FFT Analyzer Basic FAQ (Applicable to all models)
Analysis conditions
- What is the relationship between frequency range and sampling frequency?
- What is the time window in FFT?
- What is the relationship between the time window length and the number of sampling points?
- What is leakage error?
- What types of time window functions are there, and how do you choose which one to use?
- What is a trigger, and what are its uses?
- How is frequency resolution determined?
Input section
- What are sampling and sampling frequency?
- What is aliasing (folding)?
- What is an anti-aliasing filter?
- What is the difference between AC and DC input coupling, and how should they be used differently?
- The frequency characteristics of AC coupling are
- What is CCLD?
- What is TEDS?
- How are acoustic filters (A-weighting, C-weighting) used?
- What is the relationship between the time constant and the cutoff frequency of a low-pass filter?
Spectrum-related
- What is a spectrum?
- How is the average of a spectrum calculated?
- What is real-time analysis?
- What is overlap processing?
- What are PSD and ESD, and how are they different from power spectrum?
- What is the EU calibration function?
- I want to directly read the acceleration signal as an acceleration value.
- I want to directly read the voltage signal from a sound level meter or microphone in dB (sound pressure level, Lp).
- How can acceleration values from Accelerometer be converted into velocity and displacement?
- I want to evaluate in dBm. How do I set calibration values?
- When using integration to calculate displacement from acceleration data and performing tracking analysis, the MAXOrd value is displayed as larger than the OA (overall) value. Why is this?
- What is a Fourier spectrum?
- What is phase?
- What is the effective value?
- What is signal power?
- What is a power spectrum?
- What do the dB values on the vertical axis (Y-axis) of the power spectrum represent?
- I want to read the spectral value of a line at a certain frequency as the peak value (or PP value).
- What is the overall value, and how is it calculated?