46 Understanding Your Agilent ChemStation
2 Methods
Status of Methods
Status of Methods
A method can exist in two states: as a stored method, or as the current loaded
method.
Stored Methods
These are methods stored on the computer disk. Stored methods have a name
with up to forty alphanumeric characters followed by the extension .M.
Methods are stored in the ChemStation in up to three locations:
• The Master Method is stored in a methods subdirectory, available in a
Methods node of the ChemStation Explorer, and is not directly associated
with any data container.
• When a sequence is run (using the option Unique Folder Creation ON (see
“Preferences - Sequence Tab” on page 163), copies of all the master
methods used in the sequence are stored in the sequence data container
along with the sequence data files. These methods are directly linked to the
sequence, and are used as well when the sequence is reprocessed. Changes
to these methods are not propagated to the master methods. Changes are
propagated to the Sequence Container Method as well to the individual
methods (DA.M) during the sequence is reprocessed. If you now want to use
the updated sequence container method for data acquisition, you need
either to
• copy this method from the sequence data container to one of the defined
method paths or
• use the save as option to save the updated method as a master method.
The new/updated method is then available in the ChemStation Explorer
in the method view as a master method.
• In addition, two copies of the method used to run a sample are stored with
the data files - the data file individual methods ACQ.M and DA.M. ACQ.M is
the acquisition method, DA.M is the data analysis method. DA.M is the
method that is loaded along with the data file if the Load DA method from data
file checkbox in the Signal Options tab of the Preferences dialog box is
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