The additional user-defined derived parameters include the following:
.
Obscuration.
.
Percentages above, between or below a specified particle size.
.
Arithmetic and Geometric Standard Deviations.
.
Aux x1, the auxiliary port used.
.
Rosin-Rammler and Log-normal parameters.
Full details of all these parameters are given in Chapter 10.
Experiments, records and files
This section clarifies the meaning of some common terms.
Experiments and records
An experiment is defined as everything that happens during one full run of an
SOP, or between pressing the Start and Stop buttons to make a manual
measurement.
During the experiment a single measurement or a series of measurements is
taken. For a nasal spray this could be 2500 individual measurements made within
a one second experiment. Each of these measurements will produce data for a
series of parameters for that individual snapshot. This data is stored in a single
record.
The record is the fundamental unit of storage. It contains all the information for
an individual measurement, including the original measurement data and all
parameters that have been set to calculate the size distribution.
Records are stored within a measurement file, grouped as one or more
experiments. A measurement file can contain just one record or multiple
experiments, each containing a series of records.
Saving data - the measurement file
Each time a measurement is made the measurement data are saved to a
measurement file. This has the extension .smea.
Measurement file management depends on user preference. For example:
.
A separate measurement file can be used for each type of spray.
.
A separate measurement file can be used for each study or work pro
-
gramme.
CHAPTER 2
Spraytec Page 2.11
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