SPM leonova emerald, Руководство пользователя

Страница: 144 / 170

E
E:22
Vibration measurement
With ‘Measuring point data’ you can edit the meas-
uring parameters. Open with SHIFT+F3 and mark the
lines in the configuration window one by one with the
UP/DOWN keys. Open them with F1, ‘Edit’.
Variable speed
The alternative ‘Variable speed’ (1) implies that the
vibration measurement is preceded by a measurement
of the rpm. HD Order Tracking is always on when
measuring HD ENV.
Measure RPM simultaneously
‘Measure RPM simultaneously’ (2) is normally not used.
With this setting on, you are forced to measure the rpm
simultaneously with the vibration measurement. This must
be activated when using ‘Time synchronous averaging’.
Frequency, upper (Orders)
The frequency range is defined by selecting an upper
limit in orders (3).
Please note that correct measurements with the higher
BP and HP filters an SLD144, or similar, must be used.
You can exceed the upper frequency range of the
transducer when measuring an envelope spectrum.
Number of spectrum lines
The number of spectrum lines (4) affects the resolu -
tion and the measuring time. Doubling the number of
lines also doubles the measuring time. In cases where
different fault symptoms, such as bearing frequencies
and multiples of 1X, are close together, a high resolu-
tion spectrum is preferred.
Symptom enhancement factor
The ‘Symptom enhancement factor’ (5) is used to
improve the signal-to-noise ratio. For applications
with little electronic noise and few mechanical shock
phenomena, this factor can be kept low (0 - 5). Where
noise and random shocks are frequently occurring, it is
recommended that the ‘Symptom enhancement factor’
is set to 5 -10. However, you should be aware that the
higher this factor, the longer the measurement cycle.
The Y axis unit in spectrum is HDeuE (HD enveloping
units Enhanced) and in time signal is HD
2 euE when a
symptom enhancement factor is used.
Acquisition time
The acquisition time (6) is automatically updated when
the parassmeters that affect the time changes.
Defining the assignment
1
3
4
2
6
4
5
5