(1) Select Window Function
UTD2000CEX-II series provides 4 kinds of common window functions:
Rectangle : The best frequency resolution and the worst amplitude
resolution are similar to the condition of no window , suitable for measuring
the following waveform:
a. Transient or short pulse, the signal level is approximately equal to the
before and after
b. Constant amplitude sine wave with similar frequency
c. random noise with slow broadband spectrum
Hanning：Compared with the rectangular window, it has better frequency
resolution, but less range. It is suitable for measuring sine, periodic and
narrow-band random noise.
Hamming：Slightly better in the frequency resolution than the Hanning
window, suitable for measuring transient or short pulse, large variance
of before and after signals.
Blackman：The best range resolution, the worst frequency resolution,
it can be used to measure the single frequency signal, to find higher
harmonics.
(2) Set Vertical Unit
Vertical units can be Vrms or dBVrms. Press F4 to select the desired unit.
Vrms and dBVrms show the vertical amplitude by means of logarithmic and
linear. To display the FFT spectrum in a larger dynamic range, dBVrms can
be used.
5.3 Digital Filter
Press MATH button, then press F1 to select digital filter to enter the menu.
Digital Filter Menu
Descriptions
Set filter to low pass
Set filter to high pass
Set filter to band pass
Only valid in high pass or
band pass; Use Multipurpose
knob to modify lower limit value
Only valid in low pass or band
pass; Use Multipurpose knob
to modify upper limit value
Set any one of the Ch1,
CH2 for digital filter source
Independently adjust the
position of the filtered waveform
Independently adjust the
position of the filtered waveform
Options
Digital Filter
Low Pass
High Pass
Band Pass
CH1, Ch2
Functions
Type
Filter Type
Frequency
Lower Limit
Frequency
Upper Limit
Source
vertical
displacement
Horizontal
displacement
UTD2000CEX-II User Manual
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