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

 

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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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