SV 258 PRO (AG) User Manual
42
When the criterion curve for a given type of building is used as the event trigger, the PPV and its dominant
frequency is compared against the curve. If the PPV value exceeds the curve limit, the event will start.
Reduction Factor
defines the multiplying factor for the criterion curve and can be in the range
: 0.1
÷ 1.9
. The
reduction factor allows to move the curve up or down, so the alarm can be started earlier or be postponed.
In case of the
User
standard and 1/3-octave
spectrum (
Octave 1/3 Vel.
or
Octave 1/3 Acc.
) if
Curve
is selected as a
Source
, two additional
positions
Condition 1
and
Condition 2
appear.
These positions allow you to set additional
conditions that must be met to trigger an event
which is based on comparing the RMS values
from two selected profiles.
►
After enabling the additional condition, you
should select
Result 1
and
Result 2
for the
profile:
RMS1
,
RMS2
,
RMS3
,
Rolling RMS1
,
Rolling RMS3
or
Rolling RMS3
.
►
The condition will be met when
Result 1
is
greater than
Result 2
.
After confirmation the selection with the
<ENTER>
key, this condition logic will be shown
in the field of this condition.
<ENT>
In the
Threshold
position(s) you can select the level(s) for
PPV
,
RMS
,
Roll. RMS
,
LEQ
or
Roll. LEQ
results.
If
Roll. RMS
or
Roll. LEQ
is selected, the
Rolling Time
position appears in which
you can set the timeframe for averaging the rolling result.
In the
Event Counter
position, you can select a
number of event conditions that should appear
before triggering the event and alarms.
You can set this position in the special screen
opened with the
►
key.
In the
Event Counter
screen, you can set also
the
Mode
of of counting events (
Periodical
or
Consecutive
).
►
In the
Periodical
mode, an event will occur if a trigger condition appears within a certain period of time (
Period:
Hum. Step
or
Vel. Step
) for a certain number of times (
Event Counter
).
In the
Consecutive
mode, an event will occur if a trigger condition appears the specified number of times (
Event
Counter
) consecutively in succession.
