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FRF Measurement
Coherence for the
measurement, represented
by the color of the FRF
trace.
Field Calibration
The FRF - Taking Data screen shows frequency, magnitude, phase, and Q
factor (where appropriate) at the cursor position.
Phase
Data can be checked for calibration and integrity by carrying out a test on a
known mass, for example, a calibration weight or steel bar of a measured value.
Use a calibration weight of 1kg or any other known mass.
Figure 2 - Field Calibration Setup
This is an example of a set-up for Field Calibration.
1. Fit the correct tip to the modally tuned hammer.
Rockwell Automation Publication 1441-UM003A-EN-P - May 2011
FRF Frequency Response Function Extension Module
The FRF is colored red
where coherence falls
below 80%.
Good coherence shows the
trace in green.
Indicates how many hits
were taken.
32160-M
Chapter 2
25
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