Loading ...
Loading ...
Loading ...
84 / 99
(4) Window
Window function, it can select Hamming, Blackman, Rectangle and Hanning.
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.
Equal amplitude sine wave with very similar frequency.
Wide-band random noise in a slowly changing spectrum.
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, and 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-1, waterfall curve-1.
a. Split screen：Display the source waveform and the waveform of FFT frequency spectrum
waveform in split screen, and extend display the spectrum.
b. Full screen：Superimposed display the source waveform and the FFT frequency spectrum
waveform in full screen. User can observe the spectrum more clearly and make more accurate
measurements.
c. Waterfall curve-1：Waveform, frequency spectrum and waterfall curve are separate display in
3 window. dB value changes with the time in frequency spectrum display on waterfall curve. It
has record function.
d. Waterfall curve-2: frequency spectrum and waterfall curve are separate display in 2 window. It
has record function, as shown in Figure 14-1.
Segment Selection: In STOP state, use Multipurpose knob to select segment and view the
frequency spectrum which corresponding to a point in time on the waterfall curve, it can record
up to 200 the frequency spectrum which correspond to waterfall curve.
Figure 14-1
Loading ...
Loading ...
Loading ...