PRÜFTECHNIK VIBXPERT II - A2. Measurement Tasks in the Signals Tab

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VIBXPERT II 05.2012
Options
Left:
Keyphaser mark in the orbit remains
stable over multiple rotations.
Right:
Setup for envelope spectrum
Acceleration - low speed
start / stop rpm (runup / coastdown): Rotational speed at which the
measurement should start or stop.
rpm deviation (runup/coastdown): The current, averaged measure-
ment value is not saved until the rpm has changed by the value set
here(seep.5-11).
rpm range (phase - cross channel): Maximum RPM range for calculat-
ing the phase correlation.
sensor angle (orBit): The angle between the two sensors can be freely
selectedbetween5°and175°.
displayed turns (orBit): The time waveform can be displayed over
multiple rotations* to check the phase stability. When the phase is
stable, the keyphaser mark in the orbit remains constant.
A2. Measurement tasks in the 'Signals' tab
measurement quantity: see section A1 - 'Overall values' (prev. page).
filter type (envelope):Software/Hardware;envelopecalculationus-
ing a software algorithm or via a hardware module.
hp/lp filter (envelope)
 36-36kHz;1-40/20/10/5/2,5kHz(hardwarelter)
 0.5/2.5/5/10/20/40kHz(lowpass(LP)softwarelter)
 Highpass(HP)softwarelterfrom100HztoTP,freelyadjustable
demodulation factor (envelope): Ratio of the highpass frequency prior
to demodulation to the lowpass frequency after demodulation.
lower / upper frequency (f
min
/ f
max
): Lowest and highest frequency
which can appear in the signal. The lower frequency setting of
0.5Hzor1Hzonlyappliesforspectraandoverallvaluemeasure-
ments. For the 'Displacement' and 'User-defined' measurement
quantities, the DC component in the signal can be recorded (lower
frequency = DC).
For envelope spectra only the ‘upper frequency’ (f
max.
) is specified.
* up to max. number of averages