When the hammer bounces . . .
Bouncing the hammer during an impact produces a bad measurement. If the measurements are
averaged into the modal data during the collection process, the overall modal survey will be in
question.
The following traces show the result of a single good hammer tap.
Time domain results of a
good hammer tap
Frequency domain results of a
good hammer tap
The following traces show the result of a multiple impact, such as when the
hammer bounces.
Time domain results of a
multiple impact
Frequency domain results of a
multiple impact
The Agilent 35670A’s preview feature allows you to manually or automatically
preview the response data from each test before adding it to the average. See
online help for more information on manual or timed preview modes.
Agilent 35670A
Operator's Guide Measuring Structures
2-17
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