Delphi Multec 3.5 Applications Manual page 90

System Interface
4-6
5. Data can be compared if they are presented in the format typically
used at Delphi. RPM spectral maps and power spectra are needed.
Use the following parameters for analyzing the data:
• Hanning window
• Narrow band analysis
• Frequency band from 20-2500 Hz
• Stable averaging and peak hold averaging for a minimum of 50
events
• Overall RMS Level in a 20-2500 Hz frequency band
• Identification of peak frequencies and level
• Display graphs in Power Spectral Density (PSD in g^2/Hz) vs.
Frequency (linear frequency axis and both log and linear axis for
amplitudes).
This procedure should be performed for each operating condition and
axis. Figure 4-3 shows an example of how the data should be
presented for steady state rpm conditions. Figure 4-4 shows a typical
spectral map.
Multec 3.5 Fuel Injector Application Manual
Delphi Energy and Chassis Systems
Revision: 11/05-1