Owon TAO3000 Series User Manual page 91

Hori (Hz)
Display
Vertical
FFT Peak
The FFT (fast Fourier transform) math function mathematically converts a
time-domain waveform into its frequency components. It is very useful for
analyzing the input signal on Oscilloscope. You can match these frequencies
with known system frequencies, such as system clocks, oscillators, or power
supplies.
FFT function in this oscilloscope transforms 8192 data points of the
time-domain signal into its frequency components mathematically (the record
length should be 10K or above). The final frequency contains 4096 points
ranging from 0Hz to Nyquist frequency.
Taking the FFT operation for example, the operation steps are as follows:
1. Click to call up the menu panel. Click the FFT softkey on panel to
switch to the ON state and display the FFT menu on the bottom. The pink
M waveform appears on the screen.
2. In the bottom menu, select Source. In the right menu, select CH1.
3. In the bottom menu, select Window. In the right menu, select the proper
window type.
4. In the bottom menu, select Format. In the right menu, select amplitude unit
(V RMS, Decibels) or phase unit (Radian, Degrees).
5. In the bottom menu, select Display. In the right menu, select Hori (Hz);
select repeatedly to make the
value (the upper one), click
FFT waveform; then select to make the
value below, click
6. Select Vertical in the right menu; do the same operations as above to set
the vertical position and vertical division.
To select the FFT window
■ There are 6 FFT windows. Each one has trade-offs between frequency
resolution and magnitude accuracy. What you want to measure and your
source signal characteristics help you to determine which window to use. Use
4.Advanced User Guidebook
Position value
Switch to select the horizontal position
or time base of the FFT waveform, click
Time base
value/
Position value
Switch to select the vertical position or
voltage division of the FFT waveform,
Division value/
click
Enable or disable FFT peak search.
ON
Dynamic marker ▽ marks the FFT
OFF
peak.
symbol in front of the horizontal position
or
or to adjust the time base of FFT waveform.
85
or to adjust it.
or to adjust it.
to adjust the horizontal position of
symbol in front of the time base