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LASAIR
LASAIR II
II Operator’s
Operator’s Manual
Manual
Chapter 8: Statistics Mode
Chapter 8: Statistics Mode
Stat
Statistics Mode
istics Mode Screens
Screens
••
Statistics Setup Screen
Statistics Setup Screen
: this screen is where you select the
: this screen is where you select the type of statistics
type 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 the
where 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 the
where 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 Screen
Sampling Setup Screen
: Use this screen to select the correct
: Use this screen to select the correct location
location
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 is
The following screens are functionally changed when the statistics mode is
enabled:
enabled:
••
Sample Setup Screen
Sample Setup Screen
➢
➢
Sample size is locked whe
Sample size is locked when the statistics mode is enabled. Also, samples
n 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.
➢
➢
The
The
# Samples
# Samples
range is restricted depending on the standard you choose.
range is restricted depending on the standard you choose.
If
If
Sample Acknowledge
Sample Acknowledge
is 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 an
When numeric locations are used, the location list is replaced by an
integer box.
integer box.
••
Main Display Screen
Main Display Screen
➢
➢
The differential counts column is replaced with a
The differential counts column is replaced with a
concentration limit
concentration limit
target
target
column or, if the
column or, if the
average
average
mode is selected, a
mode is selected, a
mean value
mean value
column.
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. Analog
is 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 St
Standards
andards
The standards tables are reproductions of the targets for each of the international
The standards tables are reproductions of the targets for each of the international
standards supported by the LASAIR II. The blank areas of the tables represent
standards supported by the LASAIR II. The blank areas of the tables represent
invalid settings. For example, the ISO 14644-1 standard does not allow
invalid 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.
