UNI-T UPO2102 User Manual page 100

User's Manual
a. Rectangle: It has the best frequency resolution and the worst amplitude resolution, which is
similar to the one with no window. It is suitable for measuring the following waveforms:
Transient or short pulse, the signal level is almost equal to before and after.
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Equal amplitude sine wave with very similar frequency.
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Wide-band random noise in a slowly changing spectrum.
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b. Hanning: Compared with the rectangle window, it has better frequency resolution, but poorer
amplitude resolution. It is suitable for measuring sine, periodic and narrow-band random noise
waveforms.
c. Hamming: The frequency resolution is slightly better than that of Hanning window. It is suitable for
measuring transient or short pulse, and the waveform with great difference before and after the
signal level.
d. Blackman: It has the best amplitude resolution, and the worst frequency resolution. It is suitable
for measuring the single frequency signals or seeking higher harmonics.
(5) Display Mode
It can set to full screen, split screen and waterfall curve for observing spectrum figure.
a. Split screen: Display the source waveform and the waveform of FFT spectrum waveform in split
screen, and extend display the spectrum. As shown in Figure 15-1.
b. Full screen: Superimposed display the source waveform and the FFT spectrum waveform in full
screen. User can observe the spectrum more clearly and make more accurate measurements.
c. Waterfall curve 1: Spectrum, waterfall curve and waveform are separately display in 3 window.
Waterfall curve shows the time changing of dB value in spectrum. It has "record" function. Waterfall
curve can only select when enhance FFT is opened. The maximum record 200 spectrum which
corresponds to waterfall curve.
d. Waterfall curve 2: Spectrum and waterfall curve split to two window to display. Waterfall curve
shows the time changing of dB value in spectrum. It has "record" function. Waterfall curve can only
select when enhance FFT is opened. The maximum record 200 spectrum which corresponds to
waterfall curve. As shown in Figure 15-2.
Chip selection: In STOP state, use Multipurpose knob or keypad to input fragment. For observing
the spectrum waveform in a time point on waterfall curve.
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