UTD1000 User Manual
Table 2-17 FFT function window
Most Suitable Measurement Item
Sine, cyclical and narrow-band random noise.
Temporary or fast pulse. Signal level varies greatly
before and after.
Mainly for single-frequency signals to search for
higher-order harmonic wave.
Temporary or fast pulse. Signal level is generally
the same before and after. Equal sine wave of very
similar frequency. There is broad-band random
noise with slow moving wave spectrum.
Feature
Frequency recognition rate is better than
the rectangle window, but amplitude
recognition rate is poorer.
Frequency recognition rate is marginally
better than Hanning window.
The best amplitude recognition rate and
the poorest frequency recognition rate.
The best frequency recognition rate,
the worst amplitude recognition rate.
Basically similar to a status without
adding window.
FFT Window
Hanning
Hamming
Blackman
Rectangle
Definition :
FFT recognition rate : It means the quotient of the sampling and math points. When maths point value is fixed, the
sampling rate should be as low as possible.
Nyquist frequency : To rebuild the original waveform, at least 2f sampling rate should be used for waveform with a
maximum frequency of f. This is known as Nyquist stability criterion, where f is the Nyquist frequency and 2f is the
Nyquist sampling rate.
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