Rockwell-automation 1441-DYN25-MFRF Frequency Response Function Extens Uživatelský manuál stáhnout pdf (Strana 25)

Rockwell Automation Publication 1441-UM003A-EN-P - May 2011 25

FRF Frequency Response Function Extension Module Chapter 2

The FRF - Taking Data screen shows frequency, magnitude, phase, and Q

factor (where appropriate) at the cursor position.

Field Calibration

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.

Indicates how many hits

were taken.

FRF Measurement

The FRF is colored red

where coherence falls

below 80%.

Good coherence shows the

trace in green.

Phase

Coherence for the

measurement, represented

by the color of the FRF

trace.

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