PRÜFTECHNIK VIBXPERT II, Руководство по эксплуатации

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3-22
VIBXPER
T 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.
o
rder
(
with
p
hase
, o
rBit
, c
oastdown 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.
p
ulse per rev
. (
with
rpm
measurement
): Number of measurement marks
on the shaft or coupling.
m
easurement 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.
l
ow pass filter
(p
hase
, a
mplitude
c
oast
-
down
- p
hase
): To suppress high
frequency noise signals, a low pass filter (1 kHz) can be activated
(Yes). In a coastdown measurement the low pass filters (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.
w
indow
/ n
umBer of lines
(i
mpact 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.
n
egative
a
veraging
(i
mpact
t
est
): 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).
t
rigger type
/
level
/
start
( s
hock
p
ulse
, v
iBration overall
v
alue
, u
ser
ac, i
mpact
t
est
)
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.