Using The Kill Cursors; Shape Correction - Changing The Size Calibration - Malvern Mastersizer Series Getting Started

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Shape correction - Changing the size
calibration
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G e t t i n g S t a r t e d

Using the Kill cursors

The kill cursors are produced by depressing the left mouse button with the cursor
in the left or right margin of the graph and then dragging the mouse towards the
centre of the graph. You will have to be in the Data view to use the kill data
cursors. When the grey cursor is at the correct position release the mouse button.
A small dialogue appears on the screen. At this point you can choose to either;
move the other cursor onto the graph, click the Apply button or Cancel the
operation.
For the kill data option the Apply button starts an analysis to produce a new
result with the required data channels removed. For the kill result option a new,
modified result is produced.
Each method of particle size measurement is likely to produce different results
when measuring the same sample. This is because different particle sizing
methods measure different physical characteristics of the particle. The particle
'diameter' is then implied by using some theoretical connection to the measured
parameters. Even image analysis can only produce an indisputable 'diameter' for a
particle if it is spherical and every particle in the sample must be spherical for the
distribution parameters to be 'correct'.
If you have measurements on a sample from an alternative particle sizing method
and wish to compare these with the results of the Mastersizer then you can use
Shape Correction to modify the characteristics of the Mastersizer so it measures
the same as the alternative method.
The modification method is called Shape Correction because the Mastersizer uses
a light scattering theory to convert measured data to a size distribution result and
the theory depends on the particles being near spherical. For non-spherical
particles a correction can be applied.
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