Allen-Bradley 1440-SDM02-01RA, User Manual, Page: 72 / 168

72 Rockwell Automation Publication 1440-UM001D-EN-P - September 2016
Chapter 2 Configure the XM-124 Standard Dynamic Measurement Module
Spectrum/Waveform Measurement Options
The Spectrum/Waveform Measurement options apply to the Standard,
Alternating gSE, Tracking Filter, Band Pass Filter, and Thrust Position
measurement modes. These settings affect the standard FFT and TWF
measurements. Click Spectrum/Waveform to open the Spectrum/Waveform
options dialog box.
Table 10 - Spectrum/Waveform Measurement parameters
In this field Values are Comments
Sampling Mode Choose the sampling mode:
• Asynchronous
• Synchronous with tach The sampling mode determines whether the signal is
synchronized with the tachometer signal and has several
effects on the resulting measurements.
Synchronous sampling requires a tachometer signal.
Sampling Mode (continued)
Frequency Type The frequency units (Hz or CPM). Enter the FMAX in these units.
Asynchronous Sampling Synchronous Sampling
The waveform measurement is
time-based
The waveform measurement is
position-based.
The spectrum measurement is
frequency-based.
The spectrum measurement is
order-based and the Number of
Lines must be evenly divisible
by Frequency Maximum.
The Frequency Maximum must
be specified in Hz.
Frequency Maximum must be
specified in orders.