40
The Maximum length setting allows you to choose the maximum length of an event file. If
this limit is reached, the SB closes the file. If the SB is still triggered it will start recording a
new file. The maximum value is 1800 s.
Each channel (X, Y horizontal and Z vertical) has its own trigger threshold level that is set-up in the
section Level. If the vibration exceeds the threshold level on a specific channel, the trigger
condition becomes true for this channel.
In the section Combination you choose which channels are needed to fulfill the general trigger
condition and subsequently lead the instrument to start recording. You may consider only 1 axis
(=channel, e.g. Z vertical), or more. If you consider more than one Axis, you can decide if the
MR3000SB is triggered when all the axes are above the level, or just one of them. You choose it
with the AND/OR Logic. A common setting is to consider all 3 axes, and trigger when any of them
has reached the trigger level (“OR”).
The trigger level may be automatically adjusted to the actual level of vibration if you activate the
Trigger increment option. After each event or when the Maximum length of the recording is
reached (see above), the trigger level is increased by the amount given as Increment step. It is
decreased by the same amount after the period specified in Decrement Time has elapsed and no
further event has been recorded.
The trigger mode can be selected between Level and the STA/LTA.
In both cases, before applying the trigger mode, a band-pass trigger filter between 0.5 and 15 Hz
is applied on the signal. This means that en event is created only if both the conditions are fulfilled:
• the trigger condition is exceeded;
• the peak is associated to a frequency in the range 0.5 – 15 Hz.
In case of Level, the acceleration threshold for the trigger activation can be chosen on each of the
three axes.
NOTE: Due to the presence of the trigger filter, values exceeding the trigger threshold do
not necessarily lead to an event creation.
Figure 5.1.2. Trigger recording interface.
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