FAG Detector III User Manual page 85

Frequency settings
In this section you can set the start and end velocity for Determining the
resonance range of a machine
Use automatic start frequency: Enter the frequency at which the Detector
starts measuring.
Use automatic end frequency: Enter the frequency at which the Detector stops
measuring.
Expert settings
The settings in this section concern conditioning of the measuring signal
determined while Determining the resonance range of a machine
up/coast down test.
Order: Select what signal order the Detector should determine (1 = rotational
speed signal, 2 = 1st harmonic, 3 = 2nd harmonic, 4 = 3rd harmonic).
Signal length: Enter how many samples (1024, 2048 or 4096) the Detector
should measure per measuring signal.
Use Hanning windowing: Select whether the Detector should use Hanning
windowing when conditioning the measuring signal. Hanning windowing leads
to better quality of the digitized measuring signal, particularly at low rotational
speeds. However, this additional step requires computing time in the Detector
and leads to increased noise in the digitized signal.
The effects of this setting depend very much on the type of machine
and on the individual demands on the ratio of accuracy to the
numb er of signal support points. As a general rule, you should
measure as many amplitude and phase values as possib le for
machines that run up/coast down quickly - i.e. reduce signal
length and thus signal quality and do without Hanning
windowing,
increase accuracy for machines that run up/coast down slowly, i.
e. increase signal length and thus signal quality and activate
Hanning windowing.
Measuring data
In the Measured data window you can
create an amplitude/phase diagram for a set of measured data,
save frequency bands selected in the diagram and copy them to a balancing
configuration
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with the run up/coast down test.
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.
Trendline 3
with the run
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85