BISOPE series
28- FFT Basic Glossary - Vibration Settings
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Whether in a conversation or a book, if the terminology
used does not agree with each other, it can lead to a completely different
understanding and thus a different result. In fact, instrument manufacturers,
including Korea, often use different terms because they are in different
countries and have slightly different technical scopes. Therefore, those who
want to acquire that knowledge will know the difference between the terms only after they have
used many materials or many types of instruments. Here, basic terms and
common sense that need to be organized during conversations to share knowledge
with measurement engineers when using FFT vibration measuring instruments or
vibration and noise related software are briefly summarized. (continue to be
updated upon request)
Vibration and Noise Measurement Terms:
Window, Peak Hold, Trigger, Order, Leakage, Aliasing
|
Terms |
Meaning |
|
Leakage |
Leakage, errors resulting from the inconsistency of the start
and end points of blocks when acquiring signals in block size (errors and
negative signals in amplitude and frequency on the spectrum) |
|
Window |
A function that converges the start and end points of a block to
the reference point (0) by multiplying a virtual signal (window function) to
minimize leakage errors |
|
Averaging |
There are methods such as acquisition of signals multiple times
and averaging, arithmetic average, and exponential average. It is used for
removing noise when measuring irregular signals. Among these types,
Synchronous Averaging means averaging only the order.) |
|
|
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BISOPE , vs72@naver.com, 070-4388-0415, www.kCBM.kr
