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3.9 Archiving Updates
Data from the instrument's internal memory is archived to
external memory in the following circumstances:
• Automatically, if 'Update type' is set to 'Automatic' – see
Section 4.5.6.
• When the operator selects 'Update' from the Setup menu
– see Section 3.3.
• When a 'Digital update source' assigned to 'Archive
update' (see section 4.5.6) becomes active.
If there is un-archived data more than one day old (Binary format)
or one hour old (Text format) when the external media is inserted
or placed on-line, or when 'Update' is selected from the Setup
menu, the operator is prompted to select the data to be
archived:
If a large amount of Text format unarchived data exists, a
progress bar appears. During this time operator views cannot be
accessed, but new data continues to be recorded to the internal
buffer memory.
3.10 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 32.
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 amount of time that data remains in the
instrument's internal memory depends on the sample rate and
the number of channels selected. See Table A3.1 on page 113
for details.
3.11 Archive Wrap
Archiving can be configured to delete the oldest archived
data file automatically from the external media when the
media approaches its maximum capacity – see 'Wrap' on
page 70.
3 SET UP
3.8 Archiving Online/Offline
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 (Binary format) or <1 hour (Text format) 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 (Binary format) or >1 hour (Text format) 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 ) is
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 ) is
displayed. Change the media immediately to prevent loss
of data.
Note. Data stored in the internal memory buffer can
still be transferred to the archive media when the
archive media is placed on-line again (providing it is not
off-line so long that the un-archived data in the internal
memory is overwritten).