Larson Davis 831, User Manual

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Model 831 Manual Data Explorer 17-9
For standard files that are named with the user selected
default filename and a three digit sequential number
extension (831_Data.001), the first number in the extension
will be changed to a letter, from "A" through "Z", that offers
a unique filename and will then be saved to the USB Flash
Drive. The filename on the internal drive will not be altered.
For auto-store files (one whose name is made from the date
of measurement, i.e. 08010700.LD0) the digit of the
extension will be incremented from 0 through 9 (i.e. LD0,
LD1, and so on to LD9). If this method does not succeed in
creating a unique filename then the extension will be
changed to "A00" and the "A" will be changed, if needed, up
through "Z" until a unique filename is found.
If a unique filename cannot be determined by these methods
then the file will not be copied to the USB Flash Drive, but
will remain on the internal drive:
Example 1
The USB Flash Drive has been used as a transport for data
and currently contains files named 831_Data.001,
831_Data.002 and 831_Data.003. Perhaps I forgot to erase
the drive, but more likely I just like to keep an extra copy of
the data as a backup. The data inside the instrument was
reset and deleted with the Delete All Internal command from
Data Explorer so that new data files were named the same as
previously (starting the sequence number over at 001). More
data has been taken and the internal drive has two files
named 831_Data.001 and 831_Data.002. When you perform
a Move all to USB from the Data Explorer memory the
filename conflict will be detected and the names of the files
that will actually be stored to the USB Flash Drive will be
named 831_Data.A01 and 831_Data.A02. If I did this again
the new files would be named 831_Data.B01 and
831_Data.B02.
Example 2
The USB Flash Drive is being used to transport data from
three instruments used as remote noise monitors that
automatically do daily auto-stores. There are data for one
week on each instrument for a total of seven files each. All
seven files are moved to the USB Flash Drive from the first
instrument, 08010700.LD0 through 08011300.LD0. At the
second instrument, that has seven files with the exact names,