, exposure 0.5 sec – ~ 20/30 min (141 frames).
HOW MUCH HARD DISK SPACE DOES IT TAKE FOR A SINGLE 3D DATASET?
It depends on the total number of frames recorded and on the size of a single diffraction frame. Considering the experimental conditions from the Question 1 and the frame size of 1024 * 1024 * 16 bits (~ 2.1 MB per frame including header size) the estimated storage required will be:
- ~ 3.1 GB;
- ~ 190 MB;
- ~ 300 MB.