Page 25 - Shock and Vibration Overview
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Equipment Setup
press the accelerometer to the structure by hand. This obviously drastically reduces
the measurable frequency range to less than 100 Hz or so. Because humans can’t
remain perfectly still either, they are not recommended for frequency ranges less
than 10 Hz.
Wiring
One of the biggest pains of vibration measurement is typically how to deal with wiring.
Wiring can sometimes require modifications to the test environment to accommodate
the wiring from sensors to DAQ systems to a power source. This can limit where testing
occurs and can sometimes require special “test samples” that are systems specifically
designed for testing, not field use. Often test data is required on site, on a fielded unit,
not a glorified laboratory!
Figure 13: Wiring is often a necessary evil in vibration testing; but it can create a headache for
the engineer.
Wiring also can introduce mechanical, electrical, and electromagnetic noise so great
care should be taken to mitigate the chances of the wiring introducing such noise.
Generally a reduced cable length offers the best practice of minimizing unwanted noise
and is where a high quality vibration data logger offers unique benefits.
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