Frf Analysis Set-Up Parameters - Allen-Bradley Dynamix 2500 User Manual

Chapter 2 FRF Frequency Response Function Extension Module
20

FRF Analysis Set-up Parameters

This table describes the FRF set-up parameters.
Table 2 - FRF Analysis Set-up Parameters
Parameter Description
Acquisition Mode Set to Hammer for FRF acquisition and modal analysis,
or set to Continuous for ODS analysis.
If you are performing ODS analysis, refer to the
instructions that accompanied your ODS software for
additional information on settings that are required.
Hammer Units This setting does not restrict the Meas Units options, for
example, if Hammer Units is lbf, mobility can still be
measured in mm/s/N.
H.Sens Enter the sensitivity of the hammer.
Sensor Type Specifies the type of sensor used on Connector B, for
example, an accelerometer, velocity transducer, or
displacement probe.
ODS analysis requires a sensor on both Connector A and
B. The sensor type and sensitivity must match on both
channels.
Sens. Enter transducer sensitivity in mV per sensor unit.
Measurement Sets FRF display type.
Meas Units Measurement units change to correspond with the
measurement display type that has been chosen, but can
be set to Imperial or metric units.
Y-axis Sets Y axis to linear, logarithmic, or decibel scale.
Hammer Range Sets the hammer input range manually to selected fixed
range, or to be set automatically.
Response Range Sets response sensor input range manually to selected
fixed range, or to be set automatically.
If Hammer Range or Response Range is set to
Automatic, you are prompted to make three trial hits to
establish the range to use.
Freq Range Sets the frequency range for the test. The Acquisition
time information box changes accordingly.
Rockwell Automation Publication 1441-UM003A-EN-P - May 2011
Value/Comments
Hammer (default)
ODS analysis
N (metric default)
lbf (EU)
5.00 (default)
mV/N
Vlbf
Accel G (default)
2
m/s
in/s
mm/s
mils
um
100.00 (default)
mV/g
Mobility (default)
Apparent Mass
Accelerance
Impedance
Stiffness
Compliance
ips/N (default)
mm/s/N
ips/lbf
mm/s/lbf
Linear
Log (default)
dB
Automatic (default)
0.100...220000N
Automatic (default)
0.100...2000g
1000 (default)