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Table 72 - High-level Signal Processing Considerations (continued)
High-level Signal Processing Considerations
Page
Parameter
Overall
Detection
Time Constant
Tracking Filters
Tracking Filters provide accurate order measurement and it is recommended that they
be used, vs. FFT Band measurements, when real-time measures are required or if speed
is not stable.
See
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Considerations
Select RMS or Scaled Peak signal detection.
RMS-based level detection verifies the most accurate
measurement possible.
If True Peak or True Peak to Peak signal detection is
required, then make sure that the signal of interest is at a
frequency not greater than 30% of the selected FMAX. If
True Peak or True Peak to Peak signal detection is required,
then make sure that the signal of interest is at a frequency
not greater than 30% of the selected FMAX. This action
makes sure that the sampled TWF accurately represents
the input signal.
For the best accuracy set the Overall Time Constant to 1.0.
However, in addition to accuracy, the TC affects the
sensitivity and responsiveness of the overall
measurement. See
further information.
Tracking Filters on page 138
for details and guidance on defining Tracking Filters.
Operate the Module
Chapter 10
Overall Time Constant on page 133
for
295
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