3-22
VIBXPERT 11.2010
Options
Measurement setup for
- Runup/coastdown analysis (left)
- Orbit (right)
*'Fixed range', e.g. for a runup /
coastdown curve or impact test.
Tip: Carry out a test measurement in
order to determine the maximum
amplitude.
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.
L
OW PASS FILTER (AMPLITUDE COAST-DOWN - PHASE): The low pass filter can
be set automatically as a function of the start and stop speeds
(‘Yes’ option). ‘No’ is used if the low pass filter is not used.
W
INDOW / NUMBER OF LINES (IMPACT TEST): The standard window function
for the impact test with an impulse hammer is the rectangular
window; all other parameters are described in section A2.
N
EGATIVE AVERAGING (IMPACT TEST): Enables an impact test while the
machine 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
transfer function - (Frequency Response Function = FRF).
T
RIGGER 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 threshold (in % of the max. meas. range).
Signal recording can be started before or after the trigger event via
the Trigger start time.
S
TART / STOP SPEED (RUNUP / COASTDOWN): RPM at which the measure-
ment should start or stop.
RPM
DEVIATION (RUNUP/COASTDOWN): Storage condition for the mea-
surement values. The current, averaged measurement value is not
saved until the rpm has changed by the value set here (p. 5-11).
RPM
RANGE (PHASE - CROSS CHANNEL): Maximum RPM range for calcu-
lating the phase correlation.
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