.
At least one result within the range of the Mastersizer. The Mastersizer re-
sult will be scaled to be the percentage below the smallest of these sizes.
The lower end of the Mastersizer may also be extended by entering manually a
value in the smallest size band of the Mastersizer in place of the value calculated
from the analysis.
See the Setup-Result Modification command and the Extended Result
dialogue in the Software reference manual for details of entering the extended
result.
Transforming result type
The basic result produced by the analysis is a volume distribution which is the
volume proportion in each size class of the total volume of the particles. It is
possible to convert the distribution to a different type. Probably the next most
useful distribution type after volume is that of number, where the number
proportion of particle in each size class is the tabulated quantity. The other two
types are surface and length distributions.
The transformation can be expressed mathematically as:
where X
i
is the transformed percentage distribution, V
i
is the volume distribution
result, d
i
is the mean size of class i and n is the required distribution type: 1 for
surface, 2 for length and 3 for number.
Note that a small volume of particles of small sizes can be transformed to a
significant part of a number distribution. If this small volume is just due to noise,
or other errors in the measurement, then it may swamp the actual desired
distribution. These small errors in the measurement are, in effect, magnified by
the transformation. You may consider using the Kill Result facility to isolate the
significant part of the volume distribution before doing the transformation.
See the Setup-Result Modification menu item in the Software reference
manual for details on setting up a result transformation.
X
Vd
Vd
i
ii
n
ii
n
=
∑
100 /
/
CHAPTER 10
GETTING STARTED
Page 10.7
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