PRÜFTECHNIK VIBXPERT II - Trigger Type; Level; Start

3-22
VIBXPERT II 05.2012
Options
Measurement setup for
- Runup/coastdown analysis (left)
- Orbit (right)
*'Fixed range', e.g. for a runup / coast-
down curve or impact test.
Tip: Carry out a test measurement
in order to determine the maximum
amplitude.
order (with phase, orBit, coastdown measurement)
Order filter for the harmonic vibration components of the signal.
For example, only the signal components of the 1st harmonic are
filtered out and displayed by the first order filter. A half order is
used for detecting oil whirls in machines with journal bearings.
pulse per rev. (with rpm measurement): Number of measurement marks
on the shaft or coupling.
measurement range (all viBration measurements): The measurement
range for the analog channel (A/B) can be automatically matched
to the input signal ('Auto') or set to fixed*. When set to ‘[Value] /
Auto-Up’, the measurement range is automatically increased when
the upper limit is exceeded.
low pass filter (phase, amplitude coast-down - phase): To suppress high
frequencynoisesignals,alowpasslter(1kHz)canbeactivated
(Yes).Inacoastdownmeasurementthelowpasslters(1kHz/
10kHz)aresetautomaticallyasafunctionofthestartandstop
speeds. With 'No', the signal is processed without a low pass filter.
window / numBer of lines (impact test): The standard window function
for the impact test with an impulse hammer is the rectangular win-
dow;allotherparametersaredescribedinsectionA2.
negative averaging (impact test): Enables an impact test while the ma-
chine is running (1 channel and 2 channels with impulse hammer).
The signals from the running machine are filtered out.
frf calculation (2-ch impact test): Calculation procedure for the trans-
fer function - (Frequency Response Function = FRF).
trigger type / level / start
(
shock pulse, viBration overall value, user ac, impact test)
 Level:Themeasurementstartsassoonasthesignalhasexceeded
theselectedtriggerlevel(in%ofthemax.meas.range).Signal
recording can be started before or after the trigger event via the
Trigger start time.