Spider DSA User’s Manual
288
Delta RPM: The Delta RPM defines the resolution of the RPM trace or the
resolution of the RPM axis for Order tracks and Band RMS Spectra. The smaller
the delta RPM, the more frequently the signals will be stored and displayed along
the RPM axis and the more storage that will be required. Typically, the Delta RPM
is chosen between 25 and 100 RPM.
Max Order: The Max Order defines the highest order number for an Order
Spectrum. This is similar to defining the maximum frequency in an FFT analysis.
EDM uses this value to determine the analysis frequency range. You should define
the minimum Max Order that the application needs. If the Max Order too high,
the system must sample at a very high frequency to cover the whole frequency
range and the accuracy of lower order estimations may be poor.
Delta Order: The delta Order defines the resolution of an Order Spectrum. The
Max Order and Delta Order together define the number of points in a normalized
order spectrum. The smaller the value of Delta Order, the better will be the
resolution and more computational resources are required to process the order
spectra.
The Order Analysis parameters can also be viewed or edited on the control panel
(when the test is not in the running). This enabled the users to quickly access and
modify the Order Analysis parameters which are the most important parameters
for an Order Tracking test.
FFT Analysis Parameters Setup
As mentioned in the previous section, it is frequently important to measure the
FFT Spectrum alongside the Order spectrum during an Order Analysis. FFT
parameters can be modified by navigating to the Test Configuration, by either
clicking on “Config” from control panel or clicking on “Test Configuration” from
the “Setup” menu item.
The frequency range and other FFT parameters are usually determined using the
max order and the max RPM of the order analysis settings. Some key parameters
can be changed by the user to enable the FFT spectrum as per the user’s choice.
Frequency Range is defined as the maximum frequency range for the FFT
analysis. Frequency range determines the sampling rate required. A minimum
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