BISOPE series 66 How to set the appropriate frequency for measurement S...

BISOPE series 66- How to set the appropriate frequency for measurement (Setting the maximum frequency for vibration measurement)

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If you measure vibration using an FFT vibration meter, there are many things to consider in advance compared to measuring other physical quantities (temperature, displacement, pressure, etc.). Above all, the most difficult question at first is “How many Hz should I set?” However, if you have a simple vibration meter, you don’t have to worry much. This is because general vibration meters cannot perform FFT processing (they only use the time waveform without frequency setting itself and use the appropriate filtering to cut out the area that can be measured). However, FFT meters are different. If you set the frequency incorrectly, you may not be able to see the desired signal at all, and since it is a fundamental problem, it can be difficult.

 

Frequency setting (maximum frequency Fmax and sampling frequency)

 

When setting the frequency for vibration measurement, you basically set the maximum frequency (Fmax). This means the highest frequency on the horizontal axis of the spectrum graph. In the past, advanced FFT types expressed this as sampling frequency (sampling rate), which is usually twice the Fmax in vibration measuring instruments. To be exact, it is 2.56 times, but it is set to 2 times. Therefore, if you ask about the sampling frequency, you can divide the maximum frequency by 2. However, it is not important to enter the setting value, but to think in advance about, for example, 'What can I see if I set Fmax to 1000 Hz?'. See below.

 

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