Page 8-2 Lasair II Particle Counter Operations Manual
Chapter 8: Statistics Mode
Statistics Mode Screens
• Statistics Setup Screen: this screen is where you select the type of statistics you
wish to collect, set the appropriate parameters for the statistical method, and
enable or disable the Lasair II particle counter statistical mode.
• Statistics Data Screen: where you can see the data generated from the current
location as it is being generated.
• Statistics Location Summary Screen: where you can see a summary of the data
that has been collected from one or more locations.
• Sampling Setup Screen: Use this screen to select the correct location name,
and to set initial and inter-sample delays.
See the following sections for details about each screen.
The following screens are functionally changed when the statistics mode is
enabled:
• Sample Setup Screen
➢Sample size is locked when the statistics mode is enabled. Also, samples are
all by volume, not time.
➢The user can only display normalized counts, not raw counts.
➢Units cannot be changed while statistics is enabled.
➢Continuous sampling cannot be selected.
➢Group repeat mode cannot be selected.
➢The # Samples range is restricted depending on the standard you choose. If
Sample Acknowledge is ON, only one sample may be taken at a time.
➢When numeric locations are used, the location list is replaced by an integer
box.
• Main Display Screen
➢The differential counts column is replaced with a concentration limit target
column or, if the average mode is selected, a mean value column.
➢The standard and class is printed above the data table.
➢The analog data menu icon is replaced by a statistics menu icon. Analog data
is still available even though the menu is changed.
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