Page Page 8-2 8-2 LASAIR LASAIR II II Operator’s Operator’s ManualManual
Chapter 8: Statistics ModeChapter 8: Statistics Mode
StatStatistics Mode istics Mode ScreensScreens
••
Statistics Setup ScreenStatistics Setup Screen
: this screen is where you select the : this screen is where you select the type of statisticstype of statistics
you wish to collect, set the appropriate parameters for the statistical method,you wish to collect, set the appropriate parameters for the statistical method,
and enable or disable the and enable or disable the LASAIR II statistical mode.LASAIR II statistical mode.
••
Statistics Data Screen:Statistics Data Screen:
where you can see the data generated from thewhere you can see the data generated from the
current location as it is being generated.current location as it is being generated.
••
Statistics Location Summary Screen:Statistics Location Summary Screen:
where you can see a summary of thewhere you can see a summary of the
data that has been collected from one or more locations.data that has been collected from one or more locations.
••
Sampling Setup ScreenSampling Setup Screen
: Use this screen to select the correct : Use this screen to select the correct locationlocation
name, and to set initial and inter-sample delays.name, and to set initial and inter-sample delays.
See the following sections for details about each screen.See the following sections for details about each screen.
The following screens are functionally changed when the statistics mode isThe following screens are functionally changed when the statistics mode is
enabled:enabled:
•• Sample Setup ScreenSample Setup Screen
➢➢ Sample size is locked wheSample size is locked when the statistics mode is enabled. Also, samplesn the statistics mode is enabled. Also, samples
are all by volume, not time.are all by volume, not time.
➢➢
The user can only display normalized counts, not raw counts.The user can only display normalized counts, not raw counts.
➢➢ Units cannot be changed while statistics is enabled.Units cannot be changed while statistics is enabled.
➢➢ Continuous sampling cannot be selected.Continuous sampling cannot be selected.
➢➢ Group repeat mode cannot be selected.Group repeat mode cannot be selected.
➢➢
TheThe
# Samples# Samples
range is restricted depending on the standard you choose.range is restricted depending on the standard you choose.
IfIf Sample AcknowledgeSample Acknowledgeis ON, only one sample may be taken at a time.is ON, only one sample may be taken at a time.
➢➢ When numeric locations are used, the location list is replaced by anWhen numeric locations are used, the location list is replaced by an
integer box.integer box.
•• Main Display ScreenMain Display Screen
➢➢ The differential counts column is replaced with aThe differential counts column is replaced with a concentration limitconcentration limit
targettargetcolumn or, if thecolumn or, if the averageaveragemode is selected, amode is selected, a mean valuemean valuecolumn.column.
➢➢ The standard and class is printed above the data table.The standard and class is printed above the data table.
➢➢
The analog data menu icon The analog data menu icon is replaced by a statistics menu icon. Analogis replaced by a statistics menu icon. Analog
data is still available even though the menu is changed.data is still available even though the menu is changed.
Cleanliness Cleanliness StStandardsandards
The standards tables are reproductions of the targets for each of the internationalThe standards tables are reproductions of the targets for each of the international
standards supported by the LASAIR II. The blank areas of the tables representstandards supported by the LASAIR II. The blank areas of the tables represent
invalid settings. For example, the ISO 14644-1 standard does not allowinvalid settings. For example, the ISO 14644-1 standard does not allow
certification of a class 1 cleanroom using a 0.3+ µm particle size.certification of a class 1 cleanroom using a 0.3+ µm particle size.
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