The above (a) and (b) are basically dependent on in assembling error of the instrument. These are measured and corrected once in the beginning (before delivery of the instrument). But since the beam irradiation position may shift when adjusting the electron beam axis, this measurement tool is provided to enable measurement and correction at any time.
In the other hand, the specimen height error (the above (c)) will change whenever specimens are exchanged. It shall be compensated at each specimen exchange to get best accuracy.
It is not necessary when you use the eucentric rotation function with no tilting condition.
(1) Specifing eucentric or
Check the Eucentric check box in the XYR block to enable the eucentric rotation.
It is effective when rotate R axis by specifying the angle value. Not effective when rotate R axis using continuous rotation.
Check the Eucentric Tilt check box in the Z/Tilt block to enable the eucentric Tilt.
It is effective when tilting specimen by specifying the angle value. Not effective when using continuous tilting.
(2) Calibration
Following calibration commands are provided.
(a)Measure and correct the deviation between rotation center axis and beam irradiation position.
(b)Measure and correct the deviation between tilt center axis and beam irradiation position.
(c)Measure and correct the deviation between rotation center axis and beam irradiation position caused by changing Z axis position.
(d)Measure the specimen height error and compensate the rotation center and the tilt center axes.
The above (a) to (c) are basically dependent on in assembling error of the instrument. These are measured and corrected once in the beginning (before delivery of the instrument). But since the beam irradiation position may shift when adjusting the electron beam axis, this measurement tool is provided to enable measurement and correction at any time.
In the other hand, the specimen height error (the above (d)) will change whenever specimens are exchanged. It shall be compensated at each specimen exchange to get best accuracy.
It is not necessary when you use the eucentric rotation function with no tilting condition.
To carry out the calibrations, use a flat sample and set the specimen height as close to the standard height as possible.
CAUTION
The R, Z and T axes of the stage are driven automatically in this series of operations. So before starting operation, check the following points.
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