Copyright © Sigicom AB 2021
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3.2.3.
Transient Recording
When an instantaneous value exceeds the selected trigger level, a transient
recording is initiated. A transient recording can also be initiated via the
Menu of the graphical user interface (“Manual trigger”, see section 5.8).
The trigger level can be changed through INFRA Net or the graphical user
interface. The maximum and minimum value depends on the selected
measurement standard. The trigger level is common for all standards
having the same unit, e.g.
mm/s
.
Note!
It is very important to set to an adequate trigger level. When set too
high, there will be no recordings. If, on the other hand, the level is set too
low, there will be lots of (continuous) triggering/recordings, which would
lead to:
•
Increase of battery consumption.
•
Lots of data storage on memory card.
•
High data transfer rate/cost.
The length of the recording is 1 second before the trigger point plus an
adjustable time between 1 and 40 seconds. The adjustable time is referred
to as “Record time” in the graphical user interface and “Transient time” in
INFRA Net.
For the maximum value (“EVT” in the graphical user interface) of the
channel transients, a frequency is estimated using a zero-crossing
algorithm.
3.2.4.
Overload Handling
If analog or digital overload occurs in one or more samples during an
interval period, the interval value of that interval period is tagged with an
overload flag. Similarly, if analog or digital overload occurs in one or
more samples during recording of a transient, the corresponding transient
will be tagged with an overload flag. In this way INFRA Net can indicate
possible overload in its interval and transient data reports.
Overload is indicated in the display with a “>” before the value.