Basic FAQ for FFT Analyzers Common to All Models
analysis conditions
- What is the relationship between frequency range and sampling frequency?
- What is a time window in FFT?
- What is the relationship between time window length and the number of sampling points?
- What is leakage error?
- What kinds of time window functions are there, and how are they distinguished in 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 back)?
- What is an anti-aliasing filter?
- What are the differences between AC and DC in input coupling, and how should they be used differently?
- The frequency characteristics of AC coupling are
- What is CCLD?
- What is TEDS?
- How are audio filters (A characteristic, C characteristic) 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 do they differ from the power spectrum?
- What is the EU calibration function?
- I want to read the acceleration signal directly as acceleration values.
- I want to directly read the voltage signals from the sound level meter and microphone in dB (sound pressure level, Lp).
- What is the method to convert acceleration values from an accelerometer into speed or displacement?
- I want to evaluate in dBm. What are the settings for the calibration value?
- When using the integration function on acceleration data to determine displacement and conducting tracking analysis, the MAXOrd value is displayed as larger than the O.A. (Overall) value. Why is that?
- What is the 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 using the peak value (or peak-to-peak value).
- What is the overall value, and how is it calculated?