Dynamix UM-S User Manual download pdf (Page 15)

Rockwell Automation Publication 1441-UM003A-EN-P - May 2011 15

Chapter

FRF Frequency Response Function Extension

Module

The Frequency Response Function (FRF) extension module is an optional

module for the Dynamix 2500 data collector. You install the extension module

with the FRF Frequency Response Secure Digital (SD) storage card.

See Install an Extension Module

on page 8 for installation instructions.

The Dynamix 2500 data collector FRF extension module lets you determine the

natural frequencies of a machine or structure in a more sophisticated manner

than the Bump Test module. Rather than simply detecting the frequencies where

resonances occur, it captures information about the frequency response of the

structure being tested.

• You can use the FRF data in conjunction with a modal analysis software

package to model the way the structure reacts to forces applied to it.

• You can use the FRF module to capture information about how a machine

moves when it is running. You can use this information with the Operation

Deflection Shape (ODS) analysis software.

The FRF module includes the following features:

• Simple selection of measurement type from a list of predefined options, for

example, mobility, stiffness, and apparent mass.

• FRF trace colored green or red to illustrate high or low coherence.

• Optional automatic parameter setting for input ranges, number of lines,

and windowing.

• Compatibility with ODS analysis software.

Topic Page

Newton’s Law and Apparent Mass 16

Setting Up an FRF Measurement 16

FRF Module Setup 18

Collect FRF Data 22

Field Calibration 25

Saving, Reviewing, and Deleting FRF Measurements 27

IMPORTANT

The FRF extension module is for Offroute/unscheduled measurements

only. The Emonitor software does not import this type of data.

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Dynamix UM-S User Manual Page 15