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3.2.2 Transient data
The V1x Geophone records transient data after a trigger event. The
trigger event happens when any of the following is valid:
The vibration level becomes larger than the threshold level
(threshold must be active).
Another sensor connected to the same Datalogger triggers.
The operator of the Datalogger triggers manually.
The transient data is anti-alias filtered, but not further filtered
digitally. Instead, it is possible to apply any of the available standards
on the recorded transient in INFRA Net. Pre-trig is always 1 second,
and recording post-trig length is adjustable between 1 and 40 seconds.
Recording limitations:
The transient memory in V1x has a length of 42 seconds. If
the recording length is set longer than 20 seconds, each
recorded transient must be transferred to the Datalogger
before a new transient can be recorded. When the recording
length is maximum 20 s, the transient memory is split into
two or more transient files. This enables more than one
transient file to be recorded, without latency, before the V1x-
memory becomes temporarily full.
Transfer capabilities to the Datalogger are set to enable long
cables and low power consumption. Approximately 0.3 - 0.6
s of vibration level data are transferred per second. This
means for example that if you have set transient files to 40
seconds, there must be at least 70 seconds between the
transients for V10 and V11, and 3.5 minutes between the
transients for V12. Otherwise cannot transients be recorded
because the memory is occupied by the previous transient
(which is being transferred to the Datalogger).
NOTE! The transfer times above is
per sensor
which means
that you must multiply the times with the number of sensors
connected to the same Datalogger. A solution to this
limitation is to use more than one Datalogger.
