Hinds Instruments EXICOR 150AT, User Manual, Page: 50 / 95

Chapter 4: Software Interface
40 Exicor 150AT User Manual
In order to access the auto calibration feature, check the Enable Auto-Calibration
box. Auto-offset settings are defined in 2 ways:
11. By Time: take offsets on a time interval
12. By position: take offsets based on X-Y stage position
To change the number of single measurements averaged together for the auto-
calibration measurement, enter a new number in the field provided.
The most useful way to do offsets on the Exicor 150AT is by time. The position
method is more useful for other Exicor models. Both methods are described below.
Offsets by Time
When offsets are measured on a time basis, the system will take a measurement
offset before each scan then periodically during the scan. To use auto-calibration on
a time basis, select
Time from the drop-down menu.
To change the time between offset measurements (during the scan), change the
value in the field provided (units: seconds).
To change the location for the automatic offset measurement, select Change
Location , edit the values for the x,y coordinate of the offset measurement.
Note: The auto-calibration location must be a position on the sample
stage where no sample is present and the beam is unobstructed
(not blocked). Once set, click OK to save settings.
With the default settings as shown in the figure above, the system will make 5 offset
measurements and average them together for the air offset. It will do this every 20
minutes (1200 seconds) during each scan.