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3-2
Measurement
*Measurement quantity:
Vibration acceleration,
Vibration velocity
Vibration displacement as overall
value, time signal or spectrum respec-
tively
Shock pulse,
Temperature,
RPM,
...
What is a measurement task?
To carry out a measurement, VIBXPERT requires information on
the type of measurement quantity*, the sensor being used and, if
necessary, data for the evaluation of the result. Information as to
whether the RPM must be recorded with each measurement is also
required. This data set is designated as a 'measurement task' and
forms the basis for each measurement with VIBXPERT.
To simplify the preparation of a 'multimode' measurement and to
save the user from having to enter the required data, VIBXPERT
already contains a comprehensive collection of predefined
knowledge-based measurement tasks. The user is only allowed to
change the transducer and to alter the measurement channel in
these measurement tasks. If extensive changes to the measurement
parameters are required, it is better to create a new measurement
task.
In the 'Route' and 'Machine Template' operating modes, VIB XPERT
receives the measurement tasks directly from the OMNITREND PC
software. Only a few of the measurement parameters here can be
changed (transducer, measurement channel, RPM entry).
The following overview shows the structure of a measurement task
Measurement
quantity
(icon)
Overall velocity >600RPM
Measurement
tasks
Measurement
Velocity / 10-1000 Hz
setup
VIB 6.140
Sensor setup
Evaluation
ISO 10816-3 group 2
setup
RPM
RPM measurement
in VIBXPERT:
The measurement tasks are sorted according to measurement
quantity* and assigned a measurement icon in the selection
screen. If you are in the 'Multimode' operating mode for example,
all measurement tasks of the 'Vibration velocity - overall value'
measurement quantity appear under the icon shown above. The
letters 'a', 'v', and 'd' in the icon stand for 'Acceleration', 'Velocity' and
'Displacement'.
Overall velocity >120RPM
Velocity / 2-1000 Hz
VIB 6.142
ISO 10816-3 group 1
No measurement
..
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