Rockwell Automation 1441-DYN25-MFRF Frequency Response Function Extension Module for the Dynamix 2500 - Manual (Page 20)

20 Rockwell Automation Publication 1441-UM003A-EN-P - May 2011
Chapter 2 FRF Frequency Response Function Extension Module
FRF Analysis Set-up Parameters
This table describes the FRF set-up parameters.
Table 2 - FRF Analysis Set-up Parameters
Parameter Description Value/Comments
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 (default)
ODS analysis
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. N (metric default)
lbf (EU)
H.Sens Enter the sensitivity of the hammer. 5.00 (default)
mV/N
Vlbf
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. Accel G (default)
m/s
2
in/s
mm/s
mils
um
Sens. Enter transducer sensitivity in mV per sensor unit. 100.00 (default)
mV/g
Measurement Sets FRF display type. Mobility (default)
Apparent Mass
Accelerance
Impedance
Stiffness
Compliance
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. ips/N (default)
mm/s/N
ips/lbf
mm/s/lbf
Y-axis Sets Y axis to linear, logarithmic, or decibel scale. Linear
Log (default)
dB
Hammer Range Sets the hammer input range manually to selected fixed
range, or to be set automatically. Automatic (default)
0.100…220000N
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. Automatic (default)
0.100…2000g
Freq Range Sets the frequency range for the test. The Acquisition
time information box changes accordingly. 1000 (default)