5-17
VIBXPER
T II 05.2012
Measurement tasks
The signals of both sensors are displayed either as individual signals
or as an orbit in a polar chart. The maximum and minimum phase
vectors and the order filter are displayed in the data field on the orbit
display. The angular coordinate of the cursor indicates the angular
distance to Keyphaser point*, which is marked in the orbit with an
arrow. To check the phase stability, multiple rotations of the shaft can
be displayed in the orbit diagram (see p. 3-23).
Cursor and Zoom
A main and delta cursor are available for evaluation. Details of their
function and operation are described in the section 'Evaluate result
- Time signal' on page 4-5. The Zoom function is controlled with the
'+/-' key or with the navigation keys ('Phase measurement', P. 5-15)
Changing the diagram type
After the measurement,
• Press the F key, and click on 'Individual signals' or on 'Orbit' respec-
tively, or..
• Open the Display Setup and select the diagram type (see below).
Changing the order filter
After measurement, press the F key, and select the required order in
the 'Order' field. The order of '0' corresponds to the unfiltered signal
and can only be adjusted if the measurement parameters in the mea-
surement setup and the transducer setup are the same.
Orbit, unfiltered
If a keyphaser is not available, record an 'unfiltered' orbit. The angu-
lar displacement of the sensors for this measurement task must equal
90°! To stop the measurement, press the 'Enter' key.
For time-based average enter the shaft RPM value and the number of
rotations, if necessary: Press the MENU key and select 'Postprocessing
/ Timesynchronous average' (see also p. 4-7).
Left:
Change diagram type
Right:
Change order
* Keyphaser point: Point in the orbit, at
which the reference mark on the shaft
passes the Keyphaser.
Summary of Contents for VIBXPERT II
Page 175: ......
