PRÜFTECHNIK VIBXPERT II, Operating Instructions Manual

Page: 73 / 176

3-23
VIBXPER
T II 05.2012
Options
Left:
Keyphaser mark in the orbit remains
stable over multiple rotations.
Right:
Setup for envelope spectrum
Acceleration - low speed
s
tart
/ s
top
rpm (r
unup
/ c
oastdown
): Rotational speed at which the
measurement should start or stop.
rpm
deviation
(r
unup
/c
oastdown
): 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
(p
hase
- c
ross
c
hannel
): Maximum RPM range for calculat-
ing the phase correlation.
s
ensor angle
(o
rBit
): The angle between the two sensors can be freely
selected between 5° and 175°.
d
isplayed turns
(o
rBit
): 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
m
easurement quantity
: see section A1 - 'Overall values' (prev. page).
f
ilter
t
ype
(e
nvelope
): Software / Hardware; envelope calculation us-
ing a software algorithm or via a hardware module.
hp/lp f
ilter
(e
nvelope
)
36-36 kHz; 1-40/ 20/ 10/ 5/ 2,5 kHz (hardware filter)
0.5 / 2.5 / 5 / 10 / 20 / 40 kHz (lowpass (LP) software filter)
Highpass (HP) software filter from 100Hz to TP, freely adjustable
d
emodulation factor
(e
nvelope
): Ratio of the highpass frequency prior
to demodulation to the lowpass frequency after demodulation.
l
ower
/ u
pper
f
requency
(
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