Rockwell Automation 1440-SDM02-01RA XM-124 Standard Dynamic Measurement Module - Manuel (Page 69)

Rockwell Automation Publication 1440-UM001C-EN-P - May 2014 69
Configure the XM-124 Standard Dynamic Measurement Module Chapter 2
Frequency Maximum The maximum frequency or order for the spectrum measurement. The sampling mode determines whether the frequency
maximum is specified in Hz or orders. It also determines
whether you enter a value or choose a value from a list of
available values:
• If sampling mode is synchronous with tach, enter the
Frequency Maximum value. The frequency maximum
range for Synchronous sampling mode is 4…200 orders.
• If sampling mode is Asynchronous, choose the Frequency
Maximum value. Note you may enter a specific value if you
choose 10…5000 range. Supported maximum
asynchronous frequencies are dependent on sensitivity
units and full scale units you choose on the Channel tab.
See tables below.
When integrating, the Maximum Frequency may not be set
greater than the 2 kHz analog LPF that is applied to all
integrating measurements.
Number of Spectrum Lines Choose the number of lines (bins) in the spectrum measurement:
• 100
• 200
• 400
• 800
• 1600 This determines the frequency resolution of the spectrum
measurement.
Important: When sampling mode is Synchronous, the
Number of Spectrum Lines must be evenly divisible by the
Frequency Maximum value (no remainder).
Period Displays the total period of the waveform measurement in seconds.
Samples are accumulated into a time waveform of this duration before
an FFT is performed on the collected data. Period is provided to show the
effect various settings, such as Number of Spectrum Lines, have on the
update rate of measurements (Band and Vector) derived from the
spectrum.
The value is in seconds when sampling mode is set to
Asynchronous. The value is in cycles when sampling mode is
set to Synchronous.
Order of Sum Harmonics Choose the starting order for the sum harmonics measurement:
• 1
• 2
• 3
• 4
• 5 The amplitudes of all harmonics from the specified harmonic
through the Frequency Maximum are included in the sum.
Important: The sum harmonics measurement requires the
tachometer to be enabled (Pulses Per Revolution is set to 1 or
more), and a tachometer signal must be present.
In this field Values are Comments
Frequency A B
10…5000 X X
6250 X X
7500 X X
8000 X
9375 X X
10,000 X
12,500 X
15,000 X
18,750 X X
20,000 X
Full Scale Units (Channel tab)
mil
μm in/s
mm/s
g V
Psi
mbar
Sensitivity
Units (Channel
tab)
mil
μm
Column A
in/s
mm/s
Column A Column A
g Column B Column A
V Column A
Psi
mbar
Column A