Spider DSA User’s Manual
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help to identify the resonance speed of a rotor or examine the rotor dynamics
on an order basis.
In the Spider-80X system, after the order tracks with phase are acquired, the
Bode Plot can show one or multiple tracks. Spider 80x system is also capable of
calculating phase plots to specifically measure the Run-up and Coast-down
conditions. A typical bode plot is shown below:
Figure 183: Typical Bode Plot
Operating Spider System
Crystal Instruments developed an enhanced Spider system with dedicated
tachometer channels and an enhanced hardware circuitry for measuring the
tachometer signal and performing order analysis. All Spider devices with
hardware versions 7.5 and above possess these special capabilities. It allows them
to perform Order Spectra, Order Tracks, FFT Spectra and Band RMS Spectra
simultaneously.
Older Spider modules (7.4 and back) developed without the dedicated tachometer
channels can also be used to perform order tracking. One or two of the input
channels can be used as tachometer channels and one of them can be used as a
Reference tachometer channel to perform the order analysis functions.
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