DM745-HDM11 User Guide
Page 13
Calibration
The calibration section is used to select precalibrated magnification profiles or to define custom profiles. A magnification
profile defines the relationship between camera pixels and real units of measure such as millimeters. Once this relation
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ship is defined, any shape drawn on the screen will provide accurate measurements by translating the number of pixels
into the desired unit of measure.
Calibration Tool
The calibration tool has two options: “Line Calibration” and “Calibration by Circle”. To select the desired tool, click on the
down arrow next to the icon.
Profiles
Profiles are predefined for key magnifications, and can be selected for use with the corresponding magnifications to per
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form accurate measurement functions. When using any magnification which is not already have a profile, the calibration
process must be performed to produce accurate results.
Units
Units defines the measurement unit to be displayed when performing measuring functions.
Line Calibration
To perform the calibration process, a ruler will be needed for reference. For low magnifications, a ruler with millimeter
graduations is usually adequate. For high magnifications, a ruler with finer graduations may be needed, such as a mi
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crometer slide. Place the ruler under the microscope’s lens so it can be viewed on the screen. The ruler needs to be in
clear focus with multiple, clearly-distinguishable graduations visible on the screen.
Click on the ruler icon in the main panel’s calibration section. Using this tool, a line will be drawn over the image of the
ruler. Click the left mouse button to create the first anchor point. As the cursor is moved, a line will be displayed. The line
should span as many readable graduations as possible, and should be parallel to the ruler’s edge to improve the preci
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sion. Move the cursor along the image of the ruler until it has spanned an adequate number of graduations, then click
the left mouse button again to create the second anchor point. A popup window will be displayed. Enter a name for the
profile, the length of the measurement, and the current magnification. If you are not using a keyboard, double-click on
each appropriate field to enable the on-screen keyboard. Once finished with the calibration, click on any measurement
tool to use the profile.
Once saved, the profile will be listed in the main panel’s drop-down selector. With the profile selected, you can select the
desired unit of measure to display on-screen measurements in that unit.
Calibration by Circle
This calibration is similar to line calibration, except it uses a circle which can be useful when referencing premeasured
diameters. Click the left mouse button to create the first anchor point on the edge of the reference circle. As the cursor is
moved, a line will be displayed. Move the cursor to the opposite side of the circle, then click the left mouse button again
to create the second anchor point. A circle will now be displayed. Move the cursor to enlarge or reduce the size of the
circle. Once the circle is properly sized, click the left mouse button. A popup window will be displayed. Enter a name for
the profile, the length of the measurement, and the current magnification. If you are not using a keyboard, double-click
on each appropriate field to enable the on-screen keyboard. Once finished with the calibration, click on any measure
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ment tool to use the profile.
Once saved, the profile will be listed in the main panel’s drop-down selector. With the profile selected, you can select the
desired unit of measure to display on-screen measurements in that unit.
