Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector - Manual (Page 292)

292 Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012
Chapter 11 FRF Frequency Response Function Extension Module
FRF Analysis Set-up Parameters
This table describes the FRF set-up parameters.
Table 54 - 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)