CF-5200 Frequently Asked Questions
Question number FAQ-0547
The vibration waveform is being FFT analyzed in the 500Hz range, but it does not appear on the display. When the digital filter is turned off, it shows around 250Hz, but for some reason.
It can be judged that there are no signals below 500Hz.
The digital filter is an anti-aliasing filter (low-pass filter), and due to the effect of aliasing when OFF, the 750Hz component can be interpreted as appearing at 250Hz.
Always use it with the digital filter ON.
Generally, as you lower the frequency range from 100kHz, there is no oversight of signals in the higher frequency range.
If the data seems incorrect, please change the frequency range and voltage range and measure again.
Chapter of the relevant instruction manual
3.5 Anti-Aliasing Filter
Last updated: 2000-04-10