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Mains Power
Connector
Block
2710'<
f
Fig.3.6. Type 4801 Exciter Body Mains Power Connector block
whenever the test is force-related. As examples, the single exciter fatigue
testing of materials-test sample bars usually requires constant force, al-
though the bar is deteriorating during the test. Also, when using more than
one exciter to determine the resonant mode of a structure, censtant forces of
known phase and magnitude which are insensitive to changes in the struct-
ures are required.
The "Low" impedance mode keeps the voltage applied to the exciter
independent of test object changes. The "Low" impedance mode provides
the best acceleration waveform and is therefore preferable for most single
exciter applications. "Low" impedance mode operation is useful for
17
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