SM3000
Multipoint Videographic Recorder
5 Setup
48
IM/SM3000–EN Rev. L
5.5.7 Log files
A new log file is created under the following conditions:
When an existing valid log file does not exist on an
external archive media card inserted in the instrument.
When the maximum size (64,000 entries) is exceeded.
When the daylight saving period starts or ends.
Files containing log data generated during the daylight saving
period (summertime) have “~DS” appended to the filename.
5.5.8 On-line/Off-line
Before data can be archived to external media, the external
media must be placed on-line and one or more archive file
enables set.
When an external archive media card is inserted and there
is <1 day of data in internal memory, a dialog box is
displayed giving the user the choice of putting the media
on-line or remaining off-line. If no selection is made within
10 seconds, the media card is placed on-line
automatically:
When an external archive media card is inserted and there
is >1 day of data in internal memory, a dialog box is
displayed prompting the user to select either the data to
be archived or remain off-line:
External archive media can be set on-line (if a media card
is inserted) or off-line in the setup menu.
Set archiving off-line before removing external media to
prevent loss of data and possible damage to the media
card.
When external archive media contains approximately 250
files, its read/write performance begins to degrade and
either of the 'Warning – Too Many Files' icons (
or
)
are displayed. Change the media as soon as possible.
When external archive media contains approximately 300
files, its read/write performance becomes too slow,
Archiving is stopped automatically and the 'Too Many Files
– Archiving Stopped' icons (
alternating with
) are
displayed. Change the media immediately to prevent loss
of data.
5.5.9 Data Verification and Integrity
When data is saved to the archive media it is checked
automatically to verify that the data stored on the media
matches exactly what is stored in the internal memory.
Each block of data in the channel data files has its own data
integrity check. This enables the integrity of the data stored on
the external media card to be verified when it is viewed using the
DataManager software package.
The log files also contain built-in integrity checks enabling the
integrity of the data to be verified by the DataManager software.
5.5.10 Backing Up Archived Data
It is advisable to back-up critical data stored on SmartMedia or
Compact Flash cards on a regular basis. The instrument's
internal memory provides a buffer for the most recent data so if
data stored on archive media is lost, it can be re-archived – see
'Reset archiving' on page 43.
To ensure that all required data is available for re-archiving, it is
recommended that data archived on archive media is removed
and backed-up before the instrument's internal buffer overwrites
that data. The length of time for which data remains in the
instrument's internal memory depends on the sample rate and
the number of channels selected – see Table C.1 on page 170
for details.
5.5.11 Archive Wrap
Archiving can be configured to delete the oldest archived data
file from the external media automatically when the media
approaches its maximum capacity – see 'Wrap' on page 85.
